Comprehensive evaluation method and system for carbon emission based on concrete durability and strength

Abstract

This invention provides a comprehensive carbon emission evaluation method and system based on concrete durability and strength, belonging to the field of carbon emission evaluation technology. The method includes: determining the mix proportion and raw material data of the target concrete; calculating the carbon emissions per unit volume of the target concrete using a life cycle assessment method based on the mix proportion and raw material data; calculating multiple mechanical strength characteristic values ​​of the target concrete; calculating scenario-specific durability characteristic values ​​of the target concrete according to its application scenario; calculating a comprehensive carbon emission evaluation index for the target concrete using carbon emissions, mechanical strength characteristic values, and scenario-specific durability characteristic values; and comparing the comprehensive carbon emission evaluation index of the target concrete with that of a benchmark concrete to obtain the carbon emission evaluation result of the target concrete. This invention solves the problem that existing evaluation methods do not fully consider the impact of concrete durability on carbon emissions throughout its entire life cycle.

Description

Technical Field

[0001] This invention relates to the field of carbon emission assessment technology, and more specifically, to a comprehensive carbon emission assessment method and system based on concrete durability and strength. Background Technology

[0002] Currently, the assessment of concrete carbon emissions mainly focuses on the production or construction stage, often using carbon emissions per unit volume or per unit strength (such as compressive strength) as indicators. The former reflects greenhouse gas emissions per cubic meter of concrete during production, while the latter, by introducing strength parameters, preliminarily reflects the relationship between material properties and carbon emission efficiency.

[0003] However, existing technologies (especially the two indicators mentioned above) share a common major flaw: they do not fully consider the profound impact of concrete durability on its life-cycle carbon emissions. Concrete structures, especially shield tunnel segments, cross-sea bridges, and hydraulic structures, are designed for service lives of decades or even centuries. Insufficient durability leads to premature structural deterioration, increasing the frequency of maintenance, repair, and reconstruction. This triggers a new round of material production, transportation, and construction activities, generating significant "hidden carbon emissions." Conversely, durable concrete structures reduce maintenance and reconstruction needs, effectively reducing cement and concrete production, thereby significantly reducing life-cycle carbon emissions.

[0004] Therefore, neglecting durability in carbon emission assessment indicators may lead to biased or even misleading conclusions. A scientific and comprehensive carbon emission assessment system should effectively link and quantify the long-term environmental benefits (through durability) and short-term resource consumption (through carbon emissions) of materials. Currently, carbon emission indicators based on volume or strength are insufficient to meet the needs of accurate assessment and optimization of the carbon footprint of concrete throughout its entire life cycle, especially in major permanent engineering projects. The industry urgently needs a new type of carbon emission assessment indicator that can simultaneously consider the mechanical properties and long-term durability of concrete, driving material design, engineering selection, and construction technology towards "high strength, high durability, and low carbon emissions," thereby promoting the green and low-carbon transformation of civil engineering. Summary of the Invention

[0005] The purpose of this invention is to provide a comprehensive carbon emission evaluation method and system based on concrete durability and strength, in order to improve the aforementioned problems. To achieve the above objective, the technical solution adopted by this invention is as follows:

[0006] Firstly, this application provides a comprehensive carbon emission evaluation method based on concrete durability and strength, including:

[0007] Determine the mix proportions and raw material data for the target concrete;

[0008] Based on the mix proportions and raw material data of the target concrete, the carbon emissions per unit volume of the target concrete are calculated using the life cycle assessment method.

[0009] Calculate multiple mechanical strength characteristic values ​​of the target concrete;

[0010] Calculate the scenario-specific durability characteristic value of the target concrete based on its application scenario;

[0011] The comprehensive evaluation index of carbon emissions for the target concrete is calculated by considering carbon emissions, mechanical strength characteristics, and scenario-based durability characteristics.

[0012] The carbon emission evaluation results of the target concrete are obtained by comparing the comprehensive evaluation indicators of carbon emissions of the target concrete and the benchmark concrete.

[0013] Secondly, this application also provides a comprehensive carbon emission evaluation system based on concrete durability and strength, including:

[0014] The determination module is used to determine the mix proportions and raw material data of the target concrete;

[0015] The first calculation module is used to calculate the carbon emissions per unit volume of the target concrete based on the mix proportions and raw material data of the target concrete, using the life cycle assessment method.

[0016] The second calculation module is used to calculate multiple mechanical strength characteristic values ​​of the target concrete;

[0017] The third calculation module is used to calculate the scenario-based durability characteristic value of the target concrete according to the application scenario of the target concrete.

[0018] The fourth calculation module is used to calculate the comprehensive evaluation index of carbon emissions of the target concrete through carbon emissions, mechanical strength characteristic values ​​and scenario-based durability characteristic values;

[0019] The evaluation module is used to compare the comprehensive carbon emission evaluation indicators of the target concrete and the benchmark concrete to obtain the carbon emission evaluation results of the target concrete.

[0020] The beneficial effects of this invention are as follows: By simultaneously incorporating concrete mechanical strength and engineering-scenario-based durability into the carbon emission evaluation system, this invention proposes a comprehensive carbon emission evaluation index based on single and multiple durability indicators. This completely breaks through the limitations of traditional evaluations that only focus on the production / construction stage or only combine volume or a single strength indicator, extending the evaluation perspective from the short-term production stage to the entire life cycle of the structure. By modifying durability according to engineering scenarios, the carbon emission evaluation results are highly consistent with the actual service environment and stress state of concrete, effectively quantifying the environmental benefits brought by the long-term durability performance of concrete. This solves the industry pain point of traditional evaluations neglecting durability, leading to one-sided conclusions and misleading engineering selection, and achieves a scientific and accurate assessment of concrete carbon emissions.

[0021] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the carbon emission comprehensive evaluation method based on concrete durability and strength as described in the embodiments of the present invention;

[0024] Figure 2 This is a schematic diagram of the carbon emission comprehensive evaluation equipment based on concrete durability and strength as described in an embodiment of the present invention.

[0025] The diagram is labeled as follows: 800, Comprehensive carbon emission evaluation equipment based on concrete durability and strength; 801, Processor; 802, Memory; 803, Multimedia component; 804, I / O interface; 805, Communication component. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Example 1:

[0029] This embodiment provides a comprehensive evaluation method for carbon emissions based on concrete durability and strength.

[0030] It is understood that the method in this embodiment is applicable to scenarios such as cross-sea / near-sea engineering (e.g., shield tunnels, cross-sea bridges, port terminals), cold-region / freeze-thaw environment engineering (e.g., northern bridges, hydraulic dams, cold-region roads), and major permanent engineering (e.g., nuclear power facilities, high-rise buildings, long tunnels). For the same engineering scenario, raw material data, strength and durability test data with different mix proportions (e.g., different mineral admixture replacement rates, water-cement ratios, admixture types) can be input, and the optimal low-carbon mix proportion scheme can be selected by calculating the comprehensive carbon emission evaluation index.

[0031] See Figure 1 The figure shows that the method includes steps S1, S2, S3, S4, S5 and S6.

[0032] Step S1: Determine the mix proportions and raw material data for the target concrete;

[0033] Step S2: Based on the mix proportions and raw material data of the target concrete, calculate the carbon emissions per unit volume of the target concrete using the life cycle assessment method;

[0034] Step S2 includes:

[0035] Step S21: Based on the mix proportion and raw material data of the target concrete, extract the core parameters of each raw material in the unit volume of the target concrete. The core parameters include raw material usage, carbon emission factor, transportation data, production consumption data and curing consumption data.

[0036] Step S22: Calculate the carbon emissions during the raw material production stage using raw material usage and carbon emission factors;

[0037] In this step, the formula for calculating carbon emissions during the raw material production stage is:

[0038] ;

[0039] In the formula, This represents the carbon emissions per unit volume of target concrete during the raw material production stage, expressed in kgCO2eq / m³. 3 , Indicates the first The amount of each raw material used, Indicates the first The carbon emission factor of each raw material, expressed in kgCO2eq / kg.

[0040] Step S23: Calculate carbon emissions during the raw material transportation stage using raw material usage and transportation data;

[0041] In this step, the formula for calculating carbon emissions during the raw material transportation stage is:

[0042] ;

[0043] In the formula, This represents the carbon emissions per unit volume of target concrete during the raw material transportation stage, expressed in kgCO2eq / m³. 3 , Indicates the first The amount of each raw material used, Indicates the first The average transportation distance of the raw materials Indicates the first Carbon emission factor per unit mass of transport distance under various raw material transportation methods, expressed in kgCO2eq / (t·km).

[0044] Step S24: Calculate carbon emissions during the concrete production stage using production consumption data;

[0045] In this step, the formula for calculating carbon emissions during the concrete production stage is:

[0046] ;

[0047] In the formula, This indicates the carbon emissions per unit volume of target concrete during the production stage, expressed in kgCO2eq / m³. 3 , Indicates the consumption of the first Energy consumption Indicates the first Carbon emission factors of various energy sources Indicates the required man-days. This represents the average carbon emission factor of workers.

[0048] Step S25: Calculate carbon emissions during the concrete curing stage using curing consumption data;

[0049] In this step, the formula for calculating carbon emissions during the concrete curing stage is:

[0050] ;

[0051] In the formula, This indicates the carbon emissions per unit volume of target concrete during the curing stage, expressed in kgCO2eq / m³. 3 , Indicates the consumption of the first Energy consumption Indicates the first Carbon emission factors of various energy sources This indicates the water usage during the segment maintenance phase. This indicates the carbon emission factor of water.

[0052] Step S26: Calculate the carbon emissions per unit volume of the target concrete by considering the carbon emissions during the raw material production stage, the raw material transportation stage, the concrete production stage, and the concrete curing stage.

[0053] In this step, the carbon emissions per unit volume of the target concrete are:

[0054] ;

[0055] In the formula, This indicates the carbon emissions per unit volume of the target concrete. This represents the carbon emissions per unit volume of target concrete during the raw material production stage. This represents the carbon emissions per unit volume of target concrete during the raw material transportation stage. This indicates the carbon emissions per unit volume of target concrete during the production stage. This indicates the carbon emissions per unit volume of target concrete during the curing stage.

[0056] Step S3: Calculate multiple mechanical strength characteristic values ​​of the target concrete;

[0057] In this step, the mechanical strength characteristic value includes the compressive strength after 28 days of standard curing. Splitting tensile strength Flexural strength and axial compressive strength (All units are in MPa).

[0058] Step S3 includes:

[0059] Step S31: Prepare multiple standard test specimens of the target concrete according to the mix proportions of the target concrete;

[0060] Step S32: Perform standard curing on the standard test specimens;

[0061] In this step, all qualified standard test specimens are placed in a standard curing room for curing, with a curing cycle of 28 consecutive days.

[0062] Step S33: Select a mechanical testing machine with a matching range according to the strength design grade of the target concrete;

[0063] In this step, based on the target concrete's strength design grade (e.g., C60, C80), a mechanical testing machine with an indication error of no more than ±1% is selected, including a compression testing machine and an electro-hydraulic servo universal testing machine. The testing machine's range must match the estimated failure load (the estimated failure load is within 20% to 80% of the testing machine's range). Before the test, the mechanical testing machine and auxiliary accessories are zero-point calibrated and range verified to ensure normal equipment operation and that accessories are installed correctly without deformation.

[0064] Step S34: Perform standard mechanical strength tests of different strength types on the standard test specimens after standard curing using a mechanical testing machine to obtain the corresponding test failure loads;

[0065] In this step, the specimens that have been cured for 28 days are taken out, the surface moisture is wiped dry, and the surface impurities are removed. The standard tests are carried out in the order of compressive strength, splitting tensile strength, bending strength, and axial compressive strength.

[0066] Step S35: Calculate the strength value of the standard test specimen using the failure load of different strength types of tests;

[0067] In this step, the measured strength values ​​of individual specimens are calculated according to the national standard formula.

[0068] Step S36: After determining the outliers, take the average value of the strength values ​​of standard test specimens under the same strength type to obtain the mechanical strength characteristic value of the target concrete under the corresponding strength type.

[0069] In this step, the strength values ​​of all individual specimens under the same strength type are statistically analyzed, and the average value within the group is calculated. If the deviation of a single specimen's strength value from the average value within the group is greater than ±15%, it is identified as an outlier and removed. After removing outliers, if the number of remaining qualified specimens is ≥2, the arithmetic mean of the remaining specimen strength values ​​is taken as the strength result for that group; if the number of remaining qualified specimens is <2, the test for that group is deemed invalid, and specimens need to be re-made, cured, and tested again. After outlier identification and valid data verification, the average values ​​within the group for compressive, splitting tensile, flexural, and axial compressive strengths are the mechanical strength characteristic values ​​for the target concrete under the corresponding strength type.

[0070] Step S4: Calculate the scenario-specific durability characteristic value of the target concrete based on its application scenario;

[0071] In this step, the scenario-based durability characteristic value is... or , These are scenario-specific durability characteristic values ​​under a single durability metric. These are scenario-specific durability characteristic values ​​under multiple durability indices.

[0072] Step S4 includes:

[0073] Step S41: Select durability indicators based on the application scenario of the target concrete;

[0074] Step S41 includes:

[0075] Step S411: Analyze the application scenario of the target concrete and identify the core erosion and degradation factors of the environment in which the project is located;

[0076] Based on the engineering application scenarios of the target concrete (such as shield tunnels, cross-sea bridges, hydraulic structures in cold regions, and saline soil buildings), this study analyzes and clarifies the core erosion and degradation factors leading to the deterioration of concrete structures in these scenarios, using engineering geological survey reports, environmental monitoring data, and industry engineering experience. Specifically, for cross-sea or near-shore projects, the factors include seawater chloride ion erosion, sulfate erosion, and salt crystallization damage; for cold-region projects, the factors include freeze-thaw cycle erosion; and for inland arid projects, the factors include carbonation erosion.

[0077] Step S412: Select at least one durability index based on the core corrosion and deterioration factors;

[0078] In this step, durability indicators may include resistance to chloride ion penetration, frost resistance, carbonation resistance, and sulfate resistance. Based on the identified core corrosion and deterioration factors, one (single indicator) or multiple (multiple indicators) key durability indicators are selected from the concrete durability evaluation indicators. These indicators must be compatible with national / industry standard test methods. For example, chloride ion corrosion can determine chloride ion penetration resistance as a durability indicator, while carbonation corrosion can determine carbonation resistance as a durability indicator.

[0079] Taking near-shore or cross-sea construction projects as an example, the core corrosion and deterioration factor is chloride ion corrosion in seawater, which easily leads to steel corrosion and is the main risk of structural failure. Therefore, the most relevant durability index should be chloride ion permeability resistance, and sulfate resistance can also be selected due to sulfate corrosion.

[0080] Step S413: If multiple durability indicators are selected, a weighting coefficient is set for each durability indicator according to the importance of the project and the severity of the environment. The weighting coefficient is used to calculate the baseline durability characteristic value.

[0081] In this step, if multiple durability indicators are selected, a weighting coefficient is set for each durability indicator according to the importance level of the project (such as level 1 / 2 / 3 project) and the severity of the environment (such as strong corrosion / medium corrosion / weak corrosion), and the sum of the weights of all indicators must be 1.

[0082] Step S42: Prepare multiple standard test specimens according to the mix proportions of the target concrete;

[0083] Step S43: After standard curing of the test standard specimens, conduct laboratory standard tests based on durability indicators and obtain durability test data;

[0084] In this step, all qualified standard test specimens are placed in a standard curing room for 28 days of curing. After the curing period, laboratory standard tests for selected durability indicators are conducted on the specimens according to the corresponding national / industry durability test standards. The core measured data (i.e., durability test data) during the test process are recorded. The data must be valid (the deviation of parallel specimen test results must meet the specification requirements). For example, for sulfate resistance, the number of sulfate wet-dry cycles and the loss of concrete compressive strength after each cycle must be recorded; for impermeability, the penetration test time and the depth of water penetration into the concrete after penetration must be recorded; and for chloride ion penetration resistance, the concrete electrical flux and chloride ion diffusion coefficient must be recorded.

[0085] Step S44: Convert the durability test data into the corresponding baseline durability characteristic values;

[0086] In this step, the durability test data is rationalized and transformed into a dimensionless or physically meaningful numerical value, referred to as the benchmark durability characteristic value of concrete. For example, the benchmark durability characteristic value corresponding to sulfate attack resistance is the ratio of the number of sulfate wet-dry cycles to the loss of concrete compressive strength after the cycles, while the benchmark durability characteristic value corresponding to impermeability is the ratio of the penetration test time to the depth of water penetration inside the concrete after penetration.

[0087] Step S45: Determine the correction coefficient for the engineering scenario;

[0088] The engineering scenario correction coefficient is calculated using the environmental erosion intensity coefficient and the structural stress state coefficient.

[0089] The engineering scenario correction factor includes the environmental erosion intensity factor. and structural stress state coefficient This is used to map the baseline durability characteristics from the laboratory to actual engineering scenarios, and each value needs to be calculated and verified separately.

[0090] Step S45 includes:

[0091] Step S451: Determine the laboratory baseline environmental parameters according to national standards;

[0092] In this step, the national / industry testing standards corresponding to the selected durability index are consulted, and the baseline environmental parameters used in the laboratory to conduct durability tests are extracted. This refers to the corrosion environment parameters of the standard test, such as the concentration of the standard sulfate solution in the laboratory under sulfate corrosion resistance is 50,000 mg / L, and the water pressure in the standard test for impermeability is 1.4 MPa.

[0093] Step S452: Obtain the actual environmental parameters corresponding to the application scenario of the target concrete through engineering geological survey report, on-site sampling and testing, and long-term hydrological monitoring;

[0094] Step S453: Calculate the preliminary environmental erosion intensity coefficient based on laboratory baseline environmental parameters and environmental parameters;

[0095] In this step, different types of durability indices correspond to preliminary environmental erosion intensity coefficients. The calculation formulas differ. For example, under sulfate erosion resistance, the erosion rate is positively correlated with the logarithm of the concentration. Therefore, the corresponding preliminary environmental erosion intensity coefficient is:

[0096] ;

[0097] In the formula, This represents the initial environmental erosion intensity coefficient corresponding to resistance to sulfate attack. This indicates the baseline environmental parameters corresponding to resistance to sulfate attack. This indicates the actual environmental parameters corresponding to resistance to sulfate attack.

[0098] For example, under the impermeability condition, the ratio of the test water pressure to the actual on-site water pressure corresponds to the preliminary environmental erosion intensity coefficient as follows:

[0099] ;

[0100] In the formula, This represents the preliminary environmental erosion intensity coefficient corresponding to impermeability. This indicates the baseline environmental parameters corresponding to impermeability. This indicates the actual environmental parameters corresponding to impermeability.

[0101] Step S454: Correct the preliminary environmental erosion intensity coefficient through parallel verification tests to obtain the environmental erosion intensity coefficient;

[0102] In this step, a parallel accelerated corrosion verification test was designed: three groups of concrete specimens were set up. Group A was placed in a solution / water pressure simulating the actual field environment, Group B was placed in a standard laboratory environment, and Group C was placed in a standard curing environment (blank control group). The three groups of specimens were subjected to accelerated corrosion tests under the same temperature and humidity conditions until significant deterioration was observed. Using key damage indicators (such as strength loss rate, penetration depth, and mass loss rate) as benchmarks, the deterioration results of Group A and Group B were compared, and adjustments were made based on the difference in deterioration rate. The value of is used to obtain the environmental erosion intensity coefficient. .

[0103] Step S455: Analyze the stress state of the target concrete in actual engineering practice;

[0104] In this step, based on the engineering structural design drawings and structural stress calculation report of the target concrete, the stress state of the concrete during actual service is analyzed and clarified, including:

[0105] Types of loads: compression, tension, and bending loads (such as tunnel segments which mainly bear compression loads).

[0106] Actual stress level: The actual stress value / stress level borne by the concrete;

[0107] Stress duration: long-term stress / short-term stress.

[0108] Step S456: Conduct a force-environmental erosion coupled laboratory test to test the baseline durability value of concrete under no stress and the durability value of concrete under actual stress.

[0109] In this step, specimens of the same specifications as those used in the durability test are prepared according to the target concrete mix proportion. After standard curing, they are divided into two groups: a stress-free group and an actual stress group. Then, using a force-environmental erosion coupling test device, the specimens of the actual stress group are placed under the coupled conditions of simulated field environment and actual engineering stress, while the specimens of the stress-free group are placed only under the same simulated field environment.

[0110] Accelerated corrosion tests were conducted simultaneously. After the tests, the baseline durability values ​​of the stress-free concrete were measured. Durability value of concrete under actual stress state (The test method is consistent with the standard laboratory test.)

[0111] Step S457: Calculate the structural stress state coefficient using the baseline durability value of the unstressed concrete and the durability value of the concrete under actual stress.

[0112] In this step, the structural stress state coefficient for and The ratio, It reflects the ratio of decrease / increase in concrete durability due to stress.

[0113] Step S46: Correct the baseline durability characteristic value using the engineering scenario correction coefficient to obtain the corresponding scenario-based durability characteristic value.

[0114] In this step, the baseline durability characteristic value is multiplied by the engineering scenario correction factor to obtain a scenario-based durability characteristic value that fits the actual engineering situation. / The engineering scenario correction factor is the environmental erosion intensity factor. and structural stress state coefficient The product of.

[0115] Specifically, if the scenario-based durability characteristic value is Then, multiplying the baseline durability characteristic value, environmental erosion intensity coefficient, and structural stress state coefficient corresponding to the single durability index yields the scenario-specific durability characteristic value for that single durability index. .

[0116] If the scenario-based durability characteristic value is This will correspond to multiple durability indicators. The weighted summation of the weight coefficients corresponding to the durability indicators yields the scenario-specific durability feature values ​​under multiple durability indicators. .

[0117] Step S5: Calculate the comprehensive evaluation index of carbon emissions for the target concrete using carbon emissions, mechanical strength characteristic values, and scenario-based durability characteristic values;

[0118] In this step, if it is a single durability index, the mechanical strength characteristic value is... The comprehensive carbon emission evaluation indicators are as follows:

[0119] ;

[0120] In the formula, This represents the comprehensive evaluation index of carbon emissions for the target concrete under a single durability index. This indicates the carbon emissions per unit volume of the target concrete. Represents the characteristic value of mechanical strength. These are scenario-specific durability characteristic values ​​under a single durability index.

[0121] If multiple durability indicators are involved, the mechanical strength characteristic value... The comprehensive carbon emission evaluation indicators are as follows:

[0122] ;

[0123] In the formula, This represents a comprehensive evaluation index for the carbon emissions of target concrete under multiple durability indicators. This indicates the carbon emissions per unit volume of the target concrete. Represents the characteristic value of mechanical strength. These are scenario-specific durability characteristic values ​​under multiple durability indices.

[0124] At the same time, multiple independent mechanical strength characteristic values ​​(compressive strength) were obtained through calculation. Splitting tensile strength Flexural strength and axial compressive strength Therefore, it is necessary to separately correlate the mechanical strength characteristic value with... , / Matching calculations are performed to obtain the comprehensive carbon emission evaluation index corresponding to each intensity type. There is no combined calculation here, which ensures that the carbon efficiency of each intensity dimension can be evaluated separately.

[0125] Step S6: Compare the comprehensive carbon emission evaluation index of the target concrete and the benchmark concrete to obtain the carbon emission evaluation result of the target concrete.

[0126] In this step, the comprehensive evaluation index of carbon emissions in each dimension of the target concrete is compared one by one with the index of the benchmark concrete in the same dimension. or The smaller the value, the higher the carbon efficiency of the concrete while meeting the same strength and durability requirements, and the greater its potential for carbon reduction throughout its life cycle. Simultaneously, it can be determined based on... or The decrease rate was analyzed to assess the carbon efficiency adaptability of the target concrete under single durability requirements and comprehensive durability requirements.

[0127] In summary, by comparing the target concrete with the benchmark concrete in the same dimension, the improvement in carbon efficiency and the potential for carbon emission reduction can be quantified intuitively, providing a clear decision-making basis for engineering design, concrete mix optimization, and selection of low-carbon building materials.

[0128] Example 2:

[0129] In this embodiment, the comprehensive evaluation index of carbon emissions of the target concrete under a single durability index is adopted. An evaluation was conducted. The mix proportions of ultra-low carbon concrete per unit volume for shield tunnel segments were: 426.63 kg blast furnace slag, 211.9 kg sodium silicate, 36.64 kg water, 665.25 kg fine aggregate, 857.87 kg coarse aggregate (10-20 mm), and 214.47 kg coarse aggregate (5-10 mm). Relevant Life Cycle Inventory (LCI) data were primarily referenced from international databases and previous research findings, including the China Life Cycle Inventory Database, the European Life Cycle Inventory Database, and carbon and energy inventories. Furthermore, the carbon emission factors for various materials were also based on the relevant provisions in the "Building Carbon Emission Calculation Standard" (GB / T 51366-2019). Due to the significant variability in the transportation distance of raw materials, this embodiment adopted the default value in the standard, with a concrete transportation distance of 40 km.

[0130] Calculate the carbon emissions per unit volume of concrete with this mix design using the Life Cycle Assessment (LCA) method. It is 240.81 kg CO2 eq / m 3 .

[0131] The mechanical strength characteristic value of the concrete is calculated through experimental testing or based on empirical formulas. Its compressive strength Splitting tensile strength Flexural strength and axial compressive strength The values ​​are 82.1 MPa, 4.81 MPa, 5.8 MPa, and 65.01 MPa, respectively.

[0132] This embodiment uses sulfate attack as the core corrosion degradation factor, that is, sulfate attack resistance as the core durability indicator. According to the sulfate attack resistance test results of this embodiment, after 150 sulfate wet-dry cycles, the compressive strength of the concrete decreased by 16.9%. ,in, This represents the baseline durability characteristic value under sulfate attack. The environmental impact level of salt crystallization on the outer surface of the lining of the Jintang Subsea Tunnel of the Ningbo-Zhoushan Railway is Y3 (environmental conditions: sulfate ion concentration in water >2000 mg / L, ≤5000 mg / L), set at 5000 mg / L. The sulfate solution concentration in the laboratory standard environment is 50000 mg / L. The concentration of the corrosive medium in the field (5000 mg / L) is lower than the laboratory standard concentration (50000 mg / L). Assuming that the erosion rate is positively correlated with the logarithm of the concentration (simplified according to Fick's Law), then the following formula can be used to determine the corrosion rate. And parallel verification experiments, obtained It is 1.268. This represents the environmental erosion intensity coefficient indicating resistance to sulfate attack. Furthermore, based on the results of high-stress-sulfate wet-dry cycle coupled tests, If the attenuation reaches 95% of the stress-free state, then Thus, the calculation is obtained , This indicates the scene-specific durability characteristics under sulfate attack. This represents the structural stress state coefficient that resists sulfate attack.

[0133] This embodiment also employs four comprehensive carbon emission evaluation indicators that consider both concrete durability and strength, namely: , , and ,in, express and The comprehensive evaluation index of carbon emissions under the following conditions express and The comprehensive evaluation index of carbon emissions under the following conditions express and The comprehensive evaluation index of carbon emissions under the following conditions express and The comprehensive carbon emission evaluation index is calculated. , , and Specifically, they are 0.274, 4.68, 3.88, and 0.35.

[0134] In this embodiment, the mix proportion of ordinary concrete for C60 tunnel segments is used as the reference concrete, and the comprehensive carbon emission evaluation index of the reference concrete is calculated. , , and The values ​​were 0.89, 14.19, 9.42, and 1.01, respectively. Compared with the benchmark concrete, the ultra-low carbon concrete for shield tunnel segments... , , and They decreased by 69.2%, 67.02%, 58.8%, and 65.3%, respectively.

[0135] In summary, the comprehensive carbon emission evaluation index of ultra-low carbon concrete for shield tunnel segments is much lower than that of benchmark concrete, indicating that it has higher carbon efficiency and greater potential for carbon emission reduction throughout its entire life cycle while meeting the same strength and durability requirements.

[0136] Example 3:

[0137] In this embodiment, a comprehensive evaluation index of carbon emissions of the target concrete under multiple durability indicators is also used. An evaluation of ultra-low carbon concrete for shield tunnel segments was conducted. Its mix proportions, and The calculation steps are the same as those for the single durability index in Example 2.

[0138] This embodiment uses sulfate resistance and impermeability as durability indicators for evaluation, and sets weights: a weighting coefficient for sulfate resistance. Weighting factor for impermeability .

[0139] Using impermeability as the primary durability indicator, a value can be defined. ,in, The time for penetration during the impermeability test. For infiltration The depth of water penetration inside the concrete after hours This represents the baseline durability characteristic value under impermeability conditions. The higher the value, the better the impermeability of the target concrete. The highest water pressure in the sea area section of the Jintang Subsea Railway Tunnel of the Ningbo-Zhoushan Railway is 0.85 MPa, and the test water pressure is 1.4 MPa. This is determined using the formula... And parallel verification experiments, obtained , This is the environmental erosion intensity coefficient representing impermeability. Based on the results of high-stress-high-water-pressure coupled tests, If the decay reaches 86% of the stress-free state, then , The structural stress state coefficient represents the impermeability.

[0140] According to the impermeability test results of this embodiment, after 72 hours of penetration, the water penetration depth inside the target concrete was 2.68 cm. .

[0141] at this time , This represents the scenario-specific durability characteristic value under impermeability conditions.

[0142] Using sulfate resistance as the second durability indicator, as in Example 2, the following results were obtained. , This represents the scene-specific durability characteristic value under sulfate attack.

[0143] right and Perform a weighted summation to obtain ,at this time These are scenario-specific durability characteristic values ​​obtained under two durability indicators: resistance to sulfate attack and impermeability.

[0144] pass , and Four comprehensive carbon emission evaluation indicators considering concrete durability (multi-factor) and strength were calculated, respectively. , , and ,in, express and The comprehensive evaluation index of carbon emissions under the following conditions express and The comprehensive evaluation index of carbon emissions under the following conditions express and The comprehensive evaluation index of carbon emissions under the following conditions express and The comprehensive carbon emission evaluation index is calculated. , , and Specifically, the values ​​are 0.109, 1.85, 1.54, and 0.137.

[0145] This embodiment uses the C60 segment ordinary concrete mix proportion as the benchmark concrete, and calculates the comprehensive carbon emission evaluation index. , , and The values ​​were 0.41, 6.58, 4.37, and 0.47, respectively. Compared with the benchmark concrete, the ultra-low carbon concrete for shield tunnel segments... , , and They decreased by 73.4%, 71.9%, 64.8%, and 70.9%, respectively.

[0146] In summary, the comprehensive carbon emission evaluation index of ultra-low carbon concrete for shield tunnel segments is significantly lower than that of benchmark concrete, indicating that it has higher carbon efficiency while meeting the same strength and durability (multi-factor) requirements, and greater potential for carbon emission reduction throughout its entire life cycle. Furthermore, when considering multiple durability indicators, the comprehensive carbon efficiency advantage is even more pronounced, indicating a significant improvement in the impermeability of ultra-low carbon concrete for shield tunnel segments.

[0147] Example 4:

[0148] This embodiment provides a comprehensive carbon emission evaluation system based on concrete durability and strength, the system comprising:

[0149] The determination module is used to determine the mix proportions and raw material data of the target concrete;

[0150] The first calculation module is used to calculate the carbon emissions per unit volume of the target concrete based on the mix proportions and raw material data of the target concrete, using the life cycle assessment method.

[0151] The second calculation module is used to calculate multiple mechanical strength characteristic values ​​of the target concrete;

[0152] The third calculation module is used to calculate the scenario-based durability characteristic value of the target concrete according to the application scenario of the target concrete.

[0153] The fourth calculation module is used to calculate the comprehensive evaluation index of carbon emissions of the target concrete through carbon emissions, mechanical strength characteristic values ​​and scenario-based durability characteristic values;

[0154] The evaluation module is used to compare the comprehensive carbon emission evaluation indicators of the target concrete and the benchmark concrete to obtain the carbon emission evaluation results of the target concrete.

[0155] The first computing module includes:

[0156] The extraction unit is used to extract the core parameters of each raw material in the unit volume of the target concrete based on the mix proportion and raw material data of the target concrete. The core parameters include raw material usage, carbon emission factor, transportation data, production consumption data and curing consumption data.

[0157] The first calculation unit is used to calculate carbon emissions during the raw material production stage based on raw material usage and carbon emission factors.

[0158] The second calculation unit is used to calculate carbon emissions during the raw material transportation stage based on raw material usage and transportation data.

[0159] The third calculation unit is used to calculate carbon emissions during the concrete production stage using production consumption data.

[0160] The fourth calculation unit is used to calculate carbon emissions during the concrete curing stage using curing consumption data;

[0161] The fifth calculation unit is used to calculate the carbon emissions of the target concrete per unit volume by considering carbon emissions during the raw material production stage, the raw material transportation stage, the concrete production stage, and the concrete curing stage.

[0162] The second calculation module includes:

[0163] The first preparation unit is used to prepare multiple standard test specimens of the target concrete according to the mix proportion of the target concrete;

[0164] The curing unit is used to perform standard curing on standard test specimens;

[0165] The first selection unit is used to select a mechanical testing machine with a matching range based on the strength design grade of the target concrete.

[0166] The test unit is used to conduct standard mechanical strength tests of different strength types on standard test specimens after standard curing using a mechanical testing machine, and to obtain the corresponding test failure loads.

[0167] The sixth calculation unit is used to calculate the strength value of standard test specimens through test failure loads of different strength types;

[0168] The seventh calculation unit is used to take the average value of the strength values ​​of standard test specimens under the same strength type after outlier detection, and obtain the mechanical strength characteristic value of the target concrete under the corresponding strength type.

[0169] The third calculation module includes:

[0170] The second selection unit is used to select durability indicators based on the application scenario of the target concrete.

[0171] The preparation unit is used to prepare multiple standard test specimens according to the mix proportions of the target concrete;

[0172] The second preparation unit is used to perform standard curing on the test standard specimens, conduct laboratory standard tests based on durability indicators, and obtain durability test data.

[0173] The conversion unit is used to convert durability test data into corresponding baseline durability characteristic values;

[0174] The unit is used to determine the correction coefficient for engineering scenarios;

[0175] The correction unit is used to correct the baseline durability characteristic value by means of the engineering scenario correction coefficient to obtain the corresponding scenario-based durability characteristic value.

[0176] It should be noted that the specific methods by which each module performs operations in the system described in the above embodiments have been described in detail in the embodiments related to the method, and will not be elaborated here.

[0177] Example 5:

[0178] Corresponding to the above method embodiments, this embodiment also provides a carbon emission comprehensive evaluation device based on concrete durability and strength. The carbon emission comprehensive evaluation device based on concrete durability and strength described below can be referred to in correspondence with the carbon emission comprehensive evaluation method based on concrete durability and strength described above.

[0179] Figure 2 This is a block diagram illustrating a comprehensive carbon emission assessment device 800 based on concrete durability and strength, according to an exemplary embodiment. Figure 2 As shown, the carbon emission comprehensive evaluation device 800 based on concrete durability and strength may include: a processor 801 and a memory 802. The device 800 may also include one or more of the following: a multimedia component 803, an I / O interface 804, and a communication component 805.

[0180] The processor 801 controls the overall operation of the carbon emission comprehensive evaluation device 800 based on concrete durability and strength to complete all or part of the steps in the aforementioned carbon emission comprehensive evaluation method based on concrete durability and strength. The memory 802 stores various types of data to support the operation of the carbon emission comprehensive evaluation device 800 based on concrete durability and strength. This data may include, for example, instructions for any application or method operating on the device, as well as application-related data such as contact data, sent and received messages, images, audio, video, etc. The memory 802 can be implemented using any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The multimedia component 803 may include a screen and an audio component. The screen may be, for example, a touchscreen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 802 or transmitted via the communication component 805. The audio component also includes at least one speaker for outputting audio signals. I / O interface 804 provides an interface between processor 801 and other interface modules, such as keyboards, mice, and buttons. These buttons can be virtual or physical. Communication component 805 is used for wired or wireless communication between the carbon emission comprehensive evaluation device 800 based on concrete durability and strength and other devices. Wireless communication includes Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, or 4G, or a combination thereof. Therefore, the corresponding communication component 805 may include a Wi-Fi module, a Bluetooth module, and an NFC module.

[0181] In an exemplary embodiment, the carbon emission comprehensive evaluation device 800 based on concrete durability and strength can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the aforementioned carbon emission comprehensive evaluation method based on concrete durability and strength.

[0182] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided. When executed by a processor, these program instructions implement the steps of the aforementioned comprehensive carbon emission evaluation method based on concrete durability and strength. For example, the computer-readable storage medium may be the aforementioned memory 802 including program instructions, which may be executed by the processor 801 of the comprehensive carbon emission evaluation device 800 based on concrete durability and strength to complete the aforementioned comprehensive carbon emission evaluation method based on concrete durability and strength.

[0183] Example 6:

[0184] Corresponding to the above method embodiments, this embodiment also provides a readable storage medium. The readable storage medium described below can be referred to in conjunction with the carbon emission comprehensive evaluation method based on concrete durability and strength described above.

[0185] A readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the comprehensive carbon emission evaluation method based on concrete durability and strength as described in the above method embodiments.

[0186] Specifically, the readable storage medium can be a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, or any other readable storage medium capable of storing program code.

[0187] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0188] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A comprehensive carbon emission evaluation method based on concrete durability and strength, characterized in that, include: Determine the mix proportions and raw material data for the target concrete; Based on the mix proportions and raw material data of the target concrete, the carbon emissions per unit volume of the target concrete are calculated using the life cycle assessment method. Calculate multiple mechanical strength characteristic values ​​of the target concrete; Calculate the scenario-specific durability characteristic value of the target concrete based on its application scenario; The comprehensive evaluation index of carbon emissions for the target concrete is calculated by considering carbon emissions, mechanical strength characteristics, and scenario-based durability characteristics. The carbon emission evaluation results of the target concrete are obtained by comparing the comprehensive evaluation indicators of carbon emissions of the target concrete and the benchmark concrete.

2. The comprehensive carbon emission evaluation method based on concrete durability and strength according to claim 1, characterized in that, The carbon emissions per unit volume of the target concrete are calculated using a life cycle assessment method based on the mix proportions and raw material data of the target concrete, including: Based on the mix proportion and raw material data of the target concrete, the core parameters of each raw material in the unit volume of the target concrete are extracted. The core parameters include raw material usage, carbon emission factor, transportation data, production consumption data and curing consumption data. Carbon emissions during the raw material production stage are calculated using raw material usage and carbon emission factors. Carbon emissions during the raw material transportation phase are calculated using raw material usage and transportation data. Carbon emissions during the concrete production stage are calculated using production consumption data. Carbon emissions during the concrete curing stage are calculated using maintenance consumption data. The carbon emissions per unit volume of the target concrete are calculated by analyzing carbon emissions during the raw material production stage, the raw material transportation stage, the concrete production stage, and the concrete curing stage.

3. The comprehensive carbon emission evaluation method based on concrete durability and strength according to claim 1, characterized in that, The calculation of multiple mechanical strength characteristic values ​​of the target concrete includes: According to the mix proportions of the target concrete, prepare multiple standard test specimens of the target concrete; Standard curing was performed on the standard test specimens; Select a mechanical testing machine with a matching range based on the target concrete strength design grade; The mechanical strength standard tests of different strength types were carried out on the standard test specimens after standard curing using a mechanical testing machine to obtain the corresponding test failure loads. The strength value of the standard test specimen is calculated by using the failure load of tests of different strength types; The strength values ​​of standard test specimens under the same strength type are averaged after outlier detection to obtain the mechanical strength characteristic value of the target concrete under the corresponding strength type.

4. The comprehensive carbon emission evaluation method based on concrete durability and strength according to claim 1, characterized in that, The calculation of the scenario-specific durability characteristic value of the target concrete based on its application scenario includes: The durability index is selected based on the application scenario of the target concrete; According to the mix proportions of the target concrete, multiple standard test specimens were prepared; After standard curing of the test specimens, laboratory standard tests based on durability indicators are conducted, and durability test data are obtained. The durability test data is converted into corresponding baseline durability characteristic values; Determine the correction factor for the engineering scenario; The baseline durability characteristic value is corrected by the engineering scenario correction factor to obtain the corresponding scenario-based durability characteristic value.

5. The comprehensive carbon emission evaluation method based on concrete durability and strength according to claim 4, characterized in that, The selection of durability indicators based on the application scenario of the target concrete includes: Analyze the application scenarios of the target concrete and identify the core erosion and degradation factors of the project's environment; Based on the core erosion and deterioration factors, select at least one durability index; If multiple durability indicators are selected, a weighting coefficient is set for each durability indicator according to the importance of the project and the severity of the environment. The weighting coefficient is used to calculate the baseline durability characteristic value.

6. The comprehensive carbon emission evaluation method based on concrete durability and strength according to claim 4, characterized in that, The engineering scenario correction coefficient is calculated using the environmental erosion intensity coefficient and the structural stress state coefficient. Determining the engineering scenario correction coefficient includes: The laboratory baseline environmental parameters are determined using national standards. Through engineering geological survey reports, on-site sampling and testing, and long-term hydrological monitoring, the actual environmental parameters corresponding to the application scenarios of the target concrete are obtained. Preliminary environmental erosion intensity coefficients were calculated based on laboratory baseline environmental parameters and environmental parameters. The preliminary environmental erosion intensity coefficient was corrected through parallel verification experiments to obtain the final environmental erosion intensity coefficient. Analyze the stress state of the target concrete in actual engineering practice; A force-environment erosion coupled laboratory test was conducted to test the baseline durability value of concrete under no stress and the durability value of concrete under actual stress. The structural stress state coefficient is calculated by using the baseline durability value of concrete under stress-free conditions and the durability value of concrete under actual stress conditions.

7. A comprehensive carbon emission evaluation system based on concrete durability and strength, characterized in that, include: The determination module is used to determine the mix proportions and raw material data of the target concrete; The first calculation module is used to calculate the carbon emissions per unit volume of the target concrete based on the mix proportions and raw material data of the target concrete, using the life cycle assessment method. The second calculation module is used to calculate multiple mechanical strength characteristic values ​​of the target concrete; The third calculation module is used to calculate the scenario-based durability characteristic value of the target concrete according to the application scenario of the target concrete. The fourth calculation module is used to calculate the comprehensive evaluation index of carbon emissions of the target concrete through carbon emissions, mechanical strength characteristic values ​​and scenario-based durability characteristic values; The evaluation module is used to compare the comprehensive carbon emission evaluation indicators of the target concrete and the benchmark concrete to obtain the carbon emission evaluation results of the target concrete.

8. The comprehensive carbon emission evaluation system based on concrete durability and strength according to claim 7, characterized in that, The first computing module includes: The extraction unit is used to extract the core parameters of each raw material in the unit volume of the target concrete based on the mix proportion and raw material data of the target concrete. The core parameters include raw material usage, carbon emission factor, transportation data, production consumption data and curing consumption data. The first calculation unit is used to calculate carbon emissions during the raw material production stage based on raw material usage and carbon emission factors. The second calculation unit is used to calculate carbon emissions during the raw material transportation stage based on raw material usage and transportation data. The third calculation unit is used to calculate carbon emissions during the concrete production stage using production consumption data. The fourth calculation unit is used to calculate carbon emissions during the concrete curing stage using curing consumption data; The fifth calculation unit is used to calculate the carbon emissions of the target concrete per unit volume by considering carbon emissions during the raw material production stage, the raw material transportation stage, the concrete production stage, and the concrete curing stage.

9. The comprehensive carbon emission evaluation system based on concrete durability and strength according to claim 7, characterized in that, The second calculation module includes: The first preparation unit is used to prepare multiple standard test specimens of the target concrete according to the mix proportion of the target concrete; The curing unit is used to perform standard curing on standard test specimens; The first selection unit is used to select a mechanical testing machine with a matching range based on the strength design grade of the target concrete. The test unit is used to conduct standard mechanical strength tests of different strength types on standard test specimens after standard curing using a mechanical testing machine, and to obtain the corresponding test failure loads. The sixth calculation unit is used to calculate the strength value of standard test specimens through test failure loads of different strength types; The seventh calculation unit is used to take the average value of the strength values ​​of standard test specimens under the same strength type after outlier detection, and obtain the mechanical strength characteristic value of the target concrete under the corresponding strength type.

10. The comprehensive carbon emission evaluation system based on concrete durability and strength according to claim 7, characterized in that, The third calculation module includes: The second selection unit is used to select durability indicators based on the application scenario of the target concrete. The preparation unit is used to prepare multiple standard test specimens according to the mix proportions of the target concrete; The second preparation unit is used to perform standard curing on the test standard specimens, conduct laboratory standard tests based on durability indicators, and obtain durability test data. The conversion unit is used to convert durability test data into corresponding baseline durability characteristic values; The unit is used to determine the correction coefficient for engineering scenarios; The correction unit is used to correct the baseline durability characteristic value by means of the engineering scenario correction coefficient to obtain the corresponding scenario-based durability characteristic value.

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