High-performance low-carbon concrete and preparation method thereof

Abstract

The application discloses a kind of high-performance low-carbon concrete and preparation method thereof, by following weight parts raw materials composition: integrated cementitious material: 360-520 parts;Fine aggregate 800-900 parts;Coarse aggregate: 1100-1200 parts;Water reducing agent: 7.0-9.0 parts;Water: 160-180 parts;Integrated cementitious material is obtained by following weight parts raw materials dry mixing uniformly: Portland cement clinker powder 35-40 parts;High calcium high iron belite sulphoaluminate cement clinker powder 5-6 parts;Fine limestone powder 5-10 parts;Fine fly ash 14-20 parts;Slag powder 10-15 parts;Steel slag powder 10-15 parts;Coarse limestone powder 5-10 parts.The low-carbon concrete of the application, relative to traditional concrete, under the same cementitious material dosage, C30-C60 grade concrete each age period compressive strength increases 2-4MPa, extension degree is significantly increased, and concrete carbon emission intensity is reduced by 14.3%.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of concrete, in particular relates to a high-performance low-carbon concrete and a preparation method thereof. BACKGROUND

[0002] The engineering construction industry accounts for more than 40% of global carbon emissions, and concrete, as the most widely used building material, accounts for 6-10% of global carbon emissions. In the context of the world actively "reducing carbon", it is of great practical significance to develop and utilize low-carbon concrete. Cement is the main source of carbon emissions in concrete, and each production of 1 ton of Portland cement clinker emits about 830 kg of CO2, so significantly reducing the amount of cement clinker or cementitious material in concrete and using more mineral admixtures is the most effective method to reduce the carbon footprint of concrete.

[0003] Chinese patent CN 103193434 A discloses a low-carbon and carbon-absorbing concrete and a preparation method thereof, which uses high-calcium fly ash as a mineral admixture and uses the excess f-CaO from high-calcium fly ash to absorb CO2, thereby achieving the purpose of carbon absorption; Chinese patent CN 114890744 A discloses a preparation method of green low-carbon concrete, which uses high-titanium slag powder as a mineral admixture and mainly uses TiO2 and perovskite in high-titanium slag powder to absorb and reduce CO2, thereby achieving carbon reduction of concrete; Chinese patent CN 114835455 A discloses a low-carbon concrete and cementitious material, which mainly increases the proportion of first-grade fly ash in the cementitious material, with the proportion of first-grade fly ash reaching more than 50% and the content of cement reduced to less than 50%, thereby achieving low-carbon concrete by reducing the amount of cement; Chinese patent CN 108439833 A discloses a high-performance low-carbon concrete, which mainly selects slag powder, fine ceramic powder and fly ash as raw materials of cementitious material and adds nano-silica and nano-clay to form a micro-aggregate mixture with reasonable particle size distribution, thereby replacing cement and maintaining the strength of concrete to reduce the emission of CO2 and other greenhouse gases.

[0004] But the low-carbon concrete mentioned in the above technology has certain technical defects, such as although the f-CaO in high calcium fly ash can absorb CO2 to produce a certain carbon reduction effect, the micro-expansion of f-CaO in the later hydration of concrete will bring hidden dangers to the structural safety of concrete; the activity of high-titanium slag powder is much lower than that of ordinary slag powder, and the amount of cement replacement is very limited; although the first-class fly ash has very good activity effect and ball effect, the resource of the first-class fly ash is very limited, and only accounts for less than 10% of the total amount of fly ash, and the amount of cement clinker or cement saved by using the first-class fly ash to reduce the amount of cement in the cementitious material to less than 50% is also very small; although the addition of nanomaterials in concrete can greatly reduce the amount of cement in concrete and reduce the carbon reduction intensity of concrete, the high carbon emission generated by the preparation of nanomaterials is not taken into account, and the carbon reduction is not reduced in a true sense. In addition, the prior art has a major technical defect, that is, low-carbon concrete is prepared by using four basic materials of cement (or cementitious material), mineral admixture, aggregate and admixture. Because the mixed materials such as slag powder and fly ash are added in the production of cement, there is repetition or conflict in function with the mineral admixture added in the preparation process of concrete, so the overall development of the material is not considered, the performance of the material is not comprehensively designed and considered, which is not conducive to the overall optimization of the performance of the low-carbon concrete material, further reduces the amount of cement clinker in concrete, and realizes the maximum carbon reduction effect. SUMMARY

[0005] In view of the above problems existing in the prior art low-carbon concrete, the application provides a high-performance low-carbon concrete and a preparation method thereof. The application takes the dual goals of realizing the maximum reduction of carbon dioxide emission of concrete and high performance of concrete, adopts high-performance integrated cementitious material, simplifies the four basic raw materials commonly used in traditional concrete technology to three basic raw materials, unifies and coordinates the cement (or cementitious material) and the mineral admixture of concrete to prepare an integrated cementitious material, and then only needs to be mixed with aggregate and admixture.

[0006] The application is realized in the following manner. A high-performance low-carbon concrete is composed of the following raw materials by weight: integrated cementitious material: 360-520 parts; fine aggregate: 800-900 parts; coarse aggregate: 1100-1200 parts; water reducing agent: 7.0-9.0 parts; water: 160-180 parts.

[0007] The integrated cementitious material is obtained by uniformly dry-mixing the following raw materials in parts by weight: 35-40 parts of Portland cement clinker powder; 5-6 parts of high-calcium and high-iron belite sulphoaluminate cement clinker powder; 5-10 parts of fine limestone powder; 14-20 parts of ground fly ash; 10-15 parts of slag micropowder; 10-15 parts of steel slag micropowder; and 5-10 parts of coarse limestone powder.

[0008] In the above technical solution, preferably, the high calcium and high iron belite sulphoaluminate cement clinker powder is obtained by grinding high calcium and high iron belite sulphoaluminate cement clinker to a specific surface area of ​​380 to 400 m 2 / kg obtained;

[0009] High calcium and high iron belite sulphoaluminate cement clinker is fired by limiting its batching rate and mineral composition. It can adapt well to ordinary Portland cement and can significantly improve the early strength of integrated cementitious materials, especially it can promote the early hydration activity of various mineral admixtures added to the integrated cementitious materials. The batching parameters of the high calcium and high iron high belite sulphoaluminate cement clinker are: alkalinity coefficient Cm value is 1.60-1.65, fCaO is 0.5-1.0%, fSO3 is 0.5-1.0%; the mineral composition of the high calcium and high iron high belite sulphoaluminate cement clinker is calculated by weight percentage as follows: C2S mineral content is 50-60%, C4A3S mineral content is 20-25%, C6AF2 mineral content is 10-15%, C 12 A7 mineral content is 5-10%.

[0010] In the above technical solution, preferably, the Portland cement clinker powder is obtained by grinding 95% of ordinary Portland cement clinker and 5% of desulfurized gypsum together, with a specific surface area of ​​380-400m 2 / kg.

[0011] In the above technical solution, preferably, the fine limestone powder is obtained by ultrafine grinding limestone alone, with a specific surface area of ​​800-900m 2 / kg.

[0012] In the above technical solution, preferably, the ground fly ash is obtained by grinding the original fly ash separately, and the specific surface area is 500-550m 2 / kg.

[0013] In the above technical solution, preferably, the slag powder is obtained by grinding water-quenched slag separately, and has a specific surface area of ​​550-600m 2 / kg.

[0014] In the above technical solution, preferably, the steel slag powder is obtained by grinding converter steel slag separately, and has a specific surface area of ​​450-500m2 / kg.

[0015] In the above technical solution, preferably, the coarse limestone powder is obtained by grinding limestone alone, and the specific surface area is 150-200 m 2 / kg.

[0016] In the above technical solution, preferably, the fine aggregate is medium machine-made sand with fineness number of 2.5.

[0017] In the above technical solution, preferably, the coarse aggregate is stone with continuous gradation of particle size of 5-25 mm.

[0018] In the above technical solution, preferably, the water reducing agent is polycarboxylic acid superplasticizer, liquid agent with solid content of 20%, and water reducing rate is greater than 30%.

[0019] The preparation method of the high-performance low-carbon concrete comprises the following steps:

[0020] 1) The integrated cementitious material, fine aggregate, coarse aggregate, water reducing agent, and water are respectively weighed according to the formula amount.

[0021] 2) The weighed integrated cementitious material, fine aggregate, and coarse aggregate are poured into a mixer and stirred to be uniform to obtain a mixture.

[0022] 3) The weighed water reducing agent is mixed into water and fully dissolved and mixed, and then poured into the above mixture to continue stirring to obtain the low-carbon concrete.

[0023] The key technology of the low-carbon concrete prepared by the application is to replace cement (or cementitious material) and mineral admixtures in the concrete with an integrated cementitious material. The integrated cementitious material provided by the application maximally reduces the amount of Portland cement clinker, maximally utilizes limestone powder, fly ash, slag powder, steel slag powder and other mineral admixtures, and adds a new type of high-calcium and high-iron belite sulphoaluminate cement clinker to ensure that the early strength of the integrated cementitious material is not adversely affected by the large amount of mineral admixtures. The new type of high-calcium and high-iron belite sulphoaluminate cement clinker is different from the sulphoaluminate cement clinker or high-belite sulphoaluminate cement clinker in the prior art, and has the advantages of good compatibility with Portland cement clinker, significant improvement of the early strength of the Portland cement clinker system, and the ability to stimulate the early activity of fly ash, slag powder, steel slag powder and limestone powder, so that the early hydration of the integrated cementitious material can meet the development requirements of the concrete and reduce the early bleeding defects of the fresh concrete. The integrated cementitious material is designed according to the requirements of the optimal density of the concrete, and the particle size composition is coordinated with the particle size grading of the concrete aggregate. The cement clinker and auxiliary cementitious material are designed according to the hydration and hardening gradient of the concrete, so that the performance of the concrete is significantly improved and the amount of cement clinker in the concrete is maximally reduced, achieving carbon reduction.

[0024] The use of the integrated cementitious material overcomes the defects of the previous concrete material design and simplifies the concrete preparation process. More advantageously, the amount of Portland cement clinker in the integrated cementitious material is significantly lower than that in the existing cement or cementitious material, and the integrated cementitious material has good performance, which can ensure that the low-carbon concrete prepared by the application has good performance and the proportion of Portland cement clinker is maximally reduced, achieving the actual effect of significantly reducing carbon emission intensity.

[0025] The application has the following advantages and positive effects:

[0026] 1) The integrated cementitious material used in the low-carbon concrete of the application has a cement clinker content of 33-38%, has good strength, and has a 28d strength of 41.0-42.0MPa. It is a low-carbon cementitious material, and no other mineral admixtures are needed to prepare the concrete.

[0027] 2) The integrated cementitious material used in the low-carbon concrete of the application contains high-calcium and high-iron belite sulphoaluminate cement clinker, which can effectively stimulate the early hydration activity of large amounts of mineral admixtures, increase the 3d strength of the integrated cementitious material by 7.7MPa, and increase the 28d strength by 3.0MPa, significantly improving the performance.

[0028] 3) The low-carbon concrete of the present application uses an integrated cementitious material with a particle size distribution designed for optimal density. The particle distribution of the integrated cementitious material forms a good continuity with the particle size gradation of the aggregate, making the low-carbon concrete mixture have higher fluidity than ordinary concrete, and the concrete spreadability is increased by 10-15%.

[0029] 4) The low-carbon concrete of the present application has an increase of 2-4 MPa in the compressive strength of C30-C60 grade concrete at each age, and a significant increase in spreadability, compared with the concrete prepared by the traditional method, under the condition of the same amount of cementitious material, and is a high-performance concrete.

[0030] 5) The low-carbon concrete of the present application has a reduction of about 14.3% in the amount of cement clinker, and a reduction of 14.3% in the carbon emission intensity of concrete, compared with ordinary concrete, at different strength levels (C30-C60), and is a low-carbon concrete.

[0031] 6) The low-carbon concrete of the present application uses an integrated cementitious material, and does not need to add any mineral admixtures during the preparation of the concrete, simplifying the batching process of the concrete and further improving the homogeneity and construction performance of the concrete. The secondary hydration reaction of a large amount of mineral admixtures in the cementitious material strengthens the interfacial transition zone between the hardened cement paste and the aggregate, and improves and enhances the long-term durability of the concrete. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the present application will be further described in detail below with reference to examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0033] Example 1 Preparation of high calcium and high iron belite sulphoaluminate cement clinker powder

[0034] According to the weight ratio and batching rate values shown in Table 1, 1.0 tons of raw material with a fineness of 0.08 mm and a sieve residue of less than 8% is obtained by grinding, and after calcination in a rotary kiln at 1350℃, 0.75 tons (raw material loss on ignition is 25%) of high calcium and high iron belite sulphoaluminate cement clinker is obtained, and high calcium and high iron belite sulphoaluminate cement clinker powder with a specific surface area of 380-400 m 2 / kg is obtained by grinding.

[0035] Table 1 Raw material ratio and batching rate values

[0036]

[0037] The mineral composition of the high calcium and high iron belite sulphoaluminate cement clinker is shown in Table 2.

[0038] Table 2 Mineral composition of high calcium and high iron belite sulphoaluminate cement clinker

[0039]

[0040] Preparation of integrated cementitious material in Example 2

[0041] The components were added into a dry powder mixer in the proportions shown in Table 3, and were mixed uniformly to obtain the integrated cementitious material.

[0042] Table 3: Proportions of integrated cementitious material

[0043]

[0044] The physical properties of the above-mentioned integrated cementitious materials were determined using the standard GB 17671-2021 "Cement mortar strength test method (ISO method)", GB / T 1346-2011 "Cement standard consistency water consumption, setting time, and stability test method", and the results are shown in Table 4.

[0045] Table 4: Physical properties of integrated cementitious material

[0046]

[0047] As can be seen from Table 4, the integrated cementitious materials of Group No. 1-Group No. 5 have a 3d strength of about 20.0 MPa and a 28d compressive strength of about 41.5 MPa, with relatively good strength and development regularity; the integrated cementitious material of Group No. 6, which does not add high-calcium high-iron belite sulphoaluminate cement clinker to excite the activity of mineral admixtures, has a 3d strength of only 12.3 MPa and a 28d strength of only 38.5 MPa, which is significantly lower than that of the integrated cementitious materials of Group No. 1-Group No. 5. This fully proves the significant excitation effect of high-calcium high-iron belite sulphoaluminate cement clinker on the activity of mineral admixtures, and also confirms the superior performance of the integrated cementitious material in the present application.

[0048] Preparation of low-carbon concrete in Example 3

[0049] In this embodiment, the cementitious material is an integrated cementitious material prepared according to Group No. 2 in Table 3, and the addition ratio of Portland cement clinker in the integrated cementitious material is 36%; the fine aggregate is a medium-grade machine-made sand with a fineness number of 2.5; the coarse aggregate is a stone aggregate with a continuous gradation of particle sizes of 5-25 mm; the water reducing agent is a polycarboxylic acid superplasticizer with a solid content of 20% liquid agent, and the water reducing rate is greater than 30%; and the strength grade of the low-carbon concrete is designed as C30, C40, C50, and C60. The integrated cementitious material: 360-520 parts; the fine aggregate: 800-900 parts; the coarse aggregate: 1100-1200 parts; the water reducing agent: 7.0-9.0 parts; and the water: 160-180 parts.

[0050] Group No. 1:

[0051] The raw materials are weighed as follows: 360 parts of integrated cementitious material, 800 parts of fine aggregate, 1100 parts of coarse aggregate, 7.0 parts of water reducing agent, and 180 parts of water.

[0052] The preparation method is as follows: the integrated cementitious material, the fine aggregate, and the coarse aggregate are poured into a mixer and stirred for 1 minute to mix them evenly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the low-carbon concrete.

[0053] Group No. 2:

[0054] The raw materials are weighed as follows: 410 parts of integrated cementitious material, 900 parts of fine aggregate, 1180 parts of coarse aggregate, 7.5 parts of water reducing agent, and 170 parts of water.

[0055] The preparation method is as follows: the integrated cementitious material, the fine aggregate, and the coarse aggregate are poured into a mixer and stirred for 1 minute to mix them evenly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the low-carbon concrete.

[0056] Group No. 3:

[0057] The raw materials are weighed as follows: 480 parts of integrated cementitious material, 851 parts of fine aggregate, 1200 parts of coarse aggregate, 8.0 parts of water reducing agent, and 175 parts of water.

[0058] The preparation method is as follows: the integrated cementitious material, the fine aggregate, and the coarse aggregate are poured into a mixer and stirred for 1 minute to mix them evenly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the low-carbon concrete.

[0059] Group No. 4:

[0060] The raw materials are weighed as follows: 520 parts of integrated cementitious material, 800 parts of fine aggregate, 1100 parts of coarse aggregate, 9.0 parts of water reducing agent, and 160 parts of water.

[0061] The preparation method is as follows: the integrated cementitious material, the fine aggregate, and the coarse aggregate are poured into a mixer and stirred for 1 minute to mix them evenly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the low-carbon concrete.

[0062] In order to fully embody the performance advantage of the low-carbon concrete of the present application, the concrete prepared by the traditional method using P.O42.5 cement and mineral admixture as cementitious material is compared synchronously. In the concrete, the proportion of Portland cement clinker in the composition is 70%, the proportion of desulfurization gypsum and other mineral admixtures is 30%, the 3d strength is 26.0 MPa, and the 28d strength is 50.0 MPa; the mineral admixture used is: the specific surface area of Ⅱ fly ash is 320 m 2 / kg, and the specific surface area of slag powder is 420 m 2 / kg.

[0063] Comparative Example 1

[0064] The raw materials are weighed as follows: P.O42.5 cement 216 parts; Ⅱ fly ash 72 parts; slag powder 72 parts; fine aggregate 795 parts; coarse aggregate 996 parts; water reducing agent 6.0 parts; and water 160 parts.

[0065] The preparation method is as follows: the P.O42.5 cement, Ⅱ fly ash, slag powder, fine aggregate and coarse aggregate are poured into a mixer and stirred for 1 minute to mix uniformly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the Comparative Example 1 concrete.

[0066] Comparative Example 2

[0067] The raw materials are weighed as follows: P.O42.5 cement 246 parts; Ⅱ fly ash 82 parts; slag powder 82 parts; fine aggregate 762 parts; coarse aggregate 980 parts; water reducing agent 6.5 parts; and water 157 parts.

[0068] The preparation method is as follows: the P.O42.5 cement, Ⅱ fly ash, slag powder, fine aggregate and coarse aggregate are poured into a mixer and stirred for 1 minute to mix uniformly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the Comparative Example 2 concrete.

[0069] Comparative Example 3

[0070] The raw materials are weighed as follows: P.O42.5 cement 288 parts; Ⅱ fly ash 96 parts; slag powder 96 parts; fine aggregate 751 parts; coarse aggregate 954 parts; water reducing agent 7.0 parts; and water 154 parts.

[0071] The preparation method is as follows: the P.O42.5 cement, Ⅱ fly ash, slag powder, fine aggregate and coarse aggregate are poured into a mixer and stirred for 1 minute to mix uniformly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain the Comparative Example 3 concrete.

[0072] Comparative Example 4

[0073] The raw materials are weighed as follows: P.O 42.5 cement 312 parts; II fly ash 104 parts; slag powder 104 parts; fine aggregate 780 parts; coarse aggregate 902 parts; water reducing agent 8.0 parts, and water 150 parts.

[0074] The preparation method is as follows: P.O 42.5 cement, II fly ash, slag powder, fine aggregate, and coarse aggregate are poured into a mixer and stirred for 1 minute to mix uniformly; the water reducing agent is mixed into water and fully mixed, and then poured into the above mixture and stirred for 2-5 minutes to obtain Comparative Example 4 concrete.

[0075] According to GB / T 50080-2016 "Standard Test Methods for Properties of Fresh Ordinary Concrete" and GB / T 50081-2019 "Standard Test Methods for Mechanical Properties of Fresh Ordinary Concrete", the concrete prepared in the above examples and comparative examples is determined for slump, spread, and 3d, 7d, and 28d compressive strength, and the results are shown in Table 5:

[0076] Table 5: Working performance and mechanical properties of low-carbon concrete of each group

[0077]

[0078] As can be seen from Table 5, compared with the concrete (Comparative Examples 1-4) prepared by the traditional method, the performance of the low-carbon concrete (Group 1-Group 4) of each embodiment of the present application is compared, and the concrete of different strength grades (C30-C60) is prepared, and under the condition that the slump of the concrete is basically the same, the strength of the corresponding grade of concrete at each age is improved by 2-4 MPa, the spread is improved by 60-80 mm, the improvement degree is 10-15%, and the performance is better. Compared with the concrete prepared by the traditional method, the cement clinker content in the low-carbon concrete (C30-C60) is reduced by 14.3%, i.e. the carbon emission intensity of the concrete is reduced by 14.3%, which is a truly low-carbon concrete.

[0079] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions described in the foregoing examples can be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-performance low-carbon concrete, characterized by: The invention is composed of the following raw materials in parts by weight: integrated cementitious material: 360-520 parts; fine aggregate: 800-900 parts; coarse aggregate: 1100-1200 parts; water reducing agent: 7.0-9.0 parts; water: 160-180 parts; The integrated cementitious material is obtained by dry-mixing the following raw materials in parts by weight: 35-40 parts of Portland cement clinker powder; 5-6 parts of high-calcium and high-iron belite sulphoaluminate cement clinker powder; 5-10 parts of fine limestone powder; 14-20 parts of ground fly ash; 10-15 parts of slag powder; 10-15 parts of steel slag powder; and 5-10 parts of coarse limestone powder. The high calcium and high iron belite sulphoaluminate cement clinker powder is obtained by grinding high calcium and high iron belite sulphoaluminate cement clinker to a specific surface area of ​​380-400 m 2 / kg obtained; The batching parameters of the high-calcium, high-iron, high-belite sulphoaluminate cement clinker are: alkalinity coefficient Cm value is 1.60-1.65, fCaO is 0.5-1.0%, and fSO3 is 0.5-1.0%; the mineral composition of the high-calcium, high-iron, high-belite sulphoaluminate cement clinker is calculated by weight percentage: C2S mineral content is 50-60%, The mineral content is 20~25%, the mineral content of C6AF2 is 10-15%, and the C 12 A7 mineral content is 5-10%.

2. The high performance low carbon concrete according to claim 1, characterized in that: The Portland cement clinker powder is obtained by grinding 95% of ordinary Portland cement clinker and 5% of desulfurized gypsum together, with a specific surface area of ​​380-400 m 2 / kg.

3. The high performance low carbon concrete according to claim 1, characterized in that: The fine limestone powder is obtained by ultra-fine grinding of limestone, with a specific surface area of ​​800-900m 2 / kg.

4. The high performance low carbon concrete according to claim 1, characterized in that: The ground fly ash is obtained by grinding the original fly ash separately, and the specific surface area is 500-550m 2 / kg.

5. The high performance low carbon concrete according to claim 1, characterized in that: The slag powder is obtained by grinding water-quenched slag separately, and has a specific surface area of ​​550-600m 2 / kg.

6. The high performance low carbon concrete according to claim 1, characterized in that: The steel slag powder is obtained by grinding converter steel slag separately, and has a specific surface area of ​​450-500m 2 / kg.

7. The high performance low carbon concrete according to claim 1, characterized in that: The coarse limestone powder is obtained by grinding limestone separately, and has a specific surface area of ​​150-200m 2 / kg.

8. The high performance low carbon concrete according to claim 1, characterized in that: The fine aggregate is medium-grade machine-made sand with a fineness of 2.

5.

9. The high performance low carbon concrete according to claim 1, characterized in that: The coarse aggregate is continuously graded stone with a particle size of 5-25 mm.

10. The high performance low carbon concrete according to claim 1, characterized in that: The water reducer is a polycarboxylic acid high-efficiency water reducer, a liquid agent with a solid content of 20% and a water reduction rate of greater than 30%.

11. A method for preparing high-performance low-carbon concrete according to claim 1, characterized in that: The steps include: 1) Weigh the integrated cementitious material, fine aggregate, coarse aggregate, water reducer and water according to the formula; 2) Pour the weighed integrated cementitious material, fine aggregate, and coarse aggregate into a blender and stir until uniform to obtain a mixture; 3) Mix the weighed water reducer into water and mix it thoroughly, then pour it into the above mixture and continue stirring to obtain low-carbon concrete.

Images