Calculation method for determining filling volume rate of road concrete coarse aggregate based on sand rate
Patent Information
- Application Number
- CN202611104801.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-24
- Publication Date
- 2026-10-16
AI Technical Summary
[0005]本发明所要解决的技术问题是针对现行规范及规程中缺少适用于水泥混凝土配合比设计中关键参数粗集料填充体积率计算方法的问题，结合现行规范及实践，提供基于砂率确定路用混凝土粗集料填充体积率的计算方法，该方法通过建立砂率与粗集料填充状态之间的数学关系，实现了粗集料填充体积率的快速、精准计算
（1）本发明提供了一种基于砂率确定路用混凝土粗集料填充体积率的计算方法，该方法基于砂率确定粗集料填充体积率的理论计算公式，能够简便快捷的计算出粗集料填充体积率，快速判断配合比设计是否满足规范要求，填补了现行规范中粗集料填充体积率缺乏系统计算方法的空白，为路用水泥混凝土配合比设计提供了科学依据。
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of road engineering technology, specifically relating to a calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio. Background Technology
[0002] During the formation of flexural strength in cement concrete pavement, coarse aggregate provides a strong interlocking effect, which has a crucial impact on the mechanical properties and durability of concrete pavement. The "Technical Specification for Construction of Cement Concrete Pavement of Highways" (JTGF30-2003), referencing the Japanese "Guidelines for Design and Construction of Cement Concrete Pavement," requires that after the mix design calculations for cement concrete pavement are completed, the volume fraction of coarse aggregate filling should be verified to be no less than 70%.
[0003] The "Technical Specification for Construction of Cement Concrete Pavement on Highways" (JTG F30-2003) defines the concept of coarse aggregate filling volume ratio: calculated using the density method or volume method, the coarse aggregate filling volume ratio = the amount of coarse aggregate per cubic meter of concrete divided by its apparent density. Verification using this method yields a coarse aggregate filling volume ratio of approximately 44%~48%, far less than the 70% required by the specification, and this specification is now obsolete. The current "Detailed Technical Specifications for Construction of Cement Concrete Pavement on Highways" (JTG / T F30-2014) states that the calculated mix proportion should be verified for a coarse aggregate filling volume ratio, which should not be less than 70%. However, this specification does not provide a specific calculation method for the coarse aggregate filling volume ratio, nor does it offer more detailed explanations. For roller-compacted concrete mix design, it only provides the applicable range for the coarse aggregate filling volume ratio, based on different sand fineness moduli M. x For different percentages of coarse aggregate filling volume, no specific calculation method is given. In addition, the "Specifications for Testing Aggregates in Highway Engineering" (JTG 3422-2024) provides test and calculation methods for the coarse aggregate skeleton void ratio under compacted concrete sample conditions. The coarse aggregate skeleton void ratio is the percentage of the volume of voids between coarse aggregate particles to the total volume of coarse aggregate, which is a significantly different concept from the coarse aggregate filling volume ratio. Therefore, it is not applicable to the calculation of the coarse aggregate filling volume ratio.
[0004] As can be seen from the above, there is currently no clear calculation method for the volume ratio of coarse aggregate filling. Summary of the Invention
[0005] The technical problem to be solved by this invention is the lack of a method for calculating the coarse aggregate filling volume ratio, a key parameter in cement concrete mix design, in current specifications and regulations. Combining current specifications and practices, this invention provides a method for determining the coarse aggregate filling volume ratio of road concrete based on the sand ratio. This method achieves rapid and accurate calculation of the coarse aggregate filling volume ratio by establishing a mathematical relationship between the sand ratio and the coarse aggregate filling state.
[0006] To achieve the above objectives, according to one aspect of the present invention, a method for calculating the coarse aggregate filling volume ratio of road concrete based on sand ratio is provided, comprising: The design parameters and raw material parameters of the target concrete are obtained. The design parameters include concrete type and slump index, and the raw material parameters include coarse aggregate type, fine aggregate type, sand fineness modulus and apparent density of coarse aggregate. Based on the concrete type, coarse aggregate type, fine aggregate type, and sand fineness modulus, the sand ratio parameter is determined by querying the preset sand ratio correspondence table, and a sand ratio is initially selected from the sand ratio parameters. Based on the concrete type, the corresponding mix design specifications are called to complete the preliminary mix design, and the mass of coarse aggregate, fine aggregate, cementitious material, and water in the unit volume of concrete is obtained. Based on the initially selected sand ratio, the mass of the coarse aggregate, and the apparent density of the coarse aggregate, the coarse aggregate filling volume ratio is calculated. The coarse aggregate filling volume ratio is compared with a preset standard threshold, and the rationality of the mix proportion is determined based on the comparison result.
[0007] In the above scheme, the concrete type includes ordinary concrete and high slump concrete.
[0008] In the above scheme, the slump index corresponding to the ordinary concrete is 10~70mm; the slump index corresponding to the high slump concrete is 120~180mm.
[0009] In the above scheme, when the concrete type is ordinary concrete, a sand ratio is initially selected based on the type of coarse aggregate and the fineness modulus of the sand, according to the corresponding sand ratio parameter in a preset sand ratio correspondence table; the preset sand ratio correspondence table is the first sand ratio table, and the step of querying and determining the sand ratio parameter includes: If the coarse aggregate is crushed stone, refer to the following relationship: The fineness modulus of the sand is in the range of 2.2 to 2.5, and the sand ratio is 30% to 34%. The fineness modulus of the sand is in the range of 2.5 to 2.8, and the sand ratio is 32% to 36%. The fineness modulus of the sand is in the range of 2.8 to 3.1, and the sand ratio is 34% to 38%. The fineness modulus of the sand is in the range of 3.1 to 3.4, and the sand ratio is 36% to 40%. The fineness modulus of the sand is in the range of 3.4 to 3.7, and the sand ratio parameter is 38% to 42%. The preset sand ratio correspondence table is the first sand ratio table as follows: Table 1 First Sand Ratio Table
[0010] If the coarse aggregate is pebbles, refer to the following relationship: The fineness modulus of the sand is in the range of 2.2 to 2.5, and the sand ratio parameter is 28% to 32%. The fineness modulus of the sand is in the range of 2.5 to 2.8, and the sand ratio parameter is 30% to 34%. The fineness modulus of the sand is in the range of 2.8 to 3.1, and the sand ratio is 32% to 36%. The fineness modulus of the sand is in the range of 3.1 to 3.4, and the sand ratio is 34% to 38%. The fineness modulus of the sand is in the range of 3.4 to 3.7, and the sand ratio parameter is 36% to 40%.
[0011] The preset sand ratio correspondence table is the second sand ratio table as follows: Table 2 Second Sand Ratio Table
[0012] In the above scheme, when the concrete type is high-slump concrete, a sand ratio is initially selected based on the fine aggregate type and the sand fineness modulus, according to the corresponding sand ratio parameter in a preset sand ratio correspondence table; the preset sand ratio correspondence table is a second sand ratio table, and the step of querying and determining the sand ratio parameter includes: If the fine aggregate is natural sand, refer to the following relationship: The fineness modulus of the sand is in the range of 2.3 to 2.6, and the sand ratio is 34% to 38%. The fineness modulus of the sand is in the range of 2.6 to 2.9, and the sand ratio is 36% to 40%. The fineness modulus of the sand is in the range of 2.9 to 3.2, and the sand ratio is 38% to 42%. If the fine aggregate is manufactured sand or mixed sand, refer to the following relationship: The fineness modulus of the sand is in the range of 2.3 to 2.6, and the sand ratio is 36% to 40%. The fineness modulus of the sand is in the range of 2.6 to 2.9, and the sand ratio parameter is 38% to 42%. The fineness modulus of the sand is in the range of 2.9 to 3.2, and the sand ratio parameter is 40% to 44%.
[0013] In the above scheme, when the concrete type is ordinary concrete, the mix design specification is "Technical Specifications for Construction of Cement Concrete Pavement of Highway" (JTG / T F30-2014); when the concrete type is high slump concrete, the mix design specification is "Technical Specifications for Construction of High Slump Cement Concrete Pavement of Urban Roads" (T / CCIAT0092).
[0014] In the above scheme, the step of calculating the coarse aggregate filling volume ratio based on the sand ratio parameter, the mass of the coarse aggregate, and the apparent density of the coarse aggregate uses the following formula:
[0015] In the formula, The volume fraction of coarse aggregate is expressed as % (%). The mass of coarse aggregate in one cubic meter of concrete, expressed in kg. Sand ratio parameter, unit: % The apparent density of coarse aggregate, in kg / m³ 3 ; This is the correction factor for the apparent density of coarse aggregate.
[0016] In the above scheme, the apparent density correction coefficient of the coarse aggregate k The following formula is used to determine it:
[0017] In the formula The apparent density of coarse aggregate, ranging from 2500 to 2800 kg / m³. 3 The apparent density correction factor for coarse aggregates described in this invention Used to correct the effect of different apparent densities on the fill volume ratio.
[0018] In the above scheme, the preset standard threshold is set as follows: the coarse aggregate filling volume ratio for ordinary concrete is not less than 70%, and the coarse aggregate filling volume ratio for high slump concrete is not less than 65%.
[0019] The method in the above scheme further includes: If the coarse aggregate filling volume ratio does not meet the preset standard threshold, the selected values of the coarse aggregate dosage or sand ratio parameters in the preliminary mix design are adjusted, and the mix design and filling ratio calculation steps are repeated until the requirements are met. The adjustment process can be performed manually or automatically by a computer system. This invention also provides a calculation system for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio, comprising: The parameter acquisition module is used to acquire the design parameters and raw material parameters of the target concrete. The design parameters include the concrete type and slump index, and the raw material parameters include the type of coarse aggregate, the type of fine aggregate, the fineness modulus of sand, and the apparent density of coarse aggregate. The sand ratio determination module is used to determine the sand ratio parameters based on the concrete type, coarse aggregate type, fine aggregate type, and sand fineness modulus, according to a preset sand ratio correspondence table, and to initially select a sand ratio from the sand ratio parameters. The mix design module is used to call the corresponding mix design specification according to the concrete type, complete the preliminary mix design, and obtain the mass of coarse aggregate in a unit volume of concrete. The coarse aggregate filling volume ratio calculation module is used to calculate the coarse aggregate filling volume ratio based on the initially selected sand ratio, the mass of the coarse aggregate, and the apparent density of the coarse aggregate. The result determination module is used to compare the coarse aggregate filling volume ratio with a preset standard threshold and determine the rationality of the mix proportion based on the comparison result.
[0020] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: (1) This invention provides a calculation method for determining the coarse aggregate filling volume ratio of road concrete based on the sand ratio. This method is based on the theoretical calculation formula for determining the coarse aggregate filling volume ratio based on the sand ratio. It can easily and quickly calculate the coarse aggregate filling volume ratio and quickly determine whether the mix design meets the specifications. It fills the gap in the current specifications where there is no systematic calculation method for the coarse aggregate filling volume ratio, and provides a scientific basis for the mix design of road cement concrete.
[0021] (2) This invention introduces a coarse aggregate apparent density correction coefficient. k It fully considers the influence of different coarse aggregate apparent densities on the filling volume ratio, and has higher accuracy and engineering applicability compared with the simple volume ratio calculation in the existing specifications.
[0022] (3) The calculation method of the present invention is simple and quick. It only requires conventional parameters in the mix design (mass of coarse aggregate, sand ratio, apparent density of coarse aggregate) to complete the calculation. No additional tests are required, which makes it convenient for engineering technicians to quickly verify and use in mix design. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0024] It should be understood that the sequence number of each step in the embodiment does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0025] Example 1 This embodiment takes the mix design of cement concrete pavement in a highway project as an example, and uses ordinary concrete for pavement construction.
[0026] Step 1: Obtain the raw material parameters and design specifications of the target concrete. The raw material parameters include the type of coarse aggregate, the type of fine aggregate, the fineness modulus of sand, and the apparent density of coarse aggregate. The design specifications include the type of concrete and the slump index. The concrete type includes ordinary concrete and high slump concrete.
[0027] Specifically, in this embodiment, based on the highway performance requirements of the target concrete, the slump index of cement concrete is selected as 10-70mm (ordinary concrete). The fine aggregate used is manufactured sand with a fineness modulus of 3.4-3.7; the coarse aggregate used is crushed stone.
[0028] Step 2: Based on the concrete type, coarse aggregate type, fine aggregate type, and sand fineness modulus, determine the sand ratio parameter by referring to the preset sand ratio correspondence table, and initially select a sand ratio from the sand ratio parameters.
[0029] In this embodiment, according to Table 1, the coarse aggregate is crushed stone, the sand fineness modulus is 3.1~3.4, and the corresponding sand ratio parameter is 36%~40%. A sand ratio is initially selected. =38%.
[0030] Table 1 First Sand Ratio Table
[0031] Step 3: Based on the type of concrete, call the corresponding mix design specifications to complete the preliminary mix design and obtain the mass of coarse aggregate, fine aggregate, cementitious material, and water per unit volume of concrete.
[0032] In this embodiment, following the mix design steps specified in Section 4.2 of the "Technical Specifications for Construction of Cement Concrete Pavement of Highways" (JTG / T F30-2014), the following material quantities per cubic meter of concrete were obtained through trial mixing: mass of coarse aggregate. =1090kg, mass of fine aggregate m s =670kg, mass of cementitious material m j =400kg, water mass m w =140kg. Apparent density of coarse aggregate. The test result was 2500 kg / m³. 3 .
[0033] Step 4: Based on the initially selected sand ratio, coarse aggregate mass and apparent density, calculate the coarse aggregate filling volume ratio.
[0034] In this embodiment, the step of calculating the coarse aggregate filling volume ratio uses the following formula:
[0035] In the formula, This represents the coarse aggregate filler volume fraction, expressed in % %. The mass of coarse aggregate in one cubic meter of concrete, expressed in kg. Sand ratio parameter, unit: % The apparent density of coarse aggregate, in kg / m³ 3 ; This is the correction factor for the apparent density of coarse aggregate.
[0036] Coarse aggregate apparent density correction factor k The following formula is used to determine it:
[0037] In the formula The apparent density of the coarse aggregate is 2500 kg / m³. 3 .
[0038] Specifically, in this embodiment
[0039] We can obtain:
[0040] Step 5. Compare the coarse aggregate filling volume ratio with the preset standard threshold, and determine the rationality of the mix proportion based on the comparison results.
[0041] In this embodiment, the calculated coarse aggregate filling volume ratio is 66.57%, which does not meet the requirement that the coarse aggregate filling volume ratio for ordinary concrete should not be less than 70%. Therefore, it is necessary to adjust the coarse aggregate dosage or sand ratio parameters in the preliminary mix design and re-execute the mix design and filling rate calculation steps until the requirements are met.
[0042] Specifically, in this embodiment, the selected value of the sand ratio parameter is adjusted, and the sand ratio is selected again. =36%. Following step 3, a new concrete mix design can be obtained by re-mixing the coarse aggregate. m g =1190kg, mass of fine aggregate m s =670kg, cementitious material mass m j =400kg, mass of water m w =140kg.
[0043] Recalculate the coarse aggregate filler volume ratio:
[0044] The calculated coarse aggregate filling volume ratio is 74.94%, which is greater than 70% and meets the specification requirements, so there is no need to adjust the mix proportion.
[0045] Example 2 This embodiment uses high-slump concrete for road paving, taking into account the road performance of urban roads.
[0046] Step 1: Obtain the raw material parameters and design specifications of the target concrete. The raw material parameters include the type of coarse aggregate, the type of fine aggregate, the fineness modulus of sand, and the apparent density of coarse aggregate. The design specifications include the type of concrete and the slump index. The concrete type includes ordinary concrete and high slump concrete.
[0047] Specifically, in this embodiment, based on the urban road performance of the target concrete, the slump index of the cement concrete is selected as 120-180mm (high slump concrete). The fine aggregate used is manufactured sand with a fineness modulus of 2.6-2.9; the coarse aggregate used is crushed stone.
[0048] Step 2: Based on the concrete type, coarse aggregate type, fine aggregate type, and sand fineness modulus, determine the sand ratio parameter by referring to the preset sand ratio correspondence table, and initially select a sand ratio from the sand ratio parameters.
[0049] In this embodiment, according to Table 2, the fine aggregate is manufactured sand with a fineness modulus of 2.6 to 2.9, corresponding to a sand ratio parameter of 38% to 42%. A sand ratio is initially selected. =39%.
[0050] Table 2
[0051] Step 3: Based on the type of concrete, call the corresponding mix design specifications to complete the preliminary mix design and obtain the mass of coarse aggregate, fine aggregate, cementitious material, and water per unit volume of concrete.
[0052] In this embodiment, the cement concrete mix design was completed according to the mix design steps in Section 5 of the "Technical Specification for Construction of High Slump Cement Concrete Pavement for Urban Roads" (T / CCIAT0092). The following material quantities per cubic meter of concrete were obtained through trial mixing: mass of coarse aggregate... =1071kg, mass of fine aggregate m s =685kg, mass of cementitious material m j =467kg, water mass m w =168kg. Apparent density of coarse aggregate. The test result was 2600 kg / m³. 3 .
[0053] Step 4: Based on the initially selected sand ratio, coarse aggregate mass and apparent density, calculate the coarse aggregate filling volume ratio.
[0054] In this embodiment, the step of calculating the coarse aggregate filling volume ratio uses the following formula:
[0055] In the formula, This represents the coarse aggregate filler volume fraction, expressed in % %. The mass of coarse aggregate in one cubic meter of concrete, expressed in kg. Sand ratio parameter, unit: % The apparent density of coarse aggregate, in kg / m³ 3 ; This is the correction factor for the apparent density of coarse aggregate.
[0056] Coarse aggregate apparent density correction factor k The following formula is used to determine it:
[0057] In the formula The apparent density of the coarse aggregate is 2600 kg / m³. 3 .
[0058] Specifically, in this embodiment
[0059] We can obtain:
[0060] Step 5. Compare the coarse aggregate filling volume ratio with the preset standard threshold, and determine the rationality of the mix proportion based on the comparison results.
[0061] In this embodiment, the calculated coarse aggregate filling volume ratio is 67.21%, which meets the requirement that the coarse aggregate filling volume ratio for high slump concrete should not be less than 65%, i.e., it meets the specification requirements, so there is no need to adjust the mix proportion.
[0062] In summary, this invention aims to solve the problem of lacking a key parameter for calculating the coarse aggregate filling volume ratio in the mix design of road cement concrete. Combining current specifications and practices, it proposes a calculation method for determining the coarse aggregate filling volume ratio of road concrete based on the sand ratio. This method can quickly determine whether the coarse aggregate filling volume ratio meets the specification limit after the mix design is completed, effectively improving the theoretical system of road cement concrete mix design. It has important theoretical significance and significant practical value for improving the scientificity, standardization, and engineering applicability of mix design.
[0063] It should be noted that, depending on the implementation needs, the various steps described in this application can be broken down into more steps, or two or more steps or parts of the steps can be combined into new steps to achieve the purpose of this invention.
[0064] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio, characterized in that, include: The design parameters and raw material parameters of the target concrete are obtained. The design parameters include concrete type and slump index, and the raw material parameters include coarse aggregate type, fine aggregate type, sand fineness modulus and apparent density of coarse aggregate. Based on the concrete type, coarse aggregate type, fine aggregate type, and sand fineness modulus, the sand ratio parameter is determined by querying the preset sand ratio correspondence table, and a sand ratio is initially selected from the sand ratio parameters. Based on the concrete type, the corresponding mix design specification is called to complete the preliminary mix design and obtain the mass of coarse aggregate in a unit volume of concrete. Based on the initially selected sand ratio, the mass of the coarse aggregate, and the apparent density of the coarse aggregate, the coarse aggregate filling volume ratio is calculated. The coarse aggregate filling volume ratio is compared with a preset standard threshold, and the rationality of the mix proportion is determined based on the comparison result.
2. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 1, characterized in that, The method further includes: If the coarse aggregate filling volume ratio does not meet the preset standard threshold, the selection value of the coarse aggregate dosage or sand ratio parameter in the preliminary mix design is adjusted, and the mix design and filling volume ratio calculation steps are re-executed until the requirements are met.
3. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 1, characterized in that, The concrete types include ordinary concrete and high-slump concrete.
4. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 3, characterized in that, The slump index corresponding to the ordinary concrete is 10~70mm; the slump index corresponding to the high slump concrete is 120~180mm.
5. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 3, characterized in that, When the concrete type is ordinary concrete, based on the type of coarse aggregate and the fineness modulus of sand, a sand ratio is initially selected according to the corresponding sand ratio parameter in a preset sand ratio correspondence table; the preset sand ratio correspondence table is the first sand ratio table, and the step of querying and determining the sand ratio parameter includes: If the coarse aggregate is crushed stone, refer to the following relationship: The fineness modulus of the sand is in the range of 2.2 to 2.5, and the sand ratio is 30% to 34%. The fineness modulus of the sand is in the range of 2.5 to 2.8, and the sand ratio is 32% to 36%. The fineness modulus of the sand is in the range of 2.8 to 3.1, and the sand ratio is 34% to 38%. The fineness modulus of the sand is in the range of 3.1 to 3.4, and the sand ratio is 36% to 40%. The fineness modulus of the sand is in the range of 3.4 to 3.7, and the sand ratio parameter is 38% to 42%. If the coarse aggregate is pebbles, refer to the following relationship: The fineness modulus of the sand is in the range of 2.2 to 2.5, and the sand ratio parameter is 28% to 32%. The fineness modulus of the sand is in the range of 2.5 to 2.8, and the sand ratio parameter is 30% to 34%. The fineness modulus of the sand is in the range of 2.8 to 3.1, and the sand ratio is 32% to 36%. The fineness modulus of the sand is in the range of 3.1 to 3.4, and the sand ratio is 34% to 38%. The fineness modulus of the sand is in the range of 3.4 to 3.7, and the sand ratio is 36% to 40%. When the concrete type is high-slump concrete, based on the fine aggregate type and the sand fineness modulus, a sand ratio is initially selected according to the corresponding sand ratio parameter in a preset sand ratio correspondence table; the preset sand ratio correspondence table is a second sand ratio table, and the step of querying and determining the sand ratio parameter includes: If the fine aggregate is natural sand, refer to the following relationship: The fineness modulus of the sand is in the range of 2.3 to 2.6, and the sand ratio is 34% to 38%. The fineness modulus of the sand is in the range of 2.6 to 2.9, and the sand ratio is 36% to 40%. The fineness modulus of the sand is in the range of 2.9 to 3.2, and the sand ratio is 38% to 42%. If the fine aggregate is manufactured sand or mixed sand, refer to the following relationship: The fineness modulus of the sand is in the range of 2.3 to 2.6, and the sand ratio is 36% to 40%. The fineness modulus of the sand is in the range of 2.6 to 2.9, and the sand ratio parameter is 38% to 42%. The fineness modulus of the sand is in the range of 2.9 to 3.2, and the sand ratio parameter is 40% to 44%.
6. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 3, characterized in that, When the concrete type is ordinary concrete, the mix design specification is "Technical Specifications for Construction of Cement Concrete Pavement on Highways" (JTG / T F30-2014); when the concrete type is high-slump concrete, the mix design specification is "Technical Specifications for Construction of High-Slump Cement Concrete Pavement on Urban Roads" (T / CCIAT 0092).
7. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 1, characterized in that, The step of calculating the coarse aggregate filling volume ratio based on the sand ratio parameter, the mass of the coarse aggregate, and the apparent density of the coarse aggregate uses the following formula: In the formula, This represents the coarse aggregate filler volume fraction, expressed in % %. The mass of coarse aggregate in one cubic meter of concrete, expressed in kg. Sand ratio parameter, unit: % The apparent density of coarse aggregate, in kg / m³ 3 ; This is the correction factor for the apparent density of coarse aggregate.
8. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 7, characterized in that, The apparent density correction factor of coarse aggregate k The following formula is used to determine it: In the formula The apparent density of coarse aggregate, ranging from 2500 to 2800 kg / m³. 3 .
9. The calculation method for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio according to claim 3, characterized in that, The preset standard thresholds are set as follows: the coarse aggregate filling volume ratio for ordinary concrete is not less than 70%, and the coarse aggregate filling volume ratio for high slump concrete is not less than 65%.
10. A calculation system for determining the coarse aggregate filling volume ratio of road concrete based on sand ratio, characterized in that, include: The parameter acquisition module is used to acquire the design parameters and raw material parameters of the target concrete. The design parameters include the concrete type and slump index, and the raw material parameters include the type of coarse aggregate, the type of fine aggregate, the fineness modulus of sand, and the apparent density of coarse aggregate. The sand ratio determination module is used to determine the sand ratio parameters based on the concrete type, coarse aggregate type, fine aggregate type, and sand fineness modulus, according to a preset sand ratio correspondence table, and to initially select a sand ratio from the sand ratio parameters. The mix design module is used to call the corresponding mix design specification according to the concrete type, complete the preliminary mix design, and obtain the mass of coarse aggregate in a unit volume of concrete. The coarse aggregate filling volume ratio calculation module is used to calculate the coarse aggregate filling volume ratio based on the initially selected sand ratio, the mass of the coarse aggregate, and the apparent density of the coarse aggregate. The result determination module is used to compare the coarse aggregate filling volume ratio with a preset standard threshold and determine the rationality of the mix proportion based on the comparison result.