A Grading Optimization Method for Sand and Gravel Aggregate

A technology of grading optimization and aggregates, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. It can solve the problems of single, unreasonable, and incapable evaluation methods, and simplify the sand and gravel adjustment steps. , reduce the amount of glue material, improve the effect of easy performance

Active Publication Date: 2022-03-18
中建西部建设新疆有限公司 +1
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Problems solved by technology

[0003] At present, the optimization design of general aggregate grading of sand and gravel is mainly based on the theory of maximum compactness and minimum porosity, and strives to form a concrete mixture with good working performance with the minimum mortar volume (completely wrapping the aggregate) and the maximum aggregate volume; However, the design method involved is relatively simple, and the simple pursuit of the smallest porosity, the largest density, the preparation process is cumbersome, and the evaluation method is single and there is a certain irrationality.
At present, there are three methods related to the evaluation of the quality of aggregate grading: porosity, aggregate fineness modulus, and the limitation of the cumulative sieve range of different grading intervals in the standard. The corresponding technical problems are as follows: 1 ) porosity evaluation, can only give the result of the final porosity of the aggregate, explain the compactness of the aggregate accumulation, and cannot give a specific optimization method if the porosity is high and the gradation is poor; 2) The fineness modulus of the aggregate Currently, this method is only used for fine aggregate (sand), and the overall average thickness of sand aggregate can only be calculated by inserting the cumulative sieve residue of different nominal particle sizes into the formula as a single variable, and it cannot determine the quality of sand aggregate. The advantages and disadvantages of the continuous distribution of grading; 3) For the limitation of the cumulative sieve range of different grading intervals in the standard, only a wide range of cumulative sieves with different nominal particle sizes of aggregates is given, and no specific Evaluation method of aggregate grading and how to optimize grading if it is out of range

Method used

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  • A Grading Optimization Method for Sand and Gravel Aggregate
  • A Grading Optimization Method for Sand and Gravel Aggregate
  • A Grading Optimization Method for Sand and Gravel Aggregate

Examples

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Embodiment 1

[0022] A method for optimizing the gradation of sand and gravel aggregates, comprising the steps of:

[0023] 1) For aggregates of 0-5mm (nominal particle size), the aggregates to be optimized are screened with 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, and 0.15mm standard sieves to obtain different particle size intervals The graded aggregate (6 grades) of the graded aggregate of grade i, where the ratio of sub-metered and sieved aggregate of grade i is p i , the corresponding sieve side length is d i , and i is numbered sequentially according to the increasing particle size; the specific screening results are shown in Table 1;

[0024] 2) According to the sieving results described in Table 1, according to the formula SG m =∑d i p i Calculate the initial gradation continuity coefficient SG of sand and gravel aggregate 0 =(4.75×23%+2.36×8%+1.18×24%+0.6×19%+0.3×11%+0.15×10%)=1.7;

[0025] 3) Calculated initial gradation continuity coefficient SG 0 Greater than aggregate targe...

Embodiment 2

[0041] A method for optimizing the gradation of sand and gravel aggregates, comprising the steps of:

[0042] 1) For aggregates of 5-20mm (nominal particle size), the aggregates to be optimized are screened with 19mm, 16mm, 9.5mm, and 4.75mm standard sieves to obtain graded aggregates in different particle size ranges (4 grades) , where the proportion of sub-calculated and sieved aggregate of grade i is p i , the corresponding sieve side length is d i , and i is numbered in order of increasing particle size; the specific screening results are shown in Table 5;

[0043] 2) according to the screening result described in table 5, according to the formula SG x =∑d i p i Calculation of Gradation Continuity Coefficient SG of Sand and Gravel Aggregate x ; Calculated initial gradation continuity coefficient SG 0 =(19.0×13%+16.0×15%+9.5×37%+4.75×30%)=9.8; within the standard range (9.0-10.5) of sandstone aggregate gradation continuity coefficient sand in Table 1, the gradation op...

Embodiment 3

[0048] A method for optimizing the gradation of sand and gravel aggregates, comprising the steps of:

[0049] 1) For coarse aggregates of 5-25mm (nominal particle size), the aggregates to be optimized are sieved with 26.5mm, 19.0mm, 16.0mm, 9.5mm, 4.75mm standard sieves to obtain the classification of different particle size intervals Aggregate (grade 5), where the ratio of sub-calculation and sieve residue of grade i graded aggregate is p i , the corresponding sieve side length is d i , and i is numbered in order of increasing particle size; the specific screening results are shown in Table 6;

[0050] 2) according to the screening result described in table 6, according to the formula SG m =∑d i p i Calculate the initial gradation continuity coefficient SG of sand and gravel aggregate 0 =(26.5×1%+19.0×17%+16.0×15%+9.5×37%+4.75×22%)=10.5;

[0051] 3) Calculated preliminary gradation continuity coefficient SG 0 Smaller than aggregate target grading continuity coefficient...

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Abstract

The invention discloses a method for optimizing the gradation of sand and gravel aggregates. Firstly, the sand and gravel aggregates are screened to obtain the side length of the sieve holes corresponding to aggregates of all levels as d i Calculate the gradation continuity coefficient SG of sand and gravel aggregate by using the obtained sieving information m , and with the target value of the gradation continuous coefficient SG 标 For comparison, the gradation conditions of sand and gravel aggregates are evaluated to guide the subsequent gradation adjustment process. The present invention designs a scientific and reasonable evaluation method for the continuous coefficient of aggregate gradation, which can simultaneously evaluate and adjust the overall thickness of the aggregate and the continuous distribution state of the aggregate gradation, so as to quickly optimize the aggregate gradation, and effectively Improve the quality of aggregate gradation; and the optimization process involved is simple, easy to operate, wide applicability, can effectively guide the production of sand and gravel aggregates, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a sandstone aggregate gradation optimization method. Background technique [0002] Modern concrete is mainly in a large flow state, and the requirements for the workability of concrete are getting higher and higher, and objectively, the requirements for the quality of sand and gravel aggregates are also getting higher and higher. At present, the quality of sand and gravel in my country is generally poor, mainly reflected in poor particle shape and poor gradation, which in turn leads to problems such as large amount of concrete cementitious materials and large water consumption. Moreover, due to the large fluctuations in the quality of the sand and gravel used in production, problems such as pipe plugging, segregation, and bleeding of concrete frequently occurred during the construction process. The quality of aggregate has become the bottleneck of the deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/00C04B18/12
CPCC04B20/0076C04B18/12Y02W30/91
Inventor 艾洪祥卢霄张平王军古龙龙苏温馨
Owner 中建西部建设新疆有限公司
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