An optimization method of mineral material grading based on mineral material gap ratio

A technology of gradation optimization and void ratio, which is applied to cohesive pavement paved on site, roads, roads, etc., can solve the problem that the optimal asphalt ratio is far apart, VMA and void ratio are difficult to meet the specification requirements, and gradation optimization has no Realize and other problems, to achieve the effect of accurate and reasonable calculation value, saving engineering cost and shortening the design cycle

Active Publication Date: 2018-04-10
CHANGAN UNIV
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Problems solved by technology

However, there are two problems in doing so: one is that if the initially selected gradation VMA is unqualified, a large number of Marshall tests need to be done, which leads to prolonging the design cycle of asphalt concrete mix ratio and increasing the workload of testers; The estimated asphalt-aggregate ratio is an empirical value, which is often far from the optimal asphalt-aggregate ratio. It not only cannot reflect the close relationship between the optimal asphalt-aggregate ratio and the gradation, but also cannot truly reflect the internal void distribution of the mixture when the asphalt-aggregate ratio is optimal. Therefore, the VMA and porosity of the Marshall specimens formed under the estimated asphalt-stone ratio are difficult to meet the specification requirements, that is, the optimization of the gradation has not really been realized.

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  • An optimization method of mineral material grading based on mineral material gap ratio
  • An optimization method of mineral material grading based on mineral material gap ratio
  • An optimization method of mineral material grading based on mineral material gap ratio

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Embodiment 1

[0036] In this embodiment, the mineral material gradation optimization method based on the mineral material gap ratio includes the following steps:

[0037] Step 1. Sieve the mineral material to obtain n grades of graded mineral materials with different particle sizes, wherein the particle size of the i-th graded mineral material is d i , the mass passing percentage of grade i graded mineral material is m i ; The i=1, 2, 3, ..., n, n is a natural number greater than 4;

[0038] The gradation composition of the mineral material in this embodiment is shown in Table 1.

[0039] Table 1 Gradation Composition (Quality Parameters) of Mineral Materials in Example 1

[0040]

[0041] As can be seen from Table 1, the mineral material gradation in this embodiment includes n=11 different particle sizes, wherein the maximum particle size is 16mm, and the minimum particle size is 0.005mm;

[0042] Step 2, passing the mass of the i-th grade graded mineral material described in step 1 ...

Embodiment 2

[0065] In this embodiment, the mineral material gradation optimization method based on the mineral material gap ratio includes the following steps:

[0066] Step 1: Sieve the mineral material to obtain n grades of graded mineral materials with different particle sizes, and the particle size of the i grade graded mineral material is d i , the mass passing percentage of grade i graded mineral material is m i ; The i=1, 2, 3, ..., n, n is a natural number greater than 4;

[0067] The gradation composition of the mineral material in this embodiment is shown in Table 6.

[0068] Table 6 The gradation composition (quality parameters) of the ore material in Example 2

[0069]

[0070] As can be seen from Table 6, the mineral material gradation of this embodiment includes n=11 different particle sizes, wherein the maximum particle size is 16mm, and the minimum particle size is 0.005mm;

[0071] Step 2, passing the mass of the i-th grade graded mineral material described in step ...

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Abstract

The invention provides a mineral material gradation optimization method based on the mineral material gap ratio, comprising the following steps: 1. Screening the mineral material to obtain graded mineral materials with multi-level different particle sizes; 2. Step 1 The mass passage percentages of all levels of mineral materials mentioned in the above are converted into volume passage percentages; 3. Iterative calculation is performed to obtain the interstitial ratio of the mixed mineral materials; 4. The mineral material gradation is optimized according to the interstitial ratio of the mixed mineral materials. The present invention fully considers the engineering reality, and can reasonably estimate the gap ratio of the mineral material without compacting the mixture test piece in the early stage to optimize the gradation, greatly reducing the workload and blindness of the mixing ratio design stage, and significantly Improve engineering efficiency.

Description

technical field [0001] The invention belongs to the technical field of highway and urban road design, and in particular relates to a mineral material gradation optimization method based on the mineral material gap ratio. Background technique [0002] Asphalt mixture is a three-phase system consisting of asphalt binder, aggregate and voids. The design idea of ​​traditional asphalt mixture gradation design methods (such as Marshall method) and some new gradation design methods (such as Bailey method) is to rationally adjust the composition ratio of the three-phase system to make the asphalt mixture To obtain a suitable volume composition, its characterization indicators include mineral void ratio (VMA), residual void ratio (VV) and bitumen void fraction (VFA). In the case of a certain residual void ratio, the performance of asphalt mixture depends on the mineral aggregate void ratio to a large extent. Therefore, VMA is a very important volume parameter in the design of hot m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/18
CPCE01C7/182
Inventor 郝培文徐金枝陈治君王春汪海年张铭铭
Owner CHANGAN UNIV
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