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Method of applying limestone to lower-layer structure of double-layer drainage pavement

A pavement structure and limestone technology, applied in the direction of roads, roads, pavement details, etc., can solve the problems of performance degradation of the mixture, failure to effectively reduce construction costs, and low replacement rate, and achieve the effect of reducing construction costs

Active Publication Date: 2019-10-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The targeted replacement was not carried out according to the stress characteristics of each grade of aggregate in the mixture. As a result, either the replacement rate was too small to effectively reduce the construction cost; or the replacement was unreasonable, resulting in a significant drop in the performance of the mixture. decline

Method used

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  • Method of applying limestone to lower-layer structure of double-layer drainage pavement
  • Method of applying limestone to lower-layer structure of double-layer drainage pavement
  • Method of applying limestone to lower-layer structure of double-layer drainage pavement

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Experimental program
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Effect test

Embodiment

[0058] Step 1: Use 25mm PAC-10+40mm PAC-16 double-layer drainage pavement structure (where PAC-16 is used as the lower layer 2 of the double-layer drainage pavement structure), and the porosity of the upper and lower layers 1 and 2 are both 20%.

[0059] Step 2: According to the gradation of PAC-10 and PAC-16 mixture, the discrete element method is used to construct multiple sets of discrete element digital models of the double-deck drainage pavement structure, and determine the aggregate, mortar material parameters and related contact parameters.

[0060] Step 3: Apply boundary conditions (the bottom displacement is all zero, and the horizontal displacement on both sides is zero) and vertical load 4 to the above discrete element digital model, and obtain the load 4 in the PAC-16 of the double-deck drainage pavement substructure 2 Force chain 3 distribution ( figure 2 ).

[0061] Step 4: Use the load weighting method to calculate and determine that the average particle size ...

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Abstract

The invention discloses a method of applying limestone to a lower-layer structure of a double-layer drainage pavement and belongs to the technical field of road engineering. The method comprises the following steps: the aggregate grading, the porosity and the thickness of the lower-layer structure of the double-layer drainage pavement are designed; multiple groups of discrete element digital models of the double-layer drainage pavement structure are constructed, and a load is applied to obtain force chain distribution of the load in the lower-layer structure of the double-layer drainage pavement; the average particle size of aggregates, bearing the main load along a force chain path, in the mixture is determined and corresponds to the closest standard sieve mesh interval; the aggregates between the sieve mesh intervals are made of basalt or dolerite, and the aggregates in a size of other sieve meshes are limestone; and the performance of an asphalt mixture of two stone materials is verified. According to the method in the invention, the aggregates which bear the main load are made of basalt or dolerite, and the other aggregates are limestone, the stress characteristics of the two kinds of aggregates are fully utilized, and the cost of the lower-layer structure of the double-layer drainage pavement is effectively reduced while the performance of the asphalt mixture is ensured.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for applying limestone to the substructure of a double-layer drainage pavement. Background technique [0002] Double-layer drainage pavement has good drainage and noise reduction performance, and has been gradually promoted in rainy areas in my country. Due to the use of a large void ratio (20% to 25%), the double-layer drainage mixture mainly relies on the point contact between the aggregates to bear the load, so the requirements for the aggregate are high, and basalt or diabase is often used. . The distribution of basalt or diabase is scarce in some areas of my country, and the materials need to be transported far away, and the cost is high. [0003] For the substructure of double-layer drainage pavement, if basalt or diabase is used as aggregate, the construction cost is about 20% to 30% higher than that of conventional dense asphalt mixture. ...

Claims

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Application Information

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IPC IPC(8): E01C7/18E01C11/22
CPCE01C7/18E01C11/226
Inventor 廖公云许兵汤赞成郭乔明林子豪曾武朱宇昊朱木峰
Owner SOUTHEAST UNIV
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