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Mix proportion optimization method of low-freezing point asphalt mixture

A technology of asphalt mixture and optimization method, which is applied in the direction of material analysis, specific gravity measurement, material inspection products, etc., can solve the problems of insufficient durability, deicing effect and durability, etc., achieve significant social benefits, promote development, and save manpower and material resources Effect

Inactive Publication Date: 2018-12-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of insufficient durability of the existing low-freezing-point asphalt mixture and the contradiction between deicing effect and durability, and provides a method for optimizing the proportion of low-freezing-point asphalt mixture

Method used

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  • Mix proportion optimization method of low-freezing point asphalt mixture
  • Mix proportion optimization method of low-freezing point asphalt mixture
  • Mix proportion optimization method of low-freezing point asphalt mixture

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specific Embodiment approach 1

[0039] Specific embodiment 1: The method for optimizing the mixing ratio of the low freezing point asphalt mixture in this embodiment is implemented in the following steps:

[0040] 1. Preparation of raw materials for low freezing point asphalt mixture and cementitious materials:

[0041] Weigh asphalt, coarse aggregate, fine aggregate, low-freezing point filler and mineral powder as the raw materials of low-freezing point asphalt mixture;

[0042] 2. Determination of the best asphalt dosage:

[0043] a. Preparation of Marshall test piece: preset (appropriate) mixture asphalt dosage, with the preset mixture asphalt dosage as the median value, and change the median asphalt dosage at 0.3% to 0.5% intervals, select at least 4 Different amounts of asphalt mixture, mix different amounts of asphalt with coarse aggregates, fine aggregates, low-freezing point fillers and mineral powders, and compact to obtain Marshall specimens. Each Marshall specimen has the same mineral gradation. ;

[0044...

specific Embodiment approach 2

[0064] Specific embodiment two: this embodiment is different from specific embodiment one in that the raw materials of the low freezing point asphalt mixture in step one all meet the requirements of "Technical Specification for Construction of Highway Asphalt Pavements" (JTG F40-2004).

specific Embodiment approach 3

[0065] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the coarse aggregate in step one is crushed stone, and the fine aggregate is machine-made sand.

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Abstract

The invention discloses a mix proportion optimization method of a low-freezing point asphalt mixture, and belongs to the technical field of the road engineering material. The problem that the existinglow-freezing point asphalt mixture is insufficient in durability and conflict in deicing effect and the durability is solved. The optimization method comprises the following steps: one, preparing rawmaterials; two, determining the optimal asphalt content: a, preparing a Marshall sample; b, measuring a physical index of the low-freezing point asphalt mixture; c, measuring a mechanics index of thelow-freezing point asphalt mixture; d, measuring a complex shear modulus coefficient deltaG* of an asphalt cement; and e, drawing a relational graph of the asphalt content and various indexes to determine the optimal asphalt content; and three, synthesizing the low-freezing point asphalt mixture by using the determined optimal asphalt content, and performing verification assessment through a pavement performance test. Besides the conventional asphalt mixture physical mechanic indexes, the invention further provides a new index so as to control the durability of the mixture, and the problem that the existing low-freezing point asphalt mixture is insufficient in durability and conflict in deicing effect and the durability is solved.

Description

Technical field [0001] The invention belongs to the technical field of road engineering materials, and specifically relates to a method for optimizing the mixing ratio of a low-freezing point asphalt mixture. Background technique [0002] Low freezing point asphalt mixture is a new type of pavement functional material, which has the function of actively removing ice and snow. The low-freezing point asphalt mixture is processed by different processing techniques to the freezing point depressant, and formed into particles or powders of different sizes, which is a low-freezing point filler; partly or completely replaced by the low-freezing point filler with mineral powder After being coated with asphalt, it is combined with asphalt to form an asphalt binder, and combined with coarse and fine aggregates in a certain proportion to form an asphalt mixture. After being mixed into a type, the low freezing point filler with the effect of reducing freezing point is uniformly dispersed in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/00G01N15/08G01N33/42G01N3/24G01N3/00
CPCG01N9/00G01N3/00G01N3/24G01N15/088G01N33/42
Inventor 徐慧宁谭忆秋刘凯迪郑斌孙嵘蓉杨雄田东
Owner HARBIN INST OF TECH
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