A high-strength and low-shrinkage anti-crack pavement base material

A pavement base material and low-shrinkage technology, applied in the field of building materials, can solve the problems of shortage of road construction resources, large shrinkage cracks, small shrinkage coefficient, etc., achieve high bonding strength, overcome dry shrinkage, and reduce water absorption.

Active Publication Date: 2018-05-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a high-strength, low-shrinkage anti-crack pavement base material, which uses steel slag sand and fine-grained soil as raw materials to replace gravel, and uses a certain amount of cement and admixtures to stabilize the steel slag soil. It solves the problem of shortage of road construction resources and large shrinkage and cracking when cement-stabilized fine-grained soil is used as the base, and can effectively reduce the cost of the road base. The obtained base material has the characteristics of high strength, small drying shrinkage coefficient, and good water stability. , meet the technical requirements, can improve the crack resistance of the base material, prevent cracks, improve the road performance and durability of the base material, ensure the stability of the structure, and be widely used in engineering practice. At the same time, it can effectively utilize widely distributed soil resources and industrial It is a by-product that replaces natural resources such as gravel, and involves simple preparation methods, low raw material costs, and is suitable for popularization and application

Method used

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  • A high-strength and low-shrinkage anti-crack pavement base material

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Effect test

Embodiment 1

[0040] A high-strength, low-shrinkage anti-crack pavement base material, which is compounded by cement, steel slag sand, fine-grained soil and admixtures in a mass ratio of 6:20:72:2, wherein the components in the admixtures and their The mass percentage is: 5% of dihydrate gypsum, 2% of sodium metasilicate nonahydrate, 1% of water stability enhancer, 20% of mineral powder, 25% of calcium chloride, 25% of magnesium oxide, and 22% of slaked lime; The preparation method of high-strength and low-shrinkage anti-crack pavement base material is as follows:

[0041] According to the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTG E51-2009), the optimum water content of the above raw materials is 14.78%, and the maximum dry density is 2.068g / cm 3 ; Take steel slag sand and fine-grained soil according to the weight ratio of each component, mix the two, and add 3% less water than the optimum water content, and keep the stuffing for no less than 10 hours...

Embodiment 2

[0048] A high-strength, low-shrinkage anti-crack pavement base material, which is compounded by cement, steel slag sand, fine-grained soil and admixture at a mass ratio of 6:40:51:3, wherein the components in the admixture and their The mass percentage is: 5% of dihydrate gypsum, 5% of sodium metasilicate nonahydrate, 2% of water stability enhancer, 15% of mineral powder, 28% of calcium chloride, 20% of magnesium oxide, and 25% of slaked lime.

[0049] According to the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTG E51-2009), the optimum water content of the above raw materials is 15.48%, and the maximum dry density is 2.074g / cm 3 ; Take steel slag sand and fine-grained soil according to the weight ratio of each component, mix the two, and add 3% less water than the optimum water content, and keep the stuffing for no less than 10 hours; Water gypsum, sodium metasilicate nonahydrate, calcium chloride, magnesium oxide, mineral powder, slaked li...

Embodiment 3

[0054] A high-strength, low-shrinkage anti-crack pavement base material, which is compounded by cement, steel slag sand, fine-grained soil and admixture at a mass ratio of 6:10:80:4, wherein the components in the admixture and their The mass percentage is: 5% of dihydrate gypsum, 4% of sodium metasilicate nonahydrate, 2% of water stability enhancer, 20% of mineral powder, 15% of calcium chloride, 29% of magnesium oxide, and 25% of slaked lime.

[0055] According to the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTG E51-2009), the optimum water content of the above raw materials is 15.08%, and the maximum dry density is 2.070g / cm 3 ; Take steel slag sand and fine-grained soil according to the weight ratio of each component, mix the two, and add 3% less water than the optimum water content, and keep the stuffing for no less than 10 hours; Water gypsum, sodium metasilicate nonahydrate, calcium chloride, magnesium oxide, mineral powder, slaked li...

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Abstract

The invention discloses a high-strength low-shrinkage crack-resistant pavement base material and belongs to the field of building materials. The high-strength low-shrinkage crack-resistant pavement base material is prepared through compounding cement, steel slag sand, fine-grained soil and an admixture which are in the mass ratio of 6: (10 to 40): (49 to 83): (1 to 5). According to the base material disclosed by the invention, the steel slag sand and the fine-grained soil serve as raw materials and replace gravels, and a certain volume of the cement and a certain amount of the admixture are adopted to carry out stabilizing treatment on the steel slag sand and the fine-grained soil, so that the problems that road-building resources are short and the shrinkage cracking is high when cement stabilized fine-grained soil serves as a base layer are solved, and the construction cost of a base of a road can be effectively reduced. The base material has the characteristics of high strength, small coefficient of shrinkage, good water stability and the like and meets technical requirements; and the crack resistance of the base material can be improved, cracking is prevented, the road performance and durability of the base material are improved, and the effect of guaranteeing structural stability is achieved, so that the base material can be extensively applied to engineering practice.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a high-strength and low-shrinkage anti-crack pavement base material. Background technique [0002] In the pavement structure of my country's highways, stone is mostly used as the base material of the pavement. Due to the huge demand for sand and gravel, it can no longer meet the growing demand for engineering construction. It has to adopt methods such as digging mountains to blast rocks, digging rivers and mining sand to obtain raw materials, which has caused serious damage to the natural environment. On the other hand, the distance between the quarry and the construction site is relatively long, and the long-distance stone transportation increases the project cost. Therefore, in order to save the use of stone materials and reduce transportation costs, researchers at home and abroad make full use of the most extensive sources of soil resources, and use stable materials to treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/14C04B24/08C04B22/06C04B14/10C04B5/00C04B5/02C04B22/14C04B22/08C04B22/12
CPCC04B5/00C04B20/0076C04B28/04C04B2111/0075C04B2111/343C04B2201/50C04B18/142C04B22/143C04B22/08C04B22/124C04B22/066C04B18/14C04B22/064C04B24/085C04B14/10Y02W30/91
Inventor 胡曙光帕丽达·卡地尔丁庆军李彦训谯理格徐意石华刘勇强
Owner WUHAN UNIV OF TECH
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