Steel slag asphalt graded crushed rock mixture

A technology for grading crushed stone and steel slag asphalt, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of lack of asphalt grading crushed stone mixture, etc. And the effect of low maintenance cost and improved carrying capacity

Inactive Publication Date: 2012-07-18
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current comprehensive utilization of steel slag in the field of road engineering is mainly focused on the application of asphalt pavement, and there is no precedent for using steel slag to prepare asphalt graded gravel mixture for flexible road base structures

Method used

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  • Steel slag asphalt graded crushed rock mixture

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A steel slag asphalt graded crushed stone mixture, the weight percentage content of each component is: aggregate particles account for 92%, 70# heavy traffic asphalt accounts for 5%, limestone powder accounts for 3%, and the aggregate is 31.5mm≥ Steel slags with particle size > 19mm, 19≥ particle size > 9.5mm, 9.5≥ particle size > 4.75mm, 4.75≥ particle size > 0mm are composed of steel slag with four particle sizes, and the weight percentages of the four particle sizes in the aggregate are 21%, 22%, 21% and 36%, the steel slag is obtained from the converter slag of Wuhan Iron and Steel Company after three years of aging under natural conditions, and the apparent relative density of the selected steel slag is between 3.300 and 3.400g / cm 3 The content of free calcium oxide in steel slag is below 1.5%, the volume expansion rate of steel slag soaked in hot water at 60°C for 120 hours is not more than 2%; the apparent relative density of the selected limestone is 2.600-2.800g...

Embodiment 2

[0019] A steel slag asphalt graded crushed stone mixture, the weight percent content of each component is: aggregate particles account for 90%, asphalt accounts for 6%, limestone powder accounts for 4%, the aggregate is 31.5mm ≥ particle size > 19mm, 19 ≥ particle size > 9.5mm, 9.5 ≥ particle size > 4.75mm steel slag particles and 4.75 ≥ particle size > 0mm limestone particles, the weight percentages of the four particle gradations in the aggregate are 22% and 24% in turn , 22% and 32%, of which the steel slag is obtained from the converter slag of Wuhan Iron and Steel Company after three years of aging under natural conditions, and the apparent relative density of the selected steel slag is between 3.300 and 3.400g / cm 3 The content of free calcium oxide in steel slag is below 1.3%, the volume expansion rate of steel slag soaked in hot water at 60°C for 120 hours is not more than 2%; the apparent relative density of the selected limestone is 2.600-2.700g / cm 3 Among them, the p...

Embodiment 3

[0021] A steel slag asphalt graded crushed stone mixture, the weight percentage content of each component is: aggregate particles account for 93%, asphalt accounts for 4%, limestone powder accounts for 3%, the aggregate is 31.5mm≥grain size>19mm, 19≥grain size>9.5mm two kinds of steel slag particles and 9.5≥grain size>4.75mm, 4.75≥grain size>0mm two grades of limestone particles, the weight percentage of the four kinds of particle size in the aggregate is 24 %, 20%, 20% and 36%, the apparent relative density of the selected steel slag is 3.300~3.400g / cm 3 The content of free calcium oxide in steel slag is below 1.2%, the volume expansion rate of steel slag soaked in hot water at 60°C for 120 hours is not more than 2%; the apparent relative density of the selected limestone is 2.700-2.800g / cm 3 Among them, the particle size distribution of limestone ore powder used is: 0.6mm pass rate is 100%, 0.15mm pass rate is 95-100%, and 0.075mm pass rate is 90-100%.

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Abstract

The invention discloses steel slag asphalt graded crushed rock mixture. The steel slag asphalt graded crushed rock mixture comprises the following components in percentage by weight: 90-93 percent of aggregate particle, 4-6 percent of asphalt and 3-4 percent of limestone mineral powder, wherein the aggregate comprises the following four grain compositions in percentage by weight: 21-24 percent of grain composition 1, 20-28 percent of grain composition 2, 19-25 percent of grain composition 3 and 32-37 percent of grain composition 4; the granularity of the grain composition 1 is smaller than or equal to 31.5mm and larger than 19mm, the granularity of the grain composition 2 is smaller than or equal to 19mm and larger than 9.5mm, the granularity of the grain composition 3 is smaller than or equal to 9.5mm and larger than 4.75mm, and the granularity of the grain composition 4 is smaller than or equal to 4.75mm and larger than 0mm; and the aggregate is steel slag or the mixture of the steel slag and limestone. Proved by experiments, the mixture has the advantages of low cost, reasonable granularity grain size distribution, water proof performance and good stability.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and specifically refers to a steel slag asphalt graded gravel mixture used for road flexible bases. Background technique [0002] More than 90% of the highways built in our country use semi-rigid materials as the base layer and asphalt concrete as the surface layer, that is, semi-rigid pavement. This pavement structure has the advantages of high strength and bearing capacity, but its disadvantages are also obvious, which are mainly reflected in: 1) The shrinkage of the semi-rigid base material is relatively large, which can easily cause reflective cracks on the asphalt pavement, resulting in local network cracks and pits 2) The drainage performance of the semi-rigid base is poor, and it is easy to cause water to stay between the base and the surface layer, thereby affecting the force on the road surface and resulting in a decrease in the overall bearing capacity of the base; 3) Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B18/14
CPCY02W30/91
Inventor 李灿华吴少鹏汪平刚庞凌汪晖谢君李晖吴江红刘思苏悦唐岚
Owner 武钢集团有限公司
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