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Cement-stabilized crushed stone for highway pavement base

A technology for cement stabilizing gravel and pavement base, applied in the field of building materials, can solve problems such as unsatisfactory crack resistance, achieve sufficient strength and wear resistance, improve flexural strength, and be cheap.

Active Publication Date: 2016-04-20
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that the high-titanium heavy slag contains stable crystals and glass bodies, and its activity is lower than that of ordinary blast furnace slag, and the crack resistance when it is used in combination with cement for the pavement base is not ideal.

Method used

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  • Cement-stabilized crushed stone for highway pavement base
  • Cement-stabilized crushed stone for highway pavement base
  • Cement-stabilized crushed stone for highway pavement base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A pavement base cement-stabilized macadam with high-carbon ferrochrome slag as aggregate, which is made by stirring and mixing P.O.32.5 cement, high-carbon ferrochrome slag aggregate and water, wherein the mass percentage of cement is 4.5%, water The mass percentage is 5.5%, and the rest is high-carbon ferrochrome alloy slag aggregate. P.O.32.5 refers to ordinary Portland cement. The compressive strength of the cement test block after curing for 28 days is 32.5MPa; it has high early strength, high heat of hydration, good frost resistance, poor heat resistance, poor corrosion resistance, and dry shrinkage. smaller.

[0065] The preparation of high-carbon ferrochrome slag aggregates, using high-carbon ferrochrome slag as raw material, can produce coarse aggregate through impact crusher, impact crusher or cone crusher, and part of the coarse aggregate is further crushed into fine aggregate, high carbon The gradation range of ferrochrome alloy slag aggregate after sieving ...

Embodiment 2

[0067] A pavement base cement-stabilized macadam with high-carbon ferrochrome slag as aggregate is prepared by stirring and mixing P.O.42.5 cement, high-carbon ferrochrome slag aggregate and water, wherein the amount of cement is 5% by mass. The grading range of the high-carbon ferrochrome alloy slag aggregate after screening is the same as Table 4.

Embodiment 3

[0069] A pavement base cement-stabilized macadam with high-carbon ferrochrome slag as aggregate is prepared by stirring and mixing P.O.52.5 cement, high-carbon ferrochrome slag aggregate and water, wherein the amount of cement is 5.5% by mass. The grading range of the high-carbon ferrochrome alloy slag aggregates used after screening is the same as Table 4.

[0070] Finally, a pavement base cement-stabilized macadam prepared with high-carbon ferrochrome slag as aggregate is controlled according to Table 6 for its dry density, optimum water content, and compaction under ambient temperature conditions.

[0071] Table 6 The main control index of cement-stabilized macadam at the pavement base of the present invention

[0072]

[0073] By adjusting the amount of different materials, gradation and mix ratio, the 7-day unconfined compressive strength of the pavement base cement-stabilized gravel using high-carbon ferrochrome slag as aggregates of the present invention is actually ...

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Abstract

The invention discloses cement stabilized macadam for the base course of a highway pavement. The cement stabilized macadam which can meet different grades of requirements is prepared by producing high carbon ferrochrome slag aggregates by treating high carbon ferrochrome slag and mixing the aggregates with cement and water according to a certain proportion. The cement stabilized macadam has the beneficial effects that compared with the cement stabilized macadam conventionally adopting natural macadam as aggregates in the prior art, the cement stabilized macadam using the high carbon ferrochrome slag graded aggregates as the main raw materials in the invention can improve the bending strength and crack resistance of the base course of the pavement and prolong the service life of the highway pavement; the industrial waste high carbon ferrochrome slag is utilized to replace the natural aggregates and is applied to the cement stabilized macadam base course of the pavement, thus providing an approach to solve the problem of discharge of the high carbon ferrochrome slag, reducing the mining quantity of natural stones in highway construction and being beneficial for environmental protection and sustainable development; and the cement stabilized macadam reduces the highway project investment and has good economic benefits.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a cement-stabilized crushed stone for a highway pavement base. Background technique [0002] Highway pavement structure generally consists of surface course, base course and cushion course. Compared with other base structures, cement-stabilized macadam has the advantages of high strength, strong integrity, and good durability. It is one of the most commonly used base materials for high-grade pavements. Cement-stabilized crushed stone uses graded crushed stone as aggregate, uses a certain amount of cementitious material and sufficient mortar volume to fill the gaps in the aggregate, and paves and compacts the material according to the principle of embedded extrusion; its compaction degree is close to The compactness and strength mainly rely on the principle of interlocking and locking between crushed stones, and at the same time, there is enough mortar volume to fill the gaps i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/14
CPCY02W30/91
Inventor 陈志峰谢春生李松张丙文王传波
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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