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A Construction Method for Reducing Cracks in Base of On-site Cement Cold Recycled Mixture

A technology of cold recycled mixture and construction method, which can be applied to cohesive pavement, roads, buildings and other directions paved on site. It can solve problems such as the subsidence of the pavement base and surface layer, affecting the driving quality and service life of the pavement, and avoid swelling. Uneven shrinkage, easy for operators to grasp, and reduce the effect of excessive expansion agent

Active Publication Date: 2018-10-02
DAYUAN CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, if the cracks in the base layer are not treated properly, the rainwater on the road surface will seep into the roadbed through the central divider or the pores of the road surface layer, which will cause the roadbed to accumulate water in the cracks, resulting in the subsidence of the base layer and the surface layer of the road surface, which will affect the roadbed to a large extent. Improve the driving quality and service life of the road surface

Method used

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  • A Construction Method for Reducing Cracks in Base of On-site Cement Cold Recycled Mixture
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  • A Construction Method for Reducing Cracks in Base of On-site Cement Cold Recycled Mixture

Examples

Experimental program
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Effect test

example 1

[0033] Such as figure 1 As shown, a construction method for reducing the cracks in the cement cold recycled mixture base course includes the following steps:

[0034] Step 1: Prepare the expansion agent used in the base construction of the on-site cement cold recycled mixture. The percentages of the components of the expansion agent added to the weight of the cement are: calcium sulfoaluminate 6%, fly ash 1%, silica fume 1% %, 0.5% iron powder, 0.1% aluminum oxide, 1% polypropylene fiber and 0.01% organic retarder.

[0035] Step 2: Mix the expansion agent described in step 1 with the on-site cement cold recycled mixture according to a certain ratio; wherein the cement is cement with low heat of hydration, such as: slag cement or fly ash cement, and its content accounts for The percentage by weight of the whole mixture is 0.5%, and the mixing time is 30s;

[0036] Step 3: Equip the cold recycling machine with special calcium sulfoaluminate expansion agent, fly ash and silica ...

example 2

[0052] A construction method for reducing cracks in the base course of cement cold recycled mixture on site, specifically comprising the following steps:

[0053] Step 1: Prepare the expansion agent used in the base construction of the on-site cement cold recycled mixture. The percentages of the addition of each component of the expansion agent to the weight of the cement are: calcium sulfoaluminate 8%, fly ash 1.5%, silica fume 1.5% %, iron powder 1.5%, aluminum oxide 1%, polypropylene fiber 1.5% and organic retarder 0.1%.

[0054] Step 2: Mix the expansion agent described in step 1 with the on-site cement cold recycled mixture according to a certain ratio; wherein the cement is cement with low heat of hydration, such as: slag cement or fly ash cement, and its content accounts for The percentage of total compound weight is 0.8%, and the mixing time is 30s;

[0055] Step 3: Equip the cold recycling machine with special calcium sulfoaluminate expansion agent, fly ash and silic...

example 3

[0072] A construction method for reducing cracks in the base course of cement cold recycled mixture on site, specifically comprising the following steps:

[0073] Step 1: Prepare the expansion agent used in the base construction of the on-site cement cold recycled mixture. The percentages of the addition of each component of the expansion agent to the weight of the cement are: calcium sulfoaluminate 7%, fly ash 1.2%, silica fume 1.2% %, 1% iron powder, 0.5% aluminum oxide, 1.2% polypropylene fiber and 0.05% organic retarder.

[0074] Step 2: Mix the expansion agent described in step 1 with the on-site cement cold recycled mixture according to a certain ratio; wherein the cement is cement with low heat of hydration, such as: slag cement or fly ash cement, and its content accounts for The percentage of total compound weight is 0.6%, and the mixing time is 30s;

[0075] Step 3: Equip the cold recycling machine with special calcium sulfoaluminate expansion agent, fly ash and sili...

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Abstract

The invention provides a construction method for reducing on-site cement cold regenerated mixture base cracks. The construction method comprises the following steps: I, preparing an expanding agent adopted for base construction of an on-site cement cold regenerated mixture, wherein the expanding agent comprises calcium sulfoaluminate, pulverized fuel ash and silica fume; II, blending the expanding agent in the step I with the on-site cement cold regenerated mixture in a certain proportion; and III, performing the base construction of the on-site cement cold regenerated mixture, and maintaining the road added with the expanding agent after the construction is completed. The overhigh expansion rate caused by excessive expanding agent is decreased, and further the problem that the expansion damaging phenomenon and the crack problem in the on-site cement cold regenerated mixture base layer due to dry contraction and temperature contraction can be avoided, and the performance of cement is improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of road maintenance. More specifically, the invention relates to a construction method for reducing cracks in the base course of cement cold recycled mixture on site. Background technique [0002] On-site cement cold recycling technology is a very important recycling technology. It can make full use of the old pavement materials, mill and crush the asphalt pavement, and add a certain proportion of new aggregate to fully mix and pave on-site Roll forming has the advantages of high efficiency, low cost, and environmental protection. Cement cold recycled mixture has high compressive strength and good water resistance, but the dry shrinkage and temperature shrinkage are not easy to control, which is a technical problem in cement cold recycling technology. Dry shrinkage and temperature shrinkage are prone to cracks, that is, the fine cracking phenomenon on the surface of the base layer after the cement stabiliz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/14C04B28/00C04B22/14
CPCC04B22/142C04B28/00E01C7/142C04B18/08C04B18/14
Inventor 陈峰刘焕广郭京伟郭广芳赵广田李建华
Owner DAYUAN CONSTR GRP