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Research on Cement Cold-recycled Base

Author: LiuTao
Tutor: DongRuiZuo
School: Chongqing University
Course: Traffic and Transportation Engineering
Keywords: The cement cold renewable grassroots Gyratory Strength Failure pattern Dry Shrinkage Properties
CLC: U416.2
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 0
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Abstract


Cement cold recycling technology has important practical significance for the full use of the original pavement materials, reduce the exploitation of resources, and reduce the cost of maintenance and upkeep. However, after many years of engineering practice, in accordance with the specifications for the design of the cement cold recycled mixes low compressive strength, pavement long-term pavement performance is not ideal. Therefore, it is necessary to depth research on the cement cold renewable technology to solve problems. This article first introduces the the cement cold renewable technology research status at home and abroad, including the theoretical research and engineering examples. And then summed up the impact of the cement cold renewable Mixes performance influencing factors, currently our existing research in the cement cold renewable technology issues and reasons discussed in detail. Cement cold recycling technology research at home and abroad on the basis of, material level of the cement cold renewable grassroots with the analysis, the systematic study of the strength test, shrinkage test and failure mode of content, application for the cement cold renewable technology in our grade highway provide a theoretical basis. Secondly, the use of heavy compaction and gyratory test to study the performance of the old material compaction and moisture content of the the old material strength and drying shrinkage performance impact. The research results show that the Institute compaction properties of the old material and new material vary greatly, not the moisture content of the maximum dry density at the optimum moisture content, be finalized the old balance of strength and drying shrinkage performance optimum moisture content of the material. In this paper, the tests showed that the with rotating compaction test method to determine the proportion of the optimum moisture content of the old material compaction test method is more appropriate. Compressive strength performance and failure pattern of the old material, draw the old material to meet traffic loads required to achieve optimum cement content. Once again, the problem of inadequate performance of the old material shrinkage, research expanders, superplasticizer and fly three additives of old material drying shrinkage performance improvement. The study showed that the fly ash and expansion in certain dosage can reduce shrinkage strain of old material to improve the performance of old material shrinkage. Superplasticizer reduces the maximum shrinkage strain of the old stuff, but it increases the the early shrinkage strain of the old material, and increased risk of early cracking of the old material, so superplasticizer in renewable use of the grass-roots level should be carefully and must ensure adequate early conservation. Finally, a summary of the research and the use of the above empirical conclusions technology further research direction of the cement cold renewable grassroots.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering
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