Global Geology 2010, 13(2) 79-84 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
collapsible loess
cement
unconfined compression strength
Authors
PubMed

Experimental study on improving collapsible loess with cement

SHAN Bo1, WANG Changming1, DONG Quanyang1, TANG Ling1, ZHANG Guangyi2 and WEI Jiaming1

1. College of Construction Engineering, Jilin University, Changchun 130026, China; 2. Bridge Engineering Co. , Ltd. of China Railway No. 1 Engineering Group, Chongqing 401121, China

Abstract

The collap sibility of loess ground can directly affect stability of subgrade. Therefore, how to adopt practical technical measures to reduce or eliminate its collapse deformation is an important content in foundation design in collapsible loess zone. Selecting collapsible loess from Fuxin-Chaoyang highway in Liaoning, the authors conducted a series of tests for improving loess with cement. The loess in different water content was mixed with the cement in varying proportions, unconfined compression strength for the samples at four different curing periods were tested, and the relationships of improved soil strength among cement mixture ratio and curing periods were analyzed. When the curing periods are certain, the strength of loess increases along with the mixture ratio increases; when the cement mixture ratio is 5% -15% , the scope of increases is quite obvious; when the mixture ratio is greater than 15% , the tendency of intensity increases turns slow. When the mixture ratio for the specimen is certain, the intensity of the test specimen increases along with the curing period increases, the intensity grows obviously in 28 days, and the growth rate is small in 28-90 days, the intensity tends to be steady in the curing period of 90 days.

Keywords collapsible loess   cement   unconfined compression strength  
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