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《Journal of Glaciology and Geocryology》 2018-02
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Study on the performance of gravel road stabilized by early strength agent and brucite fibers in alpine regions

SHENG Yanping;LI Liangliang;GUAN Bowen;ZHOU Huili;HE Rui;CHEN Huaxin;School of Materials Science and Engineering,Chang'an University;Qinghai Research Institute of Transportation;  
Aiming to improve the adaptability of cement stabilized macadam base in the alpine regions,both early strength agent and brucite fiber were added to the basement layer. The performances,such as compressive strength,splitting tensile strength,shrinkage and frost resisting property of the base were studied. Also,the effect of adding brucite mineral fiber to cement-stabilized macadam was analyzed. Test results showed that after adding early strength agent and brucite fiber both,compressive strength and the splitting tensile strength of the base reached 85% after 3 days and reached 76% after 28 days,respectively,under curing at 20 ℃. Meanwhile,compressive strength and splitting tensile strength of the base in 3 days reached 69% and 68% in 28 days,respectively,under curing at-15 ℃. The anti-shrinkage properties of the base was improved by adding brucite fiber at the optimum mix amount of 4%,as a result,the dry shrinkage coefficient and shrinkage coefficient of the base were reduced by about 92% and 48%,respectively,compared to that without brucite fiber. Meanwhile,frost resistance of the base was improved as well,for example,when the optimum mix amount was also 4%,the BDR of the base would be 0. 96%. Through the experiments,the following conclusion can be drawn: the addition of both early strength agent and brucite fiber in the base can not only improve the strength of the base but also prevent shrinkage and lowtemperature cracking. The optimum mix amount is 4% in the base.
【Fund】: 国家重点研发计划项目(2017YFB0309903-02);; 青海省科技计划项目(2017-ZJ-763;2017-ZJ-764;2017-ZJ-715);; 中央高校基本科研业务费专项资金项目(310821171115;300102218502)资助
【CateGory Index】: U414
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