EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF TIME VARYING SLURRY STONE UNDER FREEZING AND THAWING CONDITION

For the fractured rock slope and complex stratums, the grouting is a well-known crush rock treatment method in geotechnical engineering. However, the grout stone body usually face the damage of dramatic freezing-thawing cycles. In this paper, the freezing-thawing cycle test and SEM test are used to study the stone body of self-developed viscosity time-varying grout(SJP). The strength properties of SJP and blank cement stone body are study through compression test and wave test. According to the results of experiments, the mechanism of freezing and thawing damage is also discussed. The result shows that under the condition of freezing and thawing, the durability of SJP grout stone body is obviously better than blank cement stones. The compressive strength and relative dynamic elastic modulus of SJP grout stone decrease continuously with the increase of freeze-thaw cycles. But the tensile strength shows a trend of increasing firstly and then decreasing. All the decreasing rate of strengths of SJP is slower than the blank cement. When 2^# added amount to 2.0, 3^# added amount is 1.5%, SJP slurry stone body has the best frost resistance. The damage mechanism can be illustrated as follows. The production of C-S-H in SJP grout increases under the action of SJP additives, and combined with the fiber needle hydration derivatives, that make the pore structure of stone body becomes denser than the blank cement. This characteristic slows the freeze-thaw damage accumulation effectively, thus its durability under the condition of freezing and thawing is improved effectively. Therefore, the SJP stone body is more suitable for application in alpine mountain area engineering construction.