EFFECT OF BASALT FIBER ON PROPERTIES OF CEMENT SOLIDIFIED SOFT SOIL

Cement solidified soft soil is a common foundation treatment method in engineering. However,many engineering practices have shown that the early strength of soft soil reinforced by cement alone is low,and the volume of cement solidified soil shrinks with the growth of the curing age. They are likely to cause settlement and cracking of the engineering soil mass. We used basalt fibers to solidify soft soils with cement to explore the effect of basalt fibers on the strength and shrinkage performance. We prepared the different cement and basalt fibers solidified soil samples in this experiment. Under various age conditions,we tested the unconfined compressive strength and volume shrinkage property of the specimens to determine the optimum cement and fibers dosage. From the microstructural characteristics of the specimens,we analyzed the fibers mechanism on the strength and shrinkage distortion of cement solidified soil. The results show that the addition of fibers can effectively improve the strength and shrinkage of the cement soil. The fibers are randomly distributed in the specimen. The presence of fibers can play a "bridge" role,filling the pores of the soil sample together with the hydration products of cement,making the soil particles fully connected,limiting the displacement between the particles,improving the strength of the specimen,inhibiting the shrinkage of the specimens,and improving the overall stability of the soil mass. The research results can provide theoretical and practical references for the effective solidified treatment and efficient utilization of soft soils.