Research of Strength and Freezing-thawing Durability of Saline Soil Solidified by Modified Sodium Silicate

In order to solve relevant engineering problems about sulphate salty soil and the collapsibility of saline, research of saline soil solidified by coal ash which was stimulated by temperature modification sodium silicate, was conducted in this paper. Strength and freezing-thawing durability of saline soil solidified by sodium silicate modified by temperature were studied by means of freeze-thaw cycle test, unconfined compressive strength test, X-ray diffraction spectra and microstructure test. The result shows that the strength of saline soil solidified by modified sodium silicate decreases against the rise of temperature. The shear strength of saline soil solidified by sodium silicate which is modified under different temperature decreases while the times of freeze-thaw cycle tests increase and its decreasing range is lessen after 10 times. There is no appearance of new crystal materials in saline soil solidified by sodium silicate modified by temperature. With the increasing of modification temperature, the diffracted intensity of mirabilite and dolomite gets enhanced, the apparent porosity becomes bigger, and strength decreases. The microstructure is damaged after freeze-thaw cycle tests.