1 Department of Civil Engineering, Logistic Engineering University, Chongqing 401311; 2 Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Chongqing 401311; 3 Department of Chemistry and Material Engineering, Logistic Engineering University, Chongqing 401311; 4 School of Civil Engineering,Lanzhou University of Technology, Lanzhou 730050
Abstract: In this paper, the reinforcing of loess by electricity-modified sodium silicate was studied through the orthogonal test and single factor control experiment. From the aspects of chemical composition, mineral composition and microstructure perspectives, the paper further analyzed and discussed the mechanism of loess reinforced by electricity-modified sodium silicate. The experimental results indicated that the unconfined compressive strength of the reinforced loess was proportional to the voltage and electrifying time; as the content of Na2O and modulus kept increasing, the strength of the reinforced loess firstly decreased, then reached the lowest extreme point before it increased; amorphous phase peak groups appeared in the X-ray diffraction pattern, and as the Na2O content kept increasing, the amorphous phase and the diffraction intensity experienced a fall before a rise; the SEM images suggested that the voltage of sodium silicate can accelerate the generation of silica, which would tighten the particle skeleton and improved the soil strength by covering the soil particles and filling the gaps between particles; the accelerated surface area-porosimetry system (BET) showed that with the increase of the voltage and the electrifying time, the small pores, pore volume and pore surface area were augmented while the scale of pore size was narrowed, and the average pore size remained hardly changed.
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2017, Vol. 31 
