Method for improving properties of expansive soil by utilizing silica fume
A standard technology of expansive soil and geotechnical test methods, applied in the field of geotechnical engineering, can solve the problems of surrounding environment and groundwater pollution, environmental burden, greenhouse gas emissions, etc. Effect
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[0023] In this example, the expansive soil is taken from the river slope of the East Qinhuai River. According to the "Standards for Soil Engineering Test Methods" (GB / T50123-1999), the natural dry density of the expansive soil measured is 1.58g / m 3 , the free expansion rate is 55%, the optimal water content is 19.2%, the plastic limit is 23.2%, the liquid limit is 51.6, the plasticity index is 28%, the linear expansion rate is 12%, and the compressive strength without side lines is 133.2kPa. The cohesion force of the first dry-wet cycle is 3.2kPa, and the internal friction angle of the four dry-wet cycles is 4.8°, as shown in Table 1.
[0024] The method of utilizing silica fume to improve the properties of expansive soil comprises the following steps:
[0025] (1) Get 100kg of expansive soil to be improved, measure its initial moisture content to 24.5%, after natural air-drying to below 10% moisture content, crush, and pass through a 5mm sieve, measure its moisture content ag...
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