Study on Strength and Micro-mechanism of Carbide Slag-Ground Granulated Blast Furnace Slag-based Pisha Sandstone Composite Soil
GUO Changxu1, LI Xiaoli1,*, XIE Weidong2, LI Dahu1, WANG Jingfeng1, ZHAO Xiaoze1
1 College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China 2 Inner Mongolia Autonomous Region Water Resources Development Center, Hohhot 010018, China
Abstract: Aiming at the problems of the loose structure and poor cementation of Pisha Sandstone in the Ordos plateau, modified Pisha Sandstone composite soil was prepared using carbide slag (CS) and ground granulated blast furnace slag (GGBS) as cementitious materials to realize large-scale application in engineering. The strength and micro-mechanism of CS-GGBS-based Pisha Sandstone composite soil was investigated through tests such as unconfined compression strength, pore fluid alkalinity, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and mercury intrusion pores. The results show that 5%—15% CS can induce the Pisha Sandstone to participate in the volcanic ash reaction and further promote the hydration of GGBS, generating more C-A-S-H gel and increasing strength. However, with the increase of the amount of CS, a large amount of alkali feldspar-phase, calcium hydroxide, and calcite existed in the system, and the gel structure deteriorated, making the internal structure of the composite soil loose, thus affecting the development of strength. There is an optimal ratio of CS-GGBS-based Pisha sandstone composite soil when the doping ratio of CS is 15%. In this instance, its porosity is 27.84%, the percentage of small pores is 12.57%, its structure is dense, its mechanical strength is the largest of 5.4 MPa at 7 d, which meets the strength requirements of the structural layer of the highway, first-class highway and so on. The research can provide the theoretical basis for the application of CS-GGBS-based Pisha sandstone composite soil in practical engineering.
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2025, Vol. 39 
