Preparation of Cement-Slag Based Early Strength Curing Agent and Macro and Micro Properties of Solidified Soil

Abstract

Abstract: In order to improve the utilization of industrial waste residue, phosphogypsum, blast furnace slag and sodium silicate were conducted to replace part of cement stabilize silt. The regression equation of unconfined compressive strength cured for 3 and 7 d was obtained through the D-optimal mixture design, and the optimal mass ratio was calculated. The unconfined compressive strength for 3 and 7 d were separately 4.88 and 5.84 MPa by using the optimal formula to solidified soil samples. The microscopic mechanism of solidified soil was studied by X-ray diffraction and scanning electron microscopy. The results show that the hydration reaction of the optimal solidified soil is more complete than that of the cement solidified soil, the connection between the particles is more dense, and the structure is more stable. Finally, the environmental and economic evaluation of the optimal formula was carried out, and it is concluded that the formula is superior to cement in strength, environment and economy.

Key words: industrial waste residue, early strength curing agent, D-optimal mixture design, optimal mixture ratio, unconfined compression strength, microscopic mechanism

CLC Number:

TU502

LI Shuaikang, YU Feng, CHEN Xin, YU Jing. Preparation of Cement-Slag Based Early Strength Curing Agent and Macro and Micro Properties of Solidified Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3964-3977.

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