Proportion and Performance of Grouting Materials Prepared by Red Clay Slag in Karst Area

Abstract

Abstract: During the construction of bored piles in karst area, grouting method can effectively improve the problems such as easy loss of concrete, broken pile, holes in pile body and so on, but the cost of traditional grouting materials is high and the performance is excessive; on the other hand, there are often a lot of abandoned slag in the construction site that need to be properly disposed of. A new type of grouting material was prepared by using red clay slag as base material, cement and fly ash as main curing agents and sodium silicate as auxiliary. Through the orthogonal test, the influence of each component on the key performance index of slurry was explored, the optimum proportion was determined, and the microstructure of slurry stone body under the optimal proportion was analyzed. The results show that the water-soil ratio is the main factor affecting the performance of slurry. The content of cement has the greatest influence on the strength of slurry stone body. The fly ash increases the concretion rate of slurry and improves the later strength of stone body. The sodium silicate mainly plays a role in accelerating setting. The optimal proportion of slurry is water-soil mass ratio of 0.6, cement content of 10% (mass fraction), fly ash content of 12% (mass fraction) and sodium silicate content of 1.1% (mass fraction). After comprehensive analysis, the slurry has the characteristics of high fluidity, good fallibility, moderate strength and low cost, which meets the large-scale use of the engineering.

Key words: red clay slag, grouting material, proportion of slurry, fluidity, bleeding rate, concretion rate

CLC Number:

TU521

ZHANG Yi, DENG Bianyuan, ZHANG Yanjie, GUI Yue. Proportion and Performance of Grouting Materials Prepared by Red Clay Slag in Karst Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3712-3722.

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