Mix Proportion and Performance of Delayed Setting Bag Grouting Filler

Abstract

Abstract: In order to develop a new type of bag grouting filler, cement-bentonite was used as main filling material. On the basis of studying the influence of single doped triethanolamine (TEA), codoped TEA and 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) on the performance of the filler, through orthogonal test, the effects of five factors, namely water cement ratio, bentonite content, HEDP content and polycarboxylate superplasticizer (PCE) content and TEA content on the performance of the filling material were studied, and the best mix ratio of the filler was determined. Finally, the microstructures were analyzed by XRD, LF-NMR and SEM testing methods. The results show that TEA can optimize the pore structure of the filler and improve its early strength, bentonite can significantly reduce the bleeding rate of the filler, HEDP can significantly delay the initial setting time of the filler, and PCE can enhance the fluidity of the filler. The optimal proportion of filler is water cement ratio 0.9, bentonite 8%(accounts for cement mass fraction, the same below), HEDP 0.15%, PCE 1.0%, TEA 0.02%. The initial setting time of the optimized filler is 138.42 h, and the 7 d compressive strength is 5.7 MPa.

Key words: bag grouting filler, orthogonal test, mix proportion optimization, admixture, delayed setting, micro-characteristic

CLC Number:

TU525

DENG Junrong, SU Dong. Mix Proportion and Performance of Delayed Setting Bag Grouting Filler[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4309-4322.

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