A study on high-performance grouting mortar is reported. The common mortar was modified by mineral admixtures such as gypsum, bauxite, and alunite. The effects of mineral admixtures on the fluidity, setting time, expansion, strength, and other properties of mortar were evaluated experimentally. The microstructure of the modified mortar was characterized by X-ray diffraction, scanning electron microscopy, and mercury intrusion porosimetry. Moreover, the expansive performance and strength of the grouting mortar were verified by anchor pullout test. The results show that the best conditions for gypsum-bauxite grouting mortar are as follows: a water-to-binder ratio of 0.3, a mineral admixture content of ~15%, and a molar ratioKof 2. The ultimate bearing capacity of the gypsum-bauxite grouting mortar anchor increased by 39.6% compared to the common mortar anchor. The gypsum-bauxite grouting mortar has good fluidity, quick-setting, microexpansion, early strength, and high strength performances.
This paper discusses the development of a grouting material with a short setting time, early strength, high strength and appreciable volume expansion. The main properties of the grouting material were studied with respect to different ratios of added alunite and gypsum. The results showed that when the appropriate amounts of alunite and gypsum were added to the mortar the setting time was controlled between 0·5 h and 1·5 h, compressive strength on the first day and the third day reached 20 MPa and 40 MPa, respectively and the pull-out force of a 1 m long sample on day 14 was 90 kN. Microanalysis of the material using mercury intrusion porosimetry, scanning electron microscopy and x-ray diffraction revealed the presence of numerous expansive crystals structures that existed steadily for a long period.
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