Development of Rapid-hardening, Expansive, High-strength Grouting Mortar
Dai Yinsuo,Tan Yuehu,Yang Qingheng,Wang Zaihui,Ding Jiandang and Xie Jiangnan
DOI:10.11835/j.issn.1674-4764.2013.04.020
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2013,Pages 128-132
- Abstract
In order to solve the problem that the cement-based anchoring material has low early-strength and its volume contracts obviously, it is necessary to develop anchoring material which has characteristics of early-strength, expansion, high strength etc. Based on the ettringite with characteristic of early strong and expansion, the properties of the grouting mortars modified with alunite and gypsum were studied. The results show that at early stage the expansion is rapid and expansion is stabilized at later stage. The setting time can be controlled in 0.5～1.5 hours, and compressive strength of 1 day and 3 days reaches 20 and 40Mpa, respectively. The micro-analysis shows that with the increase of curing-time there are plenty of expansive ettringite crystals and porosity decreases. The limit load test shows that the pullout force of 1metre sample at 14 days is 93 KN, which is larger than the average lever of 1.5～2 meters samples.