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Laboratory and Field Test on Tunnel Rock Masses Grouting
Grouting is a mainly method to weak, poor, or water-rich rock masses in tunnel engineering, through laboratory test, systematically analyzes the influence of water-cement ratio for gelling time and slurry compressive strength with three kind of single cement, which are Ordinary Portland cement, HSC cement, TGRM cement. Results show that the gel time is increases with water-cement ratio increases, and the compressive strength is reduces as water-cement ratio increases. It's verified in field test also. Since the excessive water-cement ratio will lead to a overlong gel time and a low compressive strength. Grouting in site not only consider the strength of the slurry, also the slurry grouting feasibility. Laboratory test gives reasonable single cement water-cement ratio. Whereas TGRM and HSC grouting has obvious anti-dispersion, higher compressive strength, its water-cement ratio can raise properly. The cement-silicate double composition slurry test shows that the compressive strength of the grout is decreasing with increasing water-cement ratio and increasing with the increasing concentration of sodium silicate. The double composition slurry effect is better than single in compressive strength and gel time with same mixing proportion. Finally, the blocking effect of each kind of cement is detected in field for an express highway tunnel with poor, water-ingress rock masses.
Laboratory and Field Test on Tunnel Rock Masses Grouting
Grouting is a mainly method to weak, poor, or water-rich rock masses in tunnel engineering, through laboratory test, systematically analyzes the influence of water-cement ratio for gelling time and slurry compressive strength with three kind of single cement, which are Ordinary Portland cement, HSC cement, TGRM cement. Results show that the gel time is increases with water-cement ratio increases, and the compressive strength is reduces as water-cement ratio increases. It's verified in field test also. Since the excessive water-cement ratio will lead to a overlong gel time and a low compressive strength. Grouting in site not only consider the strength of the slurry, also the slurry grouting feasibility. Laboratory test gives reasonable single cement water-cement ratio. Whereas TGRM and HSC grouting has obvious anti-dispersion, higher compressive strength, its water-cement ratio can raise properly. The cement-silicate double composition slurry test shows that the compressive strength of the grout is decreasing with increasing water-cement ratio and increasing with the increasing concentration of sodium silicate. The double composition slurry effect is better than single in compressive strength and gel time with same mixing proportion. Finally, the blocking effect of each kind of cement is detected in field for an express highway tunnel with poor, water-ingress rock masses.
Laboratory and Field Test on Tunnel Rock Masses Grouting
Weng, Qineng (author) / Zhang, Jianwei (author) / Zhang, Qianguan (author)
Third International Conference on Transportation Engineering (ICTE) ; 2011 ; Chengdu, China
ICTE 2011 ; 1892-1897
2011-07-13
Conference paper
Electronic Resource
English
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