Experimental Investigation on Permeability control in Contact Grouting Using Crystalline Admixture for Tunneling Application
Keywords:
Grouting, Permeability, Quality assurance, tunnelAbstract
This study investigates the effectiveness of crystalline waterproofing admixture MB LIFE WP760 in controlling permeability and improving performance of contact grouting materials for tunneling applications. Contact grouting plays a crucial role in reducing water ingress, filling voids between the lining and surrounding ground, and enhancing structural stability. However, conventional grout mixes often face limitations such as inadequate permeability resistance and variable strength development. In this research, grout samples incorporating 0.8% MB LIFE WP760& 1% Mudrock Chemi flow 100 were evaluated against control mixes to assess improvements in fresh and hardened properties. Key parameters such as viscosity, density, setting time, bleeding, compressive strength, and water penetration were studied in accordance with relevant IS standards. Results indicate that the admixture maintains desirable workability, with only marginal variations in viscosity and setting time. The modified grout exhibits slightly higher early and long-term compressive strength compared to the control mix. The findings confirm that MB LIFE WP760 enhances durability and impermeability of grout mixes without compromising mechanical performance. The study concludes that incorporating crystalline admixtures in contact grouting presents a promising approach for improving waterproofing efficiency and long-term stability in tunnel construction.
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