FENG Wei, JIA Jin-sheng, MA Feng-ling (China Institute of Water Resources and Hydropower Research, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China)

Abstract: A series of experiments were made to test the frost-resistance (including frost-resistance in air and frost-resistance in water) and impermeability of CSG and a new type of protective materials. Results show that the impermeability level of CSG without additive cured for 180d can reach W8, and the CSG cure for 90d was destroyed in less than 25 freezing-thawing cycles in water while was not destroyed in over 600 cycles in air. For the CSG with additive, the impermeability level at 180d can reach W12, and it was destroyed in over than 75 freezing-thawing cycles in water while was not destroyed in over 350 cycles in air. Therefore additive is recommended in CSG mixing design. Tests on a new type of protective materials show that CSG adding grout and CSG with more cementitious materials both have good impermeability levels (over W10) and frost-resistance (F300) and can be used as protective layers in CSG dams.

Key words: cemented sand and gravel, dam materials, protective materials, durability

Published in: Journal of Hydraulic Engineering, Vol. 44, No. 4, 2013