| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground impervious wall construction material suitable for constructing an underground impervious wall for confining a contaminated material by forming an excavation groove so that the groove surrounds a contaminated ground and charging the groove by pouring soil cement into the groove.SOLUTION: An underground impervious wall construction material used for constructing an underground impervious wall 5 for confining a contaminated material by forming an excavation groove 3 so that the groove surrounds a contaminated ground 1 and charging the groove 3 by pouring soil cement 4 into the groove 3 is made of a stirred mixture of cement, sand, bentonite, a plasticizer, and water. Mixing weight ratios between the cement, sand, and bentonite are within ranges of 10 to 16 parts by weight of the sand and 0.2 to 1 part by weight of the bentonite relative to 1 part by weight of the cement. The soil cement has a water permeability coefficient after hardening equal to or smaller than 1×10cm/s, and a flow value after 4 hours after kneading and mixing equal to or larger than 160 mm. |
