| 摘要 |
PURPOSE:To prevent the efflorescence of a hardened body and to improve the lowering of fluidity at a low temp. by adding a specific cement dispersing agent into a self-leveling water based composition containing a based material, water, an aggregate, a thickener and a deforming agent, placing and hardening. CONSTITUTION:The self-leveling water based composition is obtained by blending water, the aggregate, the thickener and the defoaming agent with the base material composed of a cement and gypsum or the cement and an expanding agent. This hardened body is obtained by adding 0.00005-0.005 pt.wt. polyoxyalkylene modified silicone, which is constituted of dimethyl siloxane unit and siloxane unit having polyoxyalkylene modified group directly bonded with Si and has 0.5-3.5Pa.sec viscosity (25 deg.C), and 0.05-3wt.% cement dispersing agent composed of the water soluble vinyl copolymer containing 50-90mol% structural unit expressed by a formula (R<1> is H or CH2COOM<1>, M<1> is cation selected from alkali (alkaline earth) metal and organic amine) into the composition of 100 pts.wt., placing and hardening. |
