Cement Admixture Composite for Rapid Expansion Hardening Type, On-site Hydration Concrete Mat Using the Cement Admixture Composite and Construction Method Using the Mat

摘要

The present invention relates to a cement admixture composition applied to an on-site hydration concrete mat, which is cured while exhibiting rapid expansibility in the initial stage, a fast-expansion hardening type cement admixture composition preferably using the same, an in-situ hydration concrete mat, and a preferred construction method of the concrete mat . The rapid water expansion hardening type cement mixture composition according to the present invention comprises: 25 to 65 wt% of crude cement having a specific surface area of 4,000-5,200 cm 2 /g; 5.0 to 20% by weight of calcined magnesium oxide powder having a specific surface area of 5,000 to 6,000 cm 2 /g; 0.1-0.6 wt% of a high-viscosity thickener having a viscosity of 45,000-65,000 cpa; 5.5-15 wt% of CSA-based clinker powder; Anhydrite 3.0-10 wt%; Dry silica sand 20-25 wt%; 0.2 to 2.0 wt% of a setting retarder; 0.3 to 1.6 wt% of a superplasticizer; Anti-foaming agent 0.2 to 0.8% by weight; characterized in that it comprises a composition. This rapid water expansion hardening type cement mixture composition can be filled in the space surrounded by the fiber cover and made into a roll-type on-site hydration concrete mat.