Water-repellent Admixture for Reducing Shrinkage Binder Composition for Repair Mortar with the Chemical Resistance Comprising the Admixture Dry Mortar Composition Comprising the Binder and Concrete Repair Method Using the Mortar

摘要

The present invention relates to a water-repellent shrinkage reduction admixture capable of improving water repellency and dry shrinkage reduction performance when being incorporated into cement mortar, a bonding composition for chemical resistant cross-section repair mortar preferably including the admixture, a dry mortar composition desirably including the bonding material, and a concrete cross-section repair construction method desirably using the dry mortar. The water-repellent shrinkage reduction admixture according to the present invention has a specific gravity of less than or equal to 2.20 and fineness of 5,500-9,000 cm^2/g by pulverizing and mixing the composition including a dispersing inorganic filler, an anti-aggregation agent, a water repellent agent, and a shrinkage reducing agent in a pulverizer. The bonding composition for chemical resistant cross-section repair mortar according to the present invention generally comprises: 30-80 wt% of Portland cement, 2-10 wt% of rapid hardening cement, 2-8 wt% of water-repellent shrinkage reduction admixture, 3-8 wt% of expansion agent, 2-10 wt% of anhydrous gypsum, 5-40 wt% of blast furnace slag fine powder, and 0.3-3 wt% of alkali sulfate.