UNSLAKED LIME POWDER FOR EXPANSIVE MATERIAL, EXPANSIVE MATERIAL FOR CONCRETE, WATER-HARDENING TYPE BINDING MATERIAL, CONCRETE, AND METHOD OF CONSTRUCTING CONCRETE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an unslaked lime powder for an expansive material for an early stage form removal concrete capable of materializing sufficient expansion by hydration in a concrete structure even if a form is removed in an early stage of 2-3 days after placing concrete, and drastically reducing the generation of dry shrinkage and cracks. SOLUTION: The unslaked lime powder for the expansive material is an unslaked lime powder having an ignition loss of not greater than 6 mass%, containing not less than 90 mass% of CaO, having a Brain specific surface area of 3,000-7,000 cm2/g, and a BET specific surface area of the unslaked lime powder having a particle size within the range of 90μm-1 mm of not greater than 2.0 m2/g wherein a second heat evolving peak in a hydration heat evolving rate curve obtained by measuring a mixed powder using an isothermal conduction type calorimeter is appeared only on and after 2 hours after when contacting water, the mixed powder consisting of 75 mass% of a mixture of 75 mass% of the unslaked lime and 25 mass% of anhydrous gypsum, and 25 mass% of an ordinary portland cement. COPYRIGHT: (C)2009,JPO&INPIT