CEMENT COMPOSITION FOR GROUTING AND GROUT MATERIAL COMPRISING THE SAME

摘要

A cement composition for grouting which has excellent flowability, is prevented from bubbling, retains an appropriate length change and volume expansion, and has high-strength performance; and a grout material comprising the cement composition. The cement composition for grouting comprises a cement, expanding materials, a fine pozzolan powder, a blowing agent, and two or more water-reducing agents selected from the group consisting of naphthalenesulfonic acid water-reducing agents, melaminesulfonic acid water-reducing agents, lignoesulfonic acid water-reducing agents, and polycarboxylic acid water-reducing agents (provided that a combination of a naphthalenesulfonic acid water-reducing agent and a polycarboxylic acid water-reducing agent is excluded), and is characterized in that the expanding materials comprise a calcium aluminoferrite expanding material having a Blaine specific surface area of 2,000 cm<SUP>2</SUP>/g or larger and a calcium sulfoaluminate expanding material having a Blaine specific surface area exceeding 4,500 cm<SUP>2</SUP>/g.