| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cement mortar composition for grout which gives excellent flow properties and has suitable length change rate and high strength capacity. <P>SOLUTION: The cement mortar composition for grout comprises cement, an expansive additive, a plaster, pozzolana fine powder, a water reducing agent and a fine aggregate; wherein the expansive additive is a calcium aluminoferrite based expansive additive; the pozzolana is a silica-based fine powder containing at least 90% of silicate dioxide (SiO<SB>2</SB>) and having a hydrogen ion concentration in an acid region; and the reducing agent is a polycarboxylic acid-based reducing agent. The expansive additive has preferably a Blain specific surface area of 2,000-6,000 cm<SP>2</SP>/g. The plaster is an anhydrous gypsum and has preferably a Blaine specific surface area of 3,000-6,000 cm<SP>2</SP>/g and the fine aggregate is a heavy weight aggregate having a density of at least 3.0 g/cm<SP>3</SP>. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
