| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an ultrahigh-strength concrete product which is excellent in the dispersion properties of cement and the workability and moldability of concrete, in the same manner as the ultrahigh-strength concrete product obtained by using the conventional polycarboxylic acid-based high-performance water reducing agent is excellent in them, even when water of a low ratio of water to a binding material and a naphthalene-based high-performance water reducing agent are used. <P>SOLUTION: The ultrahigh-strength concrete product comprises, at the least, cement, an aggregate, water of 12-20% ratio of water to the binding material, silica fume having <15 m<SP>2</SP>/g specific surface area when measured by a BET method, and the naphthalene-based high-performance water reducing agent of 0.5-2.0 parts mass based on 100 parts mass binding material. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
