| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent generation of an initial defect in placing concrete. <P>SOLUTION: A biodegradable polymer water-absorbing gel having extremely high water absorbing property in the water-containing or saturated state is sprayed or applied onto a concrete surface in an extremely initial material age after placing concrete (S110) to thereby form a biodegradable polymer water-absorbing gel layer on the concrete surface (S120). Water absorbed already in the biodegradable polymer water-absorbing gel itself is dissipated precedently, to delay a progression time of moisture loss from a surface layer part of concrete in the extremely initial material age, and to thereby prevent drying from the surface layer part of the concrete in the extremely initial material age. Besides, drying from the surface layer part of the concrete in the extremely initial material age is suppressed by the biodegradable polymer water-absorbing gel layer, and excessive water from the surface layer part of the concrete is absorbed by the biodegradable polymer water-absorbing gel, to thereby densify a surface layer structure of the concrete. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
