Treatments for the improvement of recycled aggregate

被引：419

作者：

Katz, A ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Civil Engn, Natl Bldg Res Inst, IL-32000 Haifa, Israel

来源：

JOURNAL OF MATERIALS IN CIVIL ENGINEERING | 2004年 / 16卷 / 06期

关键词：

D O I：

10.1061/(ASCE)0899-1561(2004)16:6(597)

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The microstructure of recycled aggregate prepared from the crushing of old concrete was studied. It was found that the recycled aggregate is covered with loose particles that may prevent good bonding between the new cement matrix and the recycled aggregate. The old cement paste that remained on the natural aggregate was porous and cracked, leading to weak mechanical properties of the recycled aggregate. Treatment of the recycled aggregate by impregnation of silica fume solution and by ultrasonic cleaning was studied with the objective of overcoming the above-mentioned limitations. An increase of similar to30 and similar to15% in the compressive strength at ages 7 and 28 days was observed after the silica fume treatment. Ultrasonic treatment led to an improvement of similar to7%.

引用

页码：597 / 603

页数：7

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