期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 23, 期 3, 页码 1287-1291出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2008.07.019
关键词
Two-stage crushing process; Stone enveloped with pozzolanic powder; Slump; Compressive strength; Flexural strength; Microstructure of ITZ
资金
- Hunan Provincial Education Department [06C113]
A two-stage crushing process was utilized to produce recycled aggregate (RA). The slump of concrete mixes prepared by technique of stone enveloped with pozzolanic powder (SEPP) was compared with those using normal mixing approach (NMA) or stone enveloped with portland cement (SEPC) approach. After 7 and 28 days curing, the compressive and flexural strengths were tested. The slump and strength results indicate that the new mixing technique contributes significantly to better workability and higher compressive and flexural strengths. The interfacial transition zone of recycled aggregate concrete was observed by a scanning electro microscope (SEM). The SEM results verify that the new mixing technique benefits to a denser interfacial transition zone. (C) 2008 Elsevier Ltd. All rights reserved.
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