期刊
CEMENT AND CONCRETE RESEARCH
卷 35, 期 3, 页码 445-448出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2004.07.009
关键词
shrinkagge-reducing admixture; synthesis; concrete; shrinkage; evaluation
This paper describes a chemical process called ethoxylation to synthesize a shrinkage-reducing admixture (SRA). Using 2-butoxy ethanol and ethylene oxide (EO) or propylene oxide (PO), SRA was synthesized in a laboratory. SRA has a great reducing effect on the surface tension of its solution. Reduced free drying shrinkage (FDS) rate can be measured with the increment of dosage for both mortar and concrete. At 2% dosage, free drying shrinkage can be decreased by 30-40% for both mortar and concrete specimens at 60 days. It also reduces autogenous shrinkage for mortar about 20-30% at 90 days with 2% dosage. Comparing with expansive admixture, SRA performance was better than expansive admixture when no water curing is undertaken. (c) 2004 Elsevier Ltd. All rights reserved.
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