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Synthesis and evaluation of shrinkage-reducing admixture for cementitious materials

Rongbing, B. / Jian, S.

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.

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Synthesis and evaluation of shrinkage-reducing admixture for cementitious materials

Rongbing, B. / Jian, S.

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.

Synthesis and evaluation of shrinkage-reducing admixture for cementitious materials

Rongbing, B. / Jian, S.

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.

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Title:

Synthesis and evaluation of shrinkage-reducing admixture for cementitious materials

Contributors:

Rongbing, B. (author) / Jian, S. (author)

Published in:

Cement and Concrete Research ; 35 ; 445-448

Publication date:

2005

Size:

4 Seiten, 7 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.cemconres.2004.07.009

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Zement , Ethen , Oxid , Oberflächenspannung , Zugfestigkeit , Trocknen , Riss , Luftfeuchte , chemische Synthese , Trockenschwindung , Additiv , organische Verbindung

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