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Influence of chemical admixtures on the drying shrinkage of concrete
The incorporation of chemical admixtures in concrete is common practice, especially in high performance concretes. These admixtures are designed to have specific effects on certain properties of the concrete , and are expected to have little or no negative effects on other aspects. One such admixture is the superplasticizer that is added to concrete in order to increase its workability in the fresh state, eliminating the need for increasing the water content. The effects of superplasticizers on the long-term properties of the hardened concrete have been studied to a very limited extent, and not much data is available on their effects on creep and shrinkage. In the present work, the influence of two different types of superplasticizers on the shrinkage of mortars is studied, along with another product belonging to an emerging class of chemical admixtures that are shrinkage reducing admixtures (SRAs). Work reported in the literature on concretes with SRAs clearly demonstrates the decrease in the drying shrinkage and a reduction in restrained shrinkage crack widths. The influence of an SRA, which also has a plasticizing effect in the fresh state, has been analyzed in the present work, especially in terms of the shrinkage of concrete under drying conditions.
Influence of chemical admixtures on the drying shrinkage of concrete
The incorporation of chemical admixtures in concrete is common practice, especially in high performance concretes. These admixtures are designed to have specific effects on certain properties of the concrete , and are expected to have little or no negative effects on other aspects. One such admixture is the superplasticizer that is added to concrete in order to increase its workability in the fresh state, eliminating the need for increasing the water content. The effects of superplasticizers on the long-term properties of the hardened concrete have been studied to a very limited extent, and not much data is available on their effects on creep and shrinkage. In the present work, the influence of two different types of superplasticizers on the shrinkage of mortars is studied, along with another product belonging to an emerging class of chemical admixtures that are shrinkage reducing admixtures (SRAs). Work reported in the literature on concretes with SRAs clearly demonstrates the decrease in the drying shrinkage and a reduction in restrained shrinkage crack widths. The influence of an SRA, which also has a plasticizing effect in the fresh state, has been analyzed in the present work, especially in terms of the shrinkage of concrete under drying conditions.
Influence of chemical admixtures on the drying shrinkage of concrete
Einfluß chemischer Zusätze auf die Trockenschwindung von Beton
Gettu, R. (author) / Roncero, J. (author) / Carol, I. (author) / Martin, M.A. (author)
EUROMAT, EUROMAT, 1999 ; 48-53
2000
6 Seiten, 4 Bilder, 2 Tabellen, 4 Quellen
Conference paper
English
Influence of Chemical Admixtures on the Drying Shrinkage of Concrete
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