Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of air entrainment on shrinkage of blended cements concretes
Highlights Shrinkage of air entrained (AE) concretes was higher than that of non AE concretes. Increase in shrinkage of concretes with increasing content of air voids was observed. Higher shrinkage might be due to air voids and porous air void–paste interface. Interconnection and overlapping of interfaces increased vapour diffusion and shrinkage. Bigger volume of cement paste in AE concrete may also increase shrinkage strains.
Abstract Shrinkage strains of air-entrained (AE) concretes were bigger than strains of non-air-entrained concretes made with the same cements. The results clearly showed an increase in strains with increasing content of air voids, regardless of cement type. Higher shrinkage strains of AE concretes may be most probably related to their microstructure of complex porosity and in particular, to porous cement paste adjacent to air void. Occurrence of air void–cement paste interfacial transition zones of higher porosity as well as their overlapping and interconnection may increase vapour diffusion accelerating moisture loss and drying shrinkage. Another likely reason for shrinkage increase may be increase in the volume of cement paste and decrease in the volume of aggregate in AE concrete.
Effect of air entrainment on shrinkage of blended cements concretes
Highlights Shrinkage of air entrained (AE) concretes was higher than that of non AE concretes. Increase in shrinkage of concretes with increasing content of air voids was observed. Higher shrinkage might be due to air voids and porous air void–paste interface. Interconnection and overlapping of interfaces increased vapour diffusion and shrinkage. Bigger volume of cement paste in AE concrete may also increase shrinkage strains.
Abstract Shrinkage strains of air-entrained (AE) concretes were bigger than strains of non-air-entrained concretes made with the same cements. The results clearly showed an increase in strains with increasing content of air voids, regardless of cement type. Higher shrinkage strains of AE concretes may be most probably related to their microstructure of complex porosity and in particular, to porous cement paste adjacent to air void. Occurrence of air void–cement paste interfacial transition zones of higher porosity as well as their overlapping and interconnection may increase vapour diffusion accelerating moisture loss and drying shrinkage. Another likely reason for shrinkage increase may be increase in the volume of cement paste and decrease in the volume of aggregate in AE concrete.
Effect of air entrainment on shrinkage of blended cements concretes
Piasta, Wojciech (Autor:in) / Sikora, Hubert (Autor:in)
Construction and Building Materials ; 99 ; 298-307
16.09.2015
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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