Computers and Concrete

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The effects of different cement dosages, slumps and pumice aggregate ratios on the freezing and thawing of concrete

  • Turkmen, Ibrahim (Ataturk University, Engineering Faculty, Civil Engineering Department) ;
  • Demirboga, Ramazan (Ataturk University, Engineering Faculty, Civil Engineering Department) ;
  • Gul, Rustem (Ataturk University, Engineering Faculty, Civil Engineering Department)
  • Received : 2006.04.04
  • Accepted : 2006.06.19
  • Published : 2006.04.01
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Abstract

This research was conducted to determine effect of pumice aggregate ratio, cement dosage and slumps on freeze-thaw resistance, density, water absorption and elasticity of concrete. In the first batch, $300kg/m^3$ cement dosage were kept constant and pumice ratios were changed as 25%, 50%, 75% and 100% of replacement for normal aggregate by volume for $3{\pm}1cm$, $5{\pm}1cm$ and $7{\pm}1cm$ slumps. Other batches were prepared with $200kg/m^3$, $250kg/m^3$, $350kg/m^3$, $400kg/m^3$ and $500kg/m^3$ cement dosages and 25% pumice aggregate +75% normal aggregate at a constant slump. Test results showed that when pumice-aggregate ratio decreased the density and freeze-thaw resistance of concretes increased. With increasing of cement dosage in the mixtures, density of the concretes increased, however, freeze-thaw resistance of concretes decreased. Water absorption of the concrete decreased with increasing cement dosage but increased with the pumice ratio. Water absorption of the concrete also decreased after freeze-thaw cycles. Freeze-thaw resistance of concretes was decreased with increasing the slumps.

Keywords

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