INFLUENCE OF ENVIRONMENTAL EFFECTS ON THE HIGH STRENGTH NORMAL AND LIGHTWEIGHT CONCRETE
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Published:2002
Cornelia Măgureanu, A Popa, 2002. "INFLUENCE OF ENVIRONMENTAL EFFECTS ON THE HIGH STRENGTH NORMAL AND LIGHTWEIGHT CONCRETE", Innovations and Developments In Concrete Materials And Construction: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Peter C. Hewlett, Laszlo J. Csetenyi
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The paper describes a study undertaken to examine the effect of environmental conditions on the evolution of drying shrinkage of normal and lightweight aggregates concrete. Further, the effect of curing conditions was investigated for different medium and high-strength lightweight concrete. The compressive strength at 28 days range from 25 MPa to 60 MPa. The investigation of long – term shrinkage behaviour was undertaken with following environmental conditions: seven days in water and after in constant relative humidity and temperature (U = 60 ± 5 % ; t = 20°C + 2° C); steam curing; constant relative humidity and temperature; entirely isolated to medium; relative humidity range of 50% to 80% and 60% to 100% (respective to alternatively in air and water); variable condition. The normal aggregates high – strength concrete are continuously moist cured (at 100% relative humidity) for 7 days and for 28 days, and than allowed to dry at 60% ± 5 % relative humidity and 20°C ± 2°C temperature.
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