Abstract
An experimental program was undertaken to determine the effect of casting rate and concrete temperature on formwork lateral pressure that can be developed by self-consolidating concrete (SCC). Concrete mixtures prepared with initial temperatures varying from 10 to 30∘C or with high early-strength cement and set-accelerating admixture were evaluated. The concrete was placed either continuously at casting rates varying between 5 and 25 m /h or by stopping the placement for some predetermined periods of time.
Test results show that the increase in casting rate from 5 to 25 m/h can lead to 15% increase in initial formwork pressure; however, no significant effect on the rate of pressure drop with time is observed. The variations in fresh concrete temperature have limited effect on the initial lateral pressure; however, the rate of pressure drop was significantly increased with the increase in temperature. The time for the cancellation of pressure is directly affected by the concrete temperature and materials in use, and occurs shortly after the end of the dormant period of cement hydration.
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Assaad, J.J., Khayat, K.H. Effect of casting rate and concrete temperature on formwork pressure of self-consolidating concrete. Mater Struct 39, 333–341 (2006). https://doi.org/10.1007/s11527-005-9042-3
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DOI: https://doi.org/10.1007/s11527-005-9042-3