Abstract
High-early-strength-concrete (HESC) made of Type III cement reaches approximately 50–70 % of its design compressive strength in a day in ambient conditions. Experimental investigations were made in this study to observe the effects of temperature, curing time and concrete strength on the accelerated development of compressive strength in HESC. A total of 210 HESC cylinders of 100 × 200 mm were tested for different compressive strengths (30, 40 and 50 MPa) and different curing regimes (with maximum temperatures of 20, 30, 40, 50 and 60 °C) at different equivalent ages (9, 12, 18, 24, 36, 100 and 168 h). From a series of regression analyses, a generalized rate-constant model was presented for the prediction of the compressive strength of HESC at an early age for its future application in precast prestressed units with savings in steam supply. The average and standard deviation of the ratios of the predictions to the test results were 0.97 and 0.22, respectively.
Highlights
E Activation energy in generalEeq Activation energy (=33,500 J/mol) used in the estimation of teq fc0d Design compressive strength k Rate constant of concrete kr Rate constant at reference temperature, Tr R Universal gas constant (=8.314 J/mol/K)
Steam curing accelerates hydration of concrete and allows the concrete to reach prestress levels of compressive strength in a short time
For precast prestressed concrete industry, method of steam curing is widely applied to concrete members made of Type I cement on behalf of the massive production and accelerated production rate in response to demand (Erdogdu and Kurbetci 1998; Erdem et al 2003; Hanson 1963; Higginson 1961)
Summary
Eeq Activation energy (=33,500 J/mol) used in the estimation of teq fc0d Design compressive strength k Rate constant of concrete kr Rate constant at reference temperature, Tr R Universal gas constant (=8.314 J/mol/K). This article is published with open access at Springerlink.com
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