During the last decades, the concrete maturity method has been developed and used as one of the most favoured methods to estimate insitu concrete strength. To establish the concrete strength-maturity model, the concrete trial room in a laboratory environment was air-conditioned to achieve a cyclic environment condition, simulating the low curing temperature (5°C ~ 15°C) in winter and higher temperature (22°C ~ 34°C) in summer. A temperature-matched curing system was applied to secure sufficient cylinders for testing compressive strength with time. Simultaneously, the maturity was calculated by the Saul-Nurse maturity function to develop the strength-maturity models, which were further assessed by field trials prior to the field application. It was noted that strength-maturity models built were valid to estimate the early age strength with an error of 5%.
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