Experimental study was performed to investigate the effective stiffness and long-term deflection of concrete slabs subjected to loading at early age. From the tests of one-way slabs, long-term deflections were meas- ured. The test variables were the magnitude of loading,…
Experimental study was performed to investigate the effective stiffness and long-term deflection of concrete slabs subjected to loading at early age. From the tests of one-way slabs, long-term deflections were meas- ured. The test variables were the magnitude of loading, load pattern, reinforcement ratio, compression re-bars, and concrete age. The material properties of early age concrete resulting from cylinder tests were compared with the pre- dictions by current design code, ACI 209. The long-term deflections of the slab specimens were also compared with the predictions. The result showed that ACI 209 & 318 ove restimated the compressive strength and elastic modulus of the early age concrete cured at low temperature, and underestimated the long-term deflections of slabs.