Abstract
The influence of different ceramsite pre-wetting time and the floating beads content on the properties of lightweight high-strength concrete was studied in this paper. The results showed that as the pre-wetting time increased, the absorption rate of ceramsite continued to increase, reaching a saturated state at 12 h with 36.14% water absorption rate; the concrete slump/expansion degree is increased significantly, and the growth rate decreased gradually, and the improvement was not obvious after 12 h; the 7 d strength of concrete saw an obvious downturn, and the strength dropped by 10.4% at 12 h, after which the decline was basically stable; the 28 d strength, 28 d strength growth rate and 7 d-28 d strength growth rate all showed a steady upward trend, which reached 61.18 MPa, 12.4% and 29.73% respectively at 12 h, and the growth rate was basically stable afterwards; as the floating beads content increased, the concrete dry density, slump/expansion degree, 7 d and 28 d strength all showed a significant decline trend.
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