Abstract
Orthogonal design was used to research the effect of water cement ratio and the content of expansive agent and fiber on the compressive strength, bending strength and splitting strength of high-strength micro-expansive lightweight aggregate concrete. The optimum mixing proportion of lightweight concrete considering different strength target was determined through the integrated balance method. Results indicated that, the splitting strength and bending strength was about 0.04 times and 0.08∼0.12 times as big as the compressive strength when the intensity grade of lightweight concrete was LC45 or LC50. The content of ZY expansive agent has a notable influence on compressive strength, and has certain influence on bending strength. The water cement ratio and polypropylene fiber content have no significant effect on different strength target. The optimum mixing proportion for high-strength micro-expansive lightweight aggregate concrete was that, the content of ZY expansive agent and polypropylene fiber were respectively 8% and 0.1%, and water cement ratio was 0.30. The strength grade of LC50 for the optimum mixing proportion has been achieved.
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