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Development of high freeze-thaw resistance steel fiber reinforced expansive shale lightweight concrete

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Document pages: 8 pages

Abstract: In order to popularize structural application, steel fiber reinforced expansive shale lightweight concrete (sfrelc) with high freeze-thaw resistance was developed. In this paper, the effects of air entrainment, steel fiber volume fraction and fine aggregate type are obtained. The results show that the mass loss rate of sfrelc changes little after 300 freeze-thaw cycles, but its relative dynamic elastic modulus and relative flexural strength show an obvious freeze-thaw resistance trend. Through the composite action of air entraining agent and steel fiber, sfrelc has high freeze-thaw resistance. Combined with the water permeability test results of sfrelc, its mechanism is discussed. Maybeeficial effect was appeared from the replacement of lightweight sand with manufactured sand. Based on the test results, suggestions are given out for the optimal mix proportion of SFRELC to satisfy the durability requirement of freeze-thaw resistance.

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