Abstract
In this paper, large areas of defects such as pitting surface and holes produced after pouring concrete in civil engineering are simulated. The orthogonal method is used to produce expansive concrete which has a higher strength grade and a smaller aggregate size than original concrete for repairing. The effects of different water reducing agent content, expansive agent content, fly ash content and sand ratio on freeze-thaw cycle are analyzed. Finally, it recommends the best concrete mixing proportion and verifies repairing effect by comparing with original concrete of nonrepair. Results indicate that the mixing proportion which means 5% expansive agent content, 1.2% water reducing agent content, 20% fly ash content and 30% sand rate can obtain good antifreeze effect. In addition, the influence of water reducing agent on freeze-thaw effect is more obvious than expansive agent. Moreover, a greater content of expansive agent can not lead to a better effect of freeze-thaw cycles.
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