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中文摘要：
设计并完成了再生粗骨料已使用年限分别为0、10、40年和取代率分别为0、30％、50％、70％、100％的C30级再生混凝土的立方体抗压强度、劈裂抗拉强度和抗折强度相关试验，并以天然骨料混凝土作为基准进行对比分析。试验结果表明：再生混凝土立方体抗压强度、劈裂抗拉强度和抗折强度破坏过程和破坏形态与普通混凝土基本一致，在水灰比相同的情况下，再生混凝土立方体抗压强度高于普通混凝土，劈裂抗拉强度低于普通混凝土，抗折强度基本接近普通混凝土；另外，还表明再生粗骨料的寿命对再生混凝土强度有一定影响。
英文摘要：
The cube compressive strength, splitting tensile strength and flexural strength of C30-1evel recycled concrete were tested,which is based on the testes of natural concrete.The kinds of recycled aggregates＇ service lives are 0 year, 10 years and 40 years, and the substitution rates are 30%, 50%, 70%and 100%.The experimental results indicate that the fracture morphology and process of the cube compressive strength, splitting tensile strength and flexural strength of the recycled concrete are consistent with the ones of the natural concrete.In the case of the same water-cement ratio, the cube compressive strength of recycled concrete is higher than the ordinary one, and the splitting tensile strength is lower than the ordinary one.The flexural strength of the recycled concrete is higher than the ordinary one; In addition,it indicates that the concrete strength will be influenced by the life of recycled coarse aggregate.
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