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Recycled aggregate concrete as structural material

机译：再生骨料混凝土作为结构材料

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摘要

The use of recycled aggregates in concrete opens a whole new range of possibilities in the reuse of materials in the building industry. The utilisation of recycled aggregates is a good solution to the problem of an excess of waste material, provided that the desired final product quality is reached. The studies on the use of recycled aggregates have been going on for 50 years. In fact, none of the results showed that recycled aggregates are unsuitable for structural use. However, some hypothetical problems related to durability aspects resulted in recycled aggregates being employed practically only as base filler for road construction. This paper focuses on the possibility of the use of recycled aggregate concrete as a structural material. For that purpose an experimental study of the shear behaviour and strength of beams made with recycled aggregate concrete was studied. Twelve beam specimens with the same compression strength, four concrete mixtures using different percentages of recycled coarse aggregates (0%, 25%, 50% and 100%) and three different transverse reinforcement arrangements were cast and tested up to failure. Analytical predictions of the experimental results were carried out using a numerical model based on the modified compression field theory and simplified models such as those proposed by Cladera & Mari, the Canadian standard CSA and the Eurocode-2. The results obtained indicate that a substitution of less than 25% of coarse aggregate, scarcely affects the shear capacity of RC beams, provided that all measures related to dosage and durability aspects have been adopted.
机译：在混凝土中使用再生骨料为建筑业中的材料再利用提供了全新的可能性。只要达到所需的最终产品质量，回收骨料的利用就可以很好地解决废料过多的问题。关于使用再生骨料的研究已经进行了50年。实际上，没有结果表明回收的骨料不适合用于结构用途。但是，与耐久性有关的一些假设问题导致回收的骨料实际上仅用作道路建设的基础填料。本文着重于将再生骨料混凝土用作结构材料的可能性。为此，对再生骨料混凝土梁的抗剪性能和强度进行了实验研究。浇铸十二个具有相同抗压强度的梁试样，使用不同百分比的再生粗骨料（0％，25％，50％和100％）的四种混凝土混合物以及三种不同的横向钢筋布置，并进行试验直至破坏。使用基于改进压缩场理论的数值模型和简化模型（例如Cladera＆Mari，加拿大标准CSA和Eurocode-2提出的模型）对实验结果进行分析预测。获得的结果表明，如果采用了与剂量和耐久性有关的所有措施，则少于25％的粗骨料的替代几乎不会影响RC梁的剪切能力。

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