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Mechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates

机译：再生混凝土粗骨料制成的混凝土的力学和弹性性能

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摘要

In this paper an investigation of mechanical behaviour and elastic properties of recycled-aggregate concretes is presented. These concretes were prepared by alternatively using two different (coarse and finer coarse) recycled-aggregate fractions both made of recycled concrete coming from a recycling plant in which rubble from demolition is collected and suitably treated. Several concrete mixtures were prepared by using only virgin aggregates (as reference), 30% finer coarse recycled aggregate replacing fine gravel and 30% coarse recycled aggregate replacing gravel. Five different water to cement ratios were adopted as: 0.40, 0.45, 0.50, 0.55 and 0.60. Concrete workability was in the slump range of 190-200 mm. Compression tests were carried out after 28 days of wet curing. In addition, concrete elastic modulus and drying shrinkage were evaluated. Results obtained showed that structural concrete up to C32/40 strength class can be manufactured by replacing 30% virgin aggregate with recycled-concrete aggregate. Moreover, a correlation between elastic modulus and compressive strength of recycled-aggregate concrete was found and compared to those reported in the literature. Finally, on the basis of drying shrinkage results, particularly if finer coarse recycled-concrete aggregate is added to the mixture, lower strains could be detected especially for earlier curing time.
机译：本文研究了再生骨料混凝土的力学性能和弹性性能。这些混凝土是通过交替使用两种不同的（粗的和较细的，较粗的）再生骨料级分制备的，两者均由来自回收工厂的回收混凝土制成，在该工厂中，收集了拆除的碎石并进行了适当的处理。通过仅使用原始骨料（作为参考），用30％的细粗再生料代替细砾石和用30％的粗再生料代替砾石来制备几种混凝土混合物。采用五种不同的水灰比：0.40、0.45、0.50、0.55和0.60。混凝土的可加工性在190-200mm的坍落度范围内。湿固化28天后进行压缩测试。另外，评价了混凝土的弹性模量和干燥收缩率。所得结果表明，通过用再生混凝土骨料代替30％的原始骨料，可以生产强度等级达到C32 / 40的结构混凝土。此外，发现了再生骨料混凝土的弹性模量与抗压强度之间的相关性，并将其与文献中报道的相关性进行了比较。最后，基于干燥收缩率的结果，特别是如果将较细的粗再生混凝土集料添加到混合物中，则可以检测到较低的应变，尤其是对于较早的固化时间。

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