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Porosity of recycled concrete with substitution of recycled concrete aggregate An experimental study

机译：再生混凝土骨料代替再生混凝土的孔隙率实验研究

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摘要

In this paper, we present the experimental analysis of samples of recycled concrete (RC) with replacement of natural aggregate (NA) by recycled aggregate originating from concrete (RCA). The results of the tests of mechanical properties of RC were used for comparison with tests of mercury intrusion porosimetry (MIP), in which the distribution of the theoretical pore radius, critical pore ratio, the surface area of the concrete, threshold ratio and average pore radius were studied at ages of 7, 28 and 90 days. The results showed some variation in the properties of the RC with respect to ordinary concrete. Porosity increases considerably when NA is replaced by RCA. Additionally, a reduction in the mechanical properties of the RC is seen compared with ordinary concrete when porosity increases.
机译：在本文中，我们介绍了对再生混凝土（RC）样品进行的实验分析，其中天然混凝土（NA）被源自混凝土（RCA）的再生骨料代替。 RC力学性能的测试结果与水银压入孔隙率法（MIP）的测试结果进行了比较，其中理论孔隙半径，临界孔隙率，混凝土表面积，阈值比和平均孔隙率的分布在7、28和90天的年龄研究了半径。结果表明，相对于普通混凝土，RC的性能有所不同。当用RCA代替NA时，孔隙率会大大增加。另外，当孔隙率增加时，与普通混凝土相比，RC的机械性能下降。

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