Abstract

The present work is the outcome of two years of investigations for the effect of incorporation of coarse recycled concrete aggregate (RA) in self-compacting high-strength concrete (SCHSC). By destructive and non-destructive methods; the compressive strength for SCHSC mixes with the incorporation of three different proportions of RA has been studied at various ages for up to two years. In addition, the residual compressive strength has been investigated after exposure to freezing-thawing cycles or to elevated temperature and correlations have been proposed between the compressive strength and ultrasonic pulse velocity (UPV). Thus, the compressive strength can be indirectly evaluated by knowing the measuring of the UPV. The hydration level of the adhered mortar attached to the RA and its quality affect the performance of concrete. Meanwhile, SCHSC is one of the best options for raising up the sustainability of concrete.

中文翻译：

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长期和暴露于冰冻或高温后再生骨料混凝土抗压强度的间接评估

摘要

目前的工作是对在自密实高强度混凝土 (SCHSC) 中掺入粗再生混凝土骨料 (RA) 的影响进行两年调查的结果。通过破坏性和非破坏性方法；SCHSC 混合三种不同比例的 RA 的抗压强度已在不同年龄阶段进行了长达两年的研究。此外，还研究了暴露于冻融循环或高温后的残余抗压强度，并提出了抗压强度与超声脉冲速度 (UPV) 之间的相关性。因此，可以通过了解 UPV 的测量来间接评估抗压强度。附着在 RA 上的粘结砂浆的水化程度及其质量会影响混凝土的性能。同时，