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The influence of recycled aggregates from precast elements on the mechanical properties of structural self-compacting concrete

机译：预制构件再生骨料对结构自密实混凝土力学性能的影响

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摘要

Recycled Aggregates (RA) from structural precast elements and the performance of Self-Compacting Concrete (SCC) containing RA in percentage substitutions of 20%, 50% and 100% are described in this paper. Three Control Concretes (CC-30, CC-37.5, CC-45) manufactured with Natural Aggregates (NA), and their corresponding Recycled Aggregate Concretes (RAC-20, RAC-50, RAC-100) are evaluated in terms of physical and mechanical properties. The in-fresh properties results (flowability, viscosity and passing ability) of the RAC were suitable for their use as SSC. Furthermore, the tests of compressive, splitting tensile and flexural strength, as well as density, porosity, water absorption, ultrasonic pulse velocity, stiffness, and both dynamic and static modulus provided results close to those of the SCC with NA, and in compliance with the requirements of current regulations. The recycling process that takes place in the precast factory supposes an economical improvement and an important contribution to global sustainability, in accordance with the concept of the circular economy. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文描述了来自结构预制构件的再生骨料（RA）以及以20％，50％和100％的百分比替代率包含RA的自密实混凝土（SCC）的性能。对三种由天然骨料（NA）制造的对照混凝土（CC-30，CC-37.5，CC-45）及其相应的再生骨料混凝土（RAC-20，RAC-50，RAC-100）进行了物理和混凝土评估。机械性能。 RAC的新鲜特性结果（流动性，粘度和通过能力）适合用作SSC。此外，抗压强度，劈裂强度和挠曲强度以及密度，孔隙率，吸水率，超声脉冲速度，刚度以及动态模量和静态模量的测试提供的结果与带有NA的SCC接近，并且符合当前法规的要求。根据循环经济的概念，在预制工厂中进行的循环利用过程在经济上取得了进步，并为全球可持续发展做出了重要贡献。 （C）2018 Elsevier Ltd.保留所有权利。

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