High Quality Recycled Aggregate Concrete (HiRAC) Processed by Decompression and Rapid Release

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI:10.14359/10597

H. Tamura, A. Nishio, J. Ohashi, K. Imamoto

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引用次数: 19

Abstract

Quality of concrete with recycled aggregate is generally lower than that of virgin aggregate. The main reason is that, recycled aggregate with its higher water absorption property has more porous mortar matrix around than that of the virgin aggregate and hence develops an inferior bond. In order to improve the quality of recycled aggregate concrete, an innovative method is proposed in this paper. High quality recycled aggregate concrete (HiRAC) can be obtained through a decompression and rapid release (DC-RR) procedure applied after normal mixing of concrete with recycled aggregate. Through the DC-RR procedure, the quality of transition zone between aggregate and cement matrix can be dramatically improved. In this paper, experimental studies are described on the effectiveness of DC-RR procedure on some of the mechanical and physical properties of recycled aggregate concrete. It was found that, by applying the DC-RR procedure, compressive strength of recycled aggregate concrete can be increased by about 20%; creep and carbonation depth can be reduced by about 20% and 30%, respectively.

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高质量再生骨料混凝土(HiRAC)的减压快速释放处理

再生骨料混凝土的质量一般低于原骨料。主要原因是再生骨料吸水性能高，其周围多孔砂浆基质比原生骨料多，粘结性较差。为了提高再生骨料混凝土的质量，本文提出了一种创新的方法。高质量的再生骨料混凝土(HiRAC)可以通过减压和快速释放(DC-RR)程序应用后，混凝土与再生骨料的正常混合。通过DC-RR工艺，可以显著提高骨料与水泥基体过渡区的质量。本文对DC-RR工艺对再生骨料混凝土某些力学和物理性能的影响进行了实验研究。研究发现，采用DC-RR工艺，再生骨料混凝土抗压强度可提高20%左右;蠕变和碳化深度可分别降低约20%和30%。

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"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference"

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