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鉴于废弃混凝土的日益增多和危害,迫切需要合理开发和科学利用。针对再生粗骨料(RA)来源的多途径和品质差异及其对再生骨料混凝土(RAC)质量的影响,探讨不同来源再生骨料对再生骨料混凝土的立方体抗压强度(frcu)和棱柱体抗压强度(frc)的影响,选取最具典型代表的旧房拆迁、高强桩基、市政工程和科学研究等4种来源的废弃混凝土,经破碎加工成4种再生粗骨料,并作净化和预湿处理后,分别选取25%、50%、75%和100%4种取代率,按相关标准配置成4种再生骨料混凝土,经标准试验测其立方体抗压强度和棱柱体抗压强度。结果表明,再生粗骨料取代率对立方体抗压强度和棱柱体抗压强度影响较大,而不同再生粗骨料来源对立方体抗压强度和棱柱体抗压强度影响并不明显;矿物掺合料是影响棱柱体抗压强度的另一重要因素。
In view of the increasing number and harm of abandoned concrete, there is an urgent need for rational development and scientific utilization. According to the different sources and quality of recycled coarse aggregate (RA) and their influence on the quality of recycled aggregate concrete (RAC), the cubical compressive strength (frcu) and prismatic Body compressive strength (frc), select the most representative of the demolition of old houses, high-strength pile, municipal engineering and scientific research, four kinds of waste concrete, crushed into four kinds of recycled coarse aggregate, and for Purification and pre-wet treatment, respectively, the 25%, 50%, 75% and 100% of the four kinds of substitution rate, according to the relevant standard configuration into four kinds of recycled aggregate concrete, the standard test measured cube compressive strength and prism resistance Pressure intensity. The results show that the replacement rate of recycled coarse aggregate has a great influence on the compressive strength of cubes and the compressive strength of prismatic bodies, while the source of different recycled coarse aggregates has no obvious effect on the compressive strength of cubes and the compressive strength of prisms. Material is another important factor affecting the compressive strength of the prism.