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The Influence of Heat and Mechanical Treatment of Concrete Rubble on the Properties of Recycled Aggregate Concrete

机译：混凝土瓦砾的热处理和机械处理对再生骨料混凝土性能的影响

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Concrete is a building material commonly used for ages. Therefore, in the result of repairs or demolition of building structures, large amounts of concrete rubble are created, which requires appropriate management. The aim of the realized research was to determine the influence of heat and mechanical treatment of concrete rubble on the properties of recycled aggregate concrete. The research experiment included 12 series, with three variables: X1—roasting temperature (300, 600, 900 °C), X2—time of mechanical treatment (5, 10, 15 min), X3—content of coarse recycled aggregates (20, 40, 60% by volume). Two additional series containing recycled aggregate without treatment and natural aggregate were also prepared. Established properties of individual aggregates have confirmed a positive effect of thermo-mechanical treatment. Then, based on the results of compressive strength, flexural strength, Young’s modulus, volumetric density, water absorption, water permeability and capillarity, the most favourable parameters of heat and mechanical treatment of concrete were determined. The test results showed that appropriate treatment of concrete rubble allows to obtain high-quality coarse aggregate and valuable fine fraction. This was also confirmed by the macro- and microscopic observations of the aggregate and separated cement paste. Works realized on the concrete recycling method resulted in obtaining a patent PAT.229887.
机译：混凝土是常年使用的建筑材料。因此，由于建筑结构的修理或拆除的结果，产生了大量的混凝土瓦砾，这需要适当的管理。本研究的目的是确定混凝土瓦砾的热处理和机械处理对再生骨料混凝土性能的影响。研究实验包括12个系列，具有三个变量：X1-焙烧温度（300、600、900°C），X2-机械处理时间（5、10、15分钟），X3-粗粒再生骨料的含量（20， 40％（体积）。还准备了另外两个包含未经处理的再生骨料和天然骨料的系列。各个聚集体的既定性能已确认了热机械处理的积极作用。然后，基于抗压强度，抗弯强度，杨氏模量，体积密度，吸水率，透水性和毛细作用的结果，确定了混凝土的最佳热处理和机械处理参数。试验结果表明，对混凝土瓦砾进行适当的处​​理可以得到高质量的粗骨料和有价值的细碎料。骨料和分离的水泥浆的宏观和微观观察也证实了这一点。在混凝土回收利用方法方面的工作取得了专利PAT.229887。

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