Pawluczuk Edyta, Kalinowska-Wichrowska Katarzyna, Bołtryk Michał, Jiménez José Ramón, Fernández José María
Faculty of Civil and Environmental Engineering, Bialystok University of Technology, 15-351 Białystok, Poland.
School of Engineering Sciences of Belmez, University of Córdoba, 14240 Belmez, Spain.
Materials (Basel). 2019 Jan 24;12(3):367. doi: 10.3390/ma12030367.
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.
混凝土是一种长期以来常用的建筑材料。因此，在建筑结构的修复或拆除过程中，会产生大量混凝土碎块，这就需要进行适当的管理。已开展的研究旨在确定混凝土碎块的热处理和机械处理对再生骨料混凝土性能的影响。该研究实验包括12个系列，有三个变量：X₁——焙烧温度（300、600、900℃），X₂——机械处理时间（5、10、15分钟），X₃——粗再生骨料含量（体积比20%、40%、60%）。还制备了另外两个系列，分别包含未经处理的再生骨料和天然骨料。对各个骨料所确定的性能证实了热机械处理的积极效果。然后，根据抗压强度、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，确定了混凝土热处理和机械处理的最有利参数。试验结果表明，对混凝土碎块进行适当处理能够获得高质量的粗骨料和有价值的细颗粒部分。对骨料和分离出的水泥浆体进行的宏观和微观观察也证实了这一点。关于混凝土回收方法所开展的工作获得了专利PAT.229887。
