Kaplan Gokhan, Gulcan Aslinur, Cagdas Betul, Bayraktar Oguzhan Yavuz
Department of Civil Engineering, Faculty of Engineering, Atatürk University, Erzurum, Turkey.
Department of Civil Engineering, Faculty of Engineering and Architecture, Kastamonu University, Kastamonu, Turkey.
Environ Sci Pollut Res Int. 2021 Apr;28(14):17369-17394. doi: 10.1007/s11356-020-11881-y. Epub 2021 Jan 4.
Significant environmental damage can result from the use of natural resources such as cement, aggregate, and water in concrete production. Thus, more sustainable alternatives for concrete production are needed to protect the environment and natural resources. In this study, lightweight pervious concrete production involving recycled coarse aggregates (RCAs) with potential to cause environmental pollution was investigated. First, RCAs were produced from concretes possessing low compressive strength and were classified. Second, pervious concretes were produced from these RCAs. Third, the mechanical properties, permeability, and abrasion strength of the pervious concretes were determined. The water/cement (w/c) ratios of the mixtures were determined to be 0.32, 0.34, and 0.36, and the aggregate/cement (a/c) ratios were selected to be 3.5 and 4. Twelve different pervious concretes were produced and tested in total. The bulk densities (BD) of the mortars varied over an interval of 1160-1080 kg/m. The aim was to design pervious concretes with lightweight bulk densities. When the w/c ratio was 0.34, the compressive, splitting tensile and abrasion strengths were high. The compressive strength of the pervious concretes varied over an interval of 1.50-2.00 MPa. It was determined that for optimal permeability, the most appropriate w/c ratio was 0.36, and the best a/c ratio was 4. When the a/c ratio was 4, the strength values were high, and as a result, the mechanical properties were poor. With respect to aggregate gradation, it was determined that a grain size distribution of 9.50-12.50 mm was most suitable for this pervious concrete. Recycled aggregates with low strength produced low strength concrete. Therefore, the pervious concrete produced in this study is most suitable for pedestrian roads where heavy vehicle traffic does not exist.
混凝土生产中使用水泥、骨料和水等自然资源可能会造成重大环境破坏。因此，需要更具可持续性的混凝土生产替代方案来保护环境和自然资源。在本研究中，对涉及可能造成环境污染的再生粗骨料（RCA）的轻质透水混凝土生产进行了调查。首先，从抗压强度低的混凝土中生产出RCA并进行分类。其次，用这些RCA生产透水混凝土。第三，测定透水混凝土的力学性能、渗透性和耐磨强度。混合物的水灰比（w/c）确定为0.32、0.34和0.36，骨料与水泥比（a/c）选定为3.5和4。总共生产并测试了12种不同的透水混凝土。砂浆的堆积密度（BD）在1160 - 1080 kg/m的区间内变化。目标是设计具有轻质堆积密度的透水混凝土。当w/c比为0.34时，抗压、劈裂抗拉和耐磨强度较高。透水混凝土的抗压强度在1.50 - 2.00 MPa的区间内变化。确定对于最佳渗透性，最合适的w/c比为0.36，最佳a/c比为4。当a/c比为4时，强度值较高，结果力学性能较差。关于骨料级配，确定粒径分布为9.50 - 12.50 mm最适合这种透水混凝土。低强度的再生骨料生产出低强度的混凝土。因此，本研究中生产的透水混凝土最适合不存在重型车辆交通的人行道。
