Tanyıldızı Muhammed, Yücel Hasan Erhan, Dutkiewicz Maciej, Çoban Hakan, Bakış Abdulrezzak
Department of Civil Engineering, Faculty of Engineering and Architecture, Bitlis Eren University, 13100, Bitlis, Turkey.
Civil Engineering Department, Engineering Faculty, Niğde Ömer Halisdemir University, 51240, Niğde, Turkey.
Sci Rep. 2024 Nov 30;14(1):29788. doi: 10.1038/s41598-024-81550-4.
The research presented here investigates the usability of trachydacitic, an unexploited material that occurred in nature, as aggregate in the construction of concrete/rigid pavements under two different curing conditions. These curing conditions are specified as 28 days 20 ± 5 ˚C water curing and combined curing including 3 days 20 ± 5 ˚C water curing + 2 days dry oven curing at 200 ± 5 ˚C. Four different combinations of trachydacitic aggregated concrete as conventional concrete (CC) and high strength concrete (HSC), with steel fiber and fiberless, were produced at different cement and water contents. Mechanical (compressive and flexural strength), durability (freeze-thaw and sorptivity) and surface abrasion properties of studied concretes were tested for each curing condition. Additionally, SEM-EDX and XRD analyses were conducted to investigate the microstructural, elemental and mineralogical changes with curing. According to the test results, the highest compressive and flexural strength were obtained from the DLPB (Trachydacitic aggregated fibrous HSC) as 75,09 MPa and 10,09 MPa respectively after the combined curing process. Moreover, the combined curing process increased the resistance of concrete to freeze-thaw and water sorptivity, while reducing its resistance to Böhme abrasion. Microstructural investigations also revealed that HSCs have a denser structure compared to conventional concretes. As a result, it was determined that the powder form of trachydacitic aggregate, unlike its coarse form, can be used in HSC road pavement construction.
本文所呈现的研究探讨了粗面安山岩这种未被开发利用的天然材料，在两种不同养护条件下作为混凝土/刚性路面骨料的适用性。这些养护条件具体规定为28天20±5℃水养护以及包括3天20±5℃水养护 + 2天200±5℃干烤箱养护的组合养护。以不同的水泥和水含量制备了四种不同组合的粗面安山岩骨料混凝土，分别为常规混凝土（CC）和高强度混凝土（HSC），有钢纤维和无纤维的情况。针对每种养护条件，测试了所研究混凝土的力学性能（抗压强度和抗弯强度）、耐久性（冻融性和吸水性）以及表面耐磨性。此外，进行了扫描电子显微镜 - 能谱仪（SEM - EDX）和X射线衍射（XRD）分析，以研究养护过程中的微观结构、元素和矿物学变化。根据测试结果，在组合养护过程后，从DLPB（粗面安山岩骨料纤维增强HSC）获得了最高的抗压强度和抗弯强度，分别为75.09 MPa和10.09 MPa。此外，组合养护过程提高了混凝土的抗冻融性和吸水性，同时降低了其对Böhme磨损的抗性。微观结构研究还表明，与常规混凝土相比，HSC具有更致密的结构。结果确定，粗面安山岩骨料的粉末形式与粗颗粒形式不同，可用于HSC道路路面施工。
