de Mendonça Filho Fernando França, Romero Rodriguez Cláudia, Schlangen Erik, Çopuroğlu Oğuzhan
Materials & Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands.
Materials (Basel). 2022 May 12;15(10):3490. doi: 10.3390/ma15103490.
Concrete structures perform poorly when withstanding thermal shock events, usually requiring repair or replacement after one single instance. In certain industries (such as petrol, metallurgic and ceramics), these events are not only likely but frequent, which represents a considerable financial burden. One option to solve this issue would be to decrease the heating rate imposed onto the concrete material through the use of a protective surface layer. In this work, the suitability of dunite and microgabbro as protective materials is explored through X-ray diffraction, thermal dilation, optical microscopy, X-ray microtomography, thermo-gravimetric analysis and a compressive test. Further, the thermal dilation was used as an input to simulate a composite concrete-rock wall and the respective stresses caused by a thermal shock event. The dehydration of chrysotile in dunite and the decomposition of analcime, chamosite and pumpellyite in microgabbro were both favourable for the performance of the stones in the desired application. The thermal stability and deformation were found in the range of what can be applied directly on concrete; however, it was clear that pre-heating treatment results in a far more durable system in a cyclic thermal load situation.
混凝土结构在承受热冲击事件时表现不佳，通常在经历一次热冲击后就需要修复或更换。在某些行业（如石油、冶金和陶瓷），这些热冲击事件不仅可能发生，而且很频繁，这带来了相当大的经济负担。解决这个问题的一个办法是通过使用保护表层来降低施加在混凝土材料上的加热速率。在这项工作中，通过X射线衍射、热膨胀、光学显微镜、X射线显微断层扫描、热重分析和抗压试验，探讨了纯橄榄岩和微辉长岩作为保护材料的适用性。此外，热膨胀被用作输入参数来模拟复合混凝土-岩石墙以及热冲击事件引起的相应应力。纯橄榄岩中温石棉的脱水以及微辉长岩中方沸石、鲕绿泥石和斜帘石的分解，都有利于这些石材在预期应用中的性能表现。发现其热稳定性和变形在可直接应用于混凝土的范围内；然而，很明显，在循环热负荷情况下，预热处理会使系统更加耐用。
