Comparative study of the mechanical and thermal properties of lightweight cementitious composites
Comparative study of the mechanical and thermal properties of lightweight cementitious composites
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DOI：
10.1016/j.conbuildmat.2017.10.102
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发表时间：
2018-01-20
影响因子：
7.4
通讯作者：
Hanna, Dominic
中科院分区：
文献类型：
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作者：
Brooks, Adam L.;Zhou, Hongyu;Hanna, Dominic
由于轻质混凝土和水泥基复合材料在降低结构荷载和建筑运行能耗方面具有优势性能，研究人员对其研究日益增多。在这项研究中，进行了全面而深入的研究，以探讨不同轻质填料对轻质水泥基复合材料（LWCCs）的力学性能和热性能的影响。研究了四种不同类型的轻质填料（LWFs），包括膨胀聚苯乙烯（EPS）珠粒、干膨胀热塑性微球（ETM）、空心玻璃微球（HGM）和粉煤灰漂珠（FACs），并结合了不同的粒径、壳壁厚度和比例。这些LWCCs在养护28天后对其力学性能和热物理性能都进行了测试。结果表明，LWCC的热性能主要由LWFs的体积分数决定，并且可以通过费尔斯克方程准确预测，而力学性能则受到所含LWF颗粒的类型和性能的严重影响。研究发现，大多数密度较高的粉煤灰漂珠（FAC）和空心玻璃微球（HGM）适合用于生产可用于结构应用的LWCC材料，而密度较低的HGM和具有软质聚合物外壳的LWFs则更适合用于非结构隔热部件。（C）2017爱思唯尔有限公司。保留所有权利。
Lightweight concrete and cementitious composites are increasingly studied by researchers due to their advantageous performance in reducing structural load and building's operational energy consumption. In this research, a comprehensive and thorough study was carried out to investigate the effects of different lightweight fillers on both the mechanical and thermal properties of lightweight cementitious composites, or LWCCs. Four different types of lightweight fillers (LWFs) including expanded polystyrene (EPS) beads, dry-expanded thermoplastic microspheres (ETM), hollow glass microspheres (HGM), and fly ash cenospheres (FACs) are studied in conjunction with various particle sizes, shell wall thickness, and proportions. Both mechanical and thermophysical properties were tested for these LWCCs after 28-day curing. The results indicated that the thermal property of LWCC is mostly governed by the volume fraction of LWFs and it can be accurately predicted by the Felske equation, whereas the mechanical properties are heavily affected by the type and property of LWF particles included. It was revealed that most fly ash cenospheres (FAC) and hollow glass microspheres (HGM) with higher density are suitable for producing LWCC materials that may be used for structural applications, whereas lower density HGMs and LWFs with soft polymer shell are more suitable for nonstructural thermal insulating components. (C) 2017 Elsevier Ltd. All rights reserved.