Strength and chloride ion distribution brought by aggregate of basalt fiber reinforced coral aggregate concrete
Strength and chloride ion distribution brought by aggregate of basalt fiber reinforced coral aggregate concrete
复制标题
玄武岩纤维珊瑚骨料混凝土骨料带来的强度及氯离子分布
DOI：
10.1016/j.conbuildmat.2019.117390
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发表时间：
2020-02-20
影响因子：
7.4
通讯作者：
Luo, Daming
中科院分区：
文献类型：
--
作者：
Wang, Yan;Zhang, Shaohui;Luo, Daming
珊瑚骨料混凝土强度低和氯离子侵蚀限制了其在远离大陆的海岛地区的应用。研究了不同玄武岩纤维（BF）掺量对BF增强CAC（BFRCAC）中珊瑚骨料Cl-分布、劈拉强度和抗压强度的影响。CAC样品被制造为掺入四个体积分数的BF（0.05，0.1。0.15、0.2vol %）和不加BF作为对照组。采用热重法计算了BFRCAC的理论孔容，并采用X射线粉末衍射法分析了BFRCAC的水化产物。此外，利用扫描电子显微镜（SEM）分析了表面形貌和BF在CAC中的作用。结果表明，BF的掺入提高了CAC的抗压强度和劈裂抗拉强度，且加入量为1.5vol%和2.0vol%时效果较好。0.05%BF的加入加速了氯离子从珊瑚聚集体中的渗出。而BF用量在0.05%以上时，可抑制氯离子的渗出。XRD和TG分析结果表明，氯离子以Friedel盐的形式存在于珊瑚骨水泥中。扫描电镜可以观察到BF与CAC紧密结合，微裂纹被BF控制，这有助于减少氯离子在骨料中的渗出。(C)2019爱思唯尔有限公司版权所有。
Low strength of concrete and chloride attack introduced by coral aggregate limit the application of coral aggregate concrete (CAC) on the island far from the mainland. This investigation explores the effects of different amounts of basalt fiber (BF) on the Cl- distribution brought by coral aggregates, splitting tensile strength, and compressive strength in BF-reinforced CAC (BFRCAC). The CAC samples were fabricated incorporating four volume fractions of BF (0.05, 0.1. 0.15, and 0.2 vol%) and without BF which used as the contrast group. The theoretical total pore volume of BFRCAC was calculated on the basis of thermo-gravimetric (TG) and the hydration products of BFRCAC was analyzed by X-ray powder diffraction (XRD). Furthermore, the surface topography and role of BF in CAC was analyzed using scanning electron microscopy (SEM). The results indicated the compressive strength and splitting tensile strength of CAC were enhanced by incorporating BF, and the addition of 1.5 vol% or 2.0 vol% BF has a better impact. The inclusion of 0.05% BF accelerates the exudation of chloride ions from the coral aggregate. In contrast, a dosage of BF above 0.05% can suppress the exudation of chloride ions. The results of XRD and TG demonstrated the Cl- in CAC from coral aggregate combined in the shape of Friedel's salt. SEM can observe the BF tightly bonded to the CAC and the microcracks were controlled by BF, which is contribute to reduce the exudation of chloride ions in the aggregate. (C) 2019 Elsevier Ltd. All rights reserved.