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首页> 外文期刊>Construction and Building Materials >Damage layer thickness and formation mechanism of shotcrete with and without steel fiber under sulfate corrosion of dry-wet cycles by ultrasound plane testing method
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Damage layer thickness and formation mechanism of shotcrete with and without steel fiber under sulfate corrosion of dry-wet cycles by ultrasound plane testing method

机译：干湿循环硫酸盐腐蚀下有无钢纤维喷射混凝土损伤层厚度及形成机理的超声平面试验方法

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摘要

In recent years, nondestructive testing, especially ultrasound testing method, has been increasingly used to detect concrete strength, compactness, cracks, and other aspects. In this work, the damage layer, thickness measured by ultrasound plane testing method and the formation mechanism-of the damage layer were studied. Simultaneously, the damage process and microstructure of shotcrete under multiple coupling effects of sulfate attack and cyclic 'drying and wetting were also investigated. The results indicated that ultrasound plane testing accurately characterizes the damage layer thickness of shotcrete with and without steel fiber. The variation in performance of the original specimen was significant with increased thickness. An exponential distribution existed between the damage layer thickness and the original performances expected weight loss ratio. In the corrosion process, sulfate ions were transported into micropores and microcracks layer by layer, and velocity was slowly diffused from a distance from the surface. For ordinary shotcrete, sulfate attack is divided into three stages: ettringite action, combined ettringite and gypsum action, and gypsum action. However, for steel fiber-reinforced shotcrete, sulfate attack only occurred at the combined ettringite and gypsum action. (C) 2016 Elsevier Ltd. All rights reserved.
机译：近年来，无损检测，尤其是超声检测方法，已越来越多地用于检测混凝土的强度，密实度，裂缝和其他方面。在这项工作中，研究了损伤层，通过超声平面测试方法测量的厚度以及损伤层的形成机理。同时，还研究了硫酸盐侵蚀与循环“干湿”耦合作用下喷射混凝土的破坏过程和微观结构。结果表明，超声平面测试可以准确地表征有钢纤维和无钢纤维的喷射混凝土的损伤层厚度。原始样品的性能变化随厚度增加而显着。损伤层厚度与原始性能预期失重比之间存在指数分布。在腐蚀过程中，硫酸根离子被逐层输送到微孔和微裂纹中，并且速度从与表面的一定距离处缓慢扩散。对于普通的喷射混凝土，硫酸盐侵蚀分为三个阶段：钙矾石作用，钙矾石与石膏的结合作用以及石膏作用。但是，对于钢纤维增强喷射混凝土，硫酸盐侵蚀仅在钙矾石和石膏的共同作用下发生。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2016年第1期|346-356|共11页
  • 作者

    Wang Jiabin; Niu Ditao; Song Zhanping;

  • 作者单位

    Xian Univ Architecture & Technol, Coll Civil Engn, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Coll Civil Engn, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China|Xian Univ Architecture & Technol, Key Lab Struct Engn & Seism Resistance, Minist Educ, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Coll Civil Engn, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Damage layer thickness; Sulfate attack; Dry-wet cycle; Shotcrete; Steel fiber; Ultrasound plan testing method;

    机译：损伤层厚度;硫酸盐侵蚀;干湿循环;喷射混凝土;钢纤维;超声图测试方法;

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