纤维对混凝土耐久性的影响:实践综述
摘要
施的耐久性取决于其在环境暴露中保持可靠的可维护性和结构完整性的能力,这些环境暴露可能很苛刻,在整个设
计使用寿命期间不需要任何重大的维修干预。常规混凝土具有相对较低的拉伸能力和延展性,因此容易开裂。裂缝
被认为是气体,液体和有害溶质进入混凝土的途径,这导致混凝土或钢筋中恶化过程的早期开始。在沿海地区,裂
纹区域暴露于除冰盐或喷雾后,氯化物水溶液可能会迅速到达嵌入的钢中,从而使保护膜脱钝,因此腐蚀引发发生
的时间比氯化物在没有裂缝的情况下必须逐渐进入覆盖钢的未开裂混凝土时早几十年。钢或非金属纤维的适当加入
已被证明可以增加FRC的拉伸能力和延展性。许多研究人员已经研究了通过使用FRC来提高耐久性。本文综述了
FRC用于建设基础设施的拉伸特性的改善,主要通过纤维桥接和裂纹控制来提高其耐久性的大量证据。证据基于在
受控条件下报告的实验室调查和FRC实际基础设施的监测性能。本文旨在帮助设计工程师适当、更自信地考虑在现
实生活中的混凝土基础设施中使用FRC。
关键词
参考
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