混杂纤维混凝土的耐硫酸盐腐蚀性能研究

发布时间：2018-08-16 07:35

【摘要】：为了研究混杂纤维混凝土抗硫酸盐腐蚀性能,对聚乙烯纤维(PE)与聚丙烯粗合成纤维(HPP)混凝土进行硫酸盐干湿循环腐蚀和长期浸泡侵蚀试验,采用形貌损伤、质量损失、相对动弹性模量和抗压强度等宏观测试方法研究了混杂纤维混凝土耐硫酸盐腐蚀性能,并结合SEM微观结构测试技术分析了其腐蚀机理。结果表明:不同纤维掺量的混凝土在硫酸盐腐蚀作用下均出现了不同程度的损伤,其干湿循环的腐蚀作用较长期浸泡腐蚀混凝土的腐蚀损伤更为明显;长期浸泡腐蚀作用时,450 d素混凝土抗压强度可达到60 MPa,各纤维混凝土抗压强度均可达到70 MPa,但在干湿循环腐蚀作用下,聚乙烯纤维和聚丙烯粗合成纤维以0.8%+1.2%掺入时,混凝土抗压强度也可达到70 MPa;纤维对于混凝土内部结构应力的缓解,孔隙、通道等缺陷的分散以及纤维之间的捆绑桥联都显著的提高了混凝土抗硫酸盐腐蚀性。
[Abstract]:In order to study the sulfate corrosion resistance of hybrid fiber concrete, the sulfate dry-wet cyclic corrosion and long-term immersion corrosion tests of polyethylene fiber (PE) and polypropylene crude synthetic fiber (HPP) concrete were carried out. The macroscopic test methods such as morphological damage, mass loss, relative dynamic elastic modulus and compressive strength were used to study the coagulation behavior of hybrid fiber concrete. The results show that concrete with different fiber content has different degree of damage under the action of sulfate corrosion, and the corrosion effect of dry-wet cycle is more obvious than that of concrete with long-term immersion corrosion. The compressive strength of 450 D plain concrete can reach 60 MPa, and the compressive strength of each fiber concrete can reach 70 MPa. However, the compressive strength of concrete can reach 70 MPa when polyethylene fiber and polypropylene crude synthetic fiber are mixed with 0.8% and 1.2% under the action of dry-wet cyclic corrosion. Dispersion of defects such as channels and bundled bridges between fibers can significantly improve the sulfate corrosion resistance of concrete.
【作者单位】：长安大学材料科学与工程学院;长安大学交通铺面材料教育部工程研究中心;陕西省交通规划设计研究院;
【基金】：国家自然科学基金(51508030) 青海省重大科技专项计划项目(2014-GX-A2A) 长安大学中央高校基本科研业务费专项资金资助(310831162001,310831161001)
【分类号】：TU528

【相似文献】