Liang Jian, Zhu Han, Chen Lei, Han Xiaobin, Guo Qinglin, Gao Ying, Liu Chunsheng
School of Civil Engineering, Tianjin University, Tianjin 300072, China.
Anhui & Huaihe River Institute of Hydraulic Research, Hefei 230088, China.
Materials (Basel). 2019 Mar 14;12(6):862. doi: 10.3390/ma12060862.
Erosion effect of chloride ions from the marine, deicing salt, saline-alkali land and some industrial environments will cause the corrosion of rebar in concrete, which is one of the most harmful factors affecting the durability of concrete structure. It had been proved that the incorporation of rubber aggregates increase the capillary saturation of cement concrete and reduce the corrosion degree of rebar. This paper investigated the rebar corrosion behavior in rubber aggregate concrete under the chloride electro-accelerated corrosion condition and such an investigation has not been seen in any public literature. Two water-cement ratios (0.45 and 0.55) and four rubber contents (0, 50, 100, and 150 kg/m³) were selected for experiment. Four-point bending tests of concrete beam were conducted before and after chloride ion erosion in order to determine effect of rubber aggregate on the durability of rebar. Results showed that rebar corrosion degree decreased with the increase of rubber aggregate in concrete. Besides, the more the dosage of rubber is, the better the anti-crack performance of cement concrete. This will postpone the crack development and reduce the peak of rebar corrosion.
来自海洋、除冰盐、盐碱地和一些工业环境中的氯离子侵蚀作用，会导致混凝土中的钢筋腐蚀，这是影响混凝土结构耐久性的最有害因素之一。已有研究证明，掺入橡胶集料会增加水泥混凝土的毛细孔饱和度，并降低钢筋的腐蚀程度。本文研究了在氯离子电加速腐蚀条件下橡胶集料混凝土中钢筋的腐蚀行为，且此类研究在任何公开文献中均未见报道。试验选取了两个水灰比（0.45和0.55）以及四种橡胶掺量（0、50、100和150 kg/m³）。为了确定橡胶集料对钢筋耐久性的影响，在氯离子侵蚀前后对混凝土梁进行了四点弯曲试验。结果表明，随着混凝土中橡胶集料掺量的增加，钢筋腐蚀程度降低。此外，橡胶用量越多，水泥混凝土的抗裂性能越好。这将延缓裂缝发展并降低钢筋腐蚀峰值。
