Lv Leyang, Schlangen Erik, Xing Feng
Micromechanics Laboratory (MICROLAB), Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands.
Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, School of Civil Engineering, Shenzhen University, Shenzhen 518060, China.
Materials (Basel). 2017 Aug 22;10(8):979. doi: 10.3390/ma10080979.
Water ingress into cracked concrete structures is a serious problem, as it can cause leakage and reinforcement corrosion and thus reduce functionality and safety of the structures. In this study, the application of water-swelling rubber particles for providing the cracked concrete a self-sealing function was developed. The feasibility of applying water-swelling rubber particles and the influence of incorporating water-swelling rubber particles on the mechanical properties of concrete was investigated. The self-sealing efficiency of water-swelling rubber particles with different content and particle size was quantified through a permeability test. The sealing effect of the water swelling rubber particles was monitored by X-ray computed tomography. The experimental results show that, by using 6% of these water swelling rubber particles as a replacement of aggregates in concrete, up to 64% and 61% decrease of water permeability was realized for 0.7 mm and 1.0 mm cracks. Furthermore, when the concrete cracks, the water swelling rubber particles can act as a crack bridging filler, preventing the crack from fully separating the specimens in two pieces.
水分侵入开裂的混凝土结构是一个严重的问题，因为它会导致渗漏和钢筋腐蚀，从而降低结构的功能性和安全性。在本研究中，开发了应用吸水膨胀橡胶颗粒为开裂混凝土提供自密封功能的方法。研究了应用吸水膨胀橡胶颗粒的可行性以及掺入吸水膨胀橡胶颗粒对混凝土力学性能的影响。通过渗透试验对不同含量和粒径的吸水膨胀橡胶颗粒的自密封效率进行了量化。利用X射线计算机断层扫描监测吸水膨胀橡胶颗粒的密封效果。实验结果表明，在混凝土中使用6%的这些吸水膨胀橡胶颗粒替代骨料时，对于0.7毫米和1.0毫米的裂缝，透水性分别降低了64%和61%。此外，当混凝土开裂时，吸水膨胀橡胶颗粒可以作为裂缝桥接填料，防止裂缝将试件完全分成两块。
