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Effective Crack Control of Concrete by Self-Healing of Cementitious Composites Using Synthetic Fiber

机译:合成纤维水泥基复合材料自愈合有效裂缝控制

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摘要

Although concrete is one of the most widely used construction materials, it is characterized by substantially low tensile strength in comparison to its compression strength, and the occurrence of cracks is unavoidable. In addition, cracks progress due to environmental conditions including damage by freezing, neutralization, and salt, etc. Moreover, detrimental damage can occur in concrete structures due to the permeation of deteriorating elements such as Cl− and CO2. Meanwhile, under an environment in which moisture is being supplied and if the width of the crack is small, a phenomenon of self-healing, in which a portion of the crack is filled in due to the rehydration of the cement particles and precipitation of CaCO3, is been confirmed. In this study, cracks in cementitious composite materials are effectively dispersed using synthetic fibers, and for cracks with a width of more than 0.1 mm, a review of the optimal self-healing conditions is conducted along with the review of a diverse range of self-healing performance factors. As a result, it was confirmed that the effective restoration of watertightness through the production of the majority of self-healing products was achieved by CaCO3 and the use of synthetic fibers with polarity, along with the effect of inducing a multiple number of hairline cracks. In addition, it was confirmed that the self-healing conditions of saturated Ca(OH)2 solution, which supplied CO2 micro-bubbles, displayed the most effective self-healing performance in the surface and internal sections of the cracks.
机译:尽管混凝土是使用最广泛的建筑材料之一,但与抗压强度相比,其抗拉强度明显较低,不可避免地会出现裂缝。此外,由于环境条件(包括冻结,中和和盐分等造成的损坏)而导致裂纹发展。此外,由于劣化元素(例如Cl-和CO2)的渗透,混凝土结构中可能发生有害的损坏。同时,在提供水分的环境中,如果裂缝的宽度较小,则由于水泥颗粒的再水化和CaCO3的沉淀而产生的自修复现象,即裂缝的一部分被填充。 ,已被确认。在这项研究中,使用合成纤维有效地分散了水泥复合材料中的裂缝,对于宽度大于0.1 mm的裂缝,对最佳的自愈条件进行了审查,同时对各种范围的自修复进行了审查。愈合表现因素。结果,证实了通过CaCO 3和使用具有极性的合成纤维以及产生多条发际线裂缝的效果,通过生产大多数的自愈产品可有效地恢复水密性。此外,可以确定的是,提供了CO2微气泡的饱和Ca(OH)2溶液的自愈条件在裂纹的表面和内部均表现出最有效的自愈性能。

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