Executive
Executive
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管理人员
DOI：
10.1080/03147539408712943
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
R. Vp
中科院分区：
文献类型：
--
作者：
P. Bull;C. M. Philip M. Purcell;Renee V. Kurdzos;P. Vp;E. Vp;IV Planning;R. Vp;F. Vp;R. Vp
自愈合工程水泥基复合材料（ECC）在发生开裂时具有比普通混凝土更高的耐久性和结构能力，并降低了维修成本。喷涂这种材料的可能性意味着更容易维修，特别是在传统浇注被认为很困难的情况下。因此，本研究的目的是开发可喷涂的自愈ECC混合物。两种矿物掺合料被用作混合料中的自愈合剂：氧化镁（MgO）和结晶掺合料（CA）。将从喷涂板获得的试样预裂，在水下固化以加速愈合过程，并使用便携式显微镜随时间监测以研究裂缝的填充。进行了几项测试，以评估自愈合后材料的性能（例如，快速氯化物迁移测试和透水性）。研究期间确定的挑战之一是保持所有样本的预开裂常数，以避免在分析中增加额外的变量。获得具有ECC中常见的高含量PVA纤维的可喷涂混合物也是一项困难的任务。得出的结论是，与喷涂相容的混合物中的最大PVA纤维含量为1.8%。研究结果表明，MgO和CA导致的自愈合行为所证明的裂缝宽度的减少和几种测试方法的结果。
Self-healing engineered cementitious composites (ECC) present enhanced durability and structural ability in the event of cracking that a plain concrete and reduces repair costs. The possibility of spraying this material means greater ease in repairs, especially in situations where traditional pours would deem difficult. Hence, the aim of this research was to develop sprayable self-healing ECC mixes. Two mineral admixtures were used as self-healing agents in the mixes: magnesium oxide (MgO) and crystalline admixtures (CA). The specimens obtained from sprayed panels were pre-cracked, cured under water to accelerate the healing process and monitored over time using a portable microscope to study the filling of the cracks. Several tests were performed to assess the properties of the material after the self-healing (e.g. rapid chloride migration test and water permeability). One of the challenges identified during the study was maintaining the pre-cracking constant in all specimens to avoid adding an additional variable to the analysis. Obtaining sprayable mixes with the high content of PVA fibres commonly found in ECC was also a difficult task. It was concluded that the maximum PVA fibre content in the mixes that was compatible with spraying was 1.8%. The findings indicate that both MgO and CA led to self-healing behaviour as evidenced by the reduction of the crack widths and the results of several testing methods.