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结晶外加剂和高吸水性聚合物对砂浆自愈合及力学性能的影响

Effect of Crystalline Admixture and Superabsorbent Polymer on Self-Healing and Mechanical Properties of Mortar.

作者信息

Wu Hexiang, Chen Xi, Liu Yao, Li Shuangxin, Li Hongfeng

机构信息

School of Civil Engineering, Northeast Forestry University, Harbin 150040, China.

出版信息

Materials (Basel). 2022 Sep 1;15(17):6040. doi: 10.3390/ma15176040.

DOI:10.3390/ma15176040
PMID:36079425
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9456772/
Abstract

In this study, the self-healing properties of mortars mixed with a crystalline admixture (CA) and superabsorbent polymer (SAP) were investigated. By conducting uniaxial compressive strength tests on the mortar samples, the effects of the two admixtures and different admixture ratios on the initial compressive strength and strength repair ability at different curing ages of the mortar after pre-cracking were investigated. To verify the results, optical microscopy, scanning electron microscopy, and X-ray diffraction were used for microscopic observation of the cracks and their healing products. The results of this study show that CA, which generates dense substances through chemical reactions, has obvious advantages in the self-healing of microcracks and has a greater effect on the flexural strength of mortar compared with SAP, which can effectively fill wider cracks, reduce the width of cracks through physical expansion, and has a greater impact on the compressive strength of mortar compared with CA. Compared with ordinary mortar, mortar mixed with CA only, and mortar mixed with SAP only, the appropriate amounts of both CA and SAP can effectively combine the advantageous effects of CA and SAP and optimise the self-healing effect of mortar so that its self-healing rate reaches 103%. The self-healing filler, consisting mainly of calcium silicate and calcium carbonate, is generated in cracks and enhances the repair strength of the mortar so that the strength of the mortar reaches 46 MPa.

摘要

在本研究中，对掺有结晶型外加剂（CA）和高吸水性聚合物（SAP）的砂浆的自愈合性能进行了研究。通过对砂浆样品进行单轴抗压强度试验，研究了这两种外加剂及其不同掺量对砂浆预裂后不同养护龄期的初始抗压强度和强度修复能力的影响。为验证结果，采用光学显微镜、扫描电子显微镜和X射线衍射对裂缝及其愈合产物进行微观观察。本研究结果表明，通过化学反应生成致密物质的CA在微裂缝的自愈合方面具有明显优势，与能有效填充较宽裂缝、通过物理膨胀减小裂缝宽度的SAP相比，CA对砂浆抗折强度的影响更大；与普通砂浆、仅掺CA的砂浆和仅掺SAP的砂浆相比，适量的CA和SAP能有效结合两者的优势作用，优化砂浆的自愈合效果，使其自愈合率达到103%。裂缝中生成了主要由硅酸钙和碳酸钙组成的自愈合填充物，提高了砂浆的修复强度，使砂浆强度达到46MPa。

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