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基于“内置”碳化的自修复砂浆的制备与表征

Preparation and Characterization of Self-Healing Mortar Based on "Build-In" Carbonation.

作者信息

Wang Xin, Li Wenting, Jiang Zhengwu

机构信息

Key Laboratory of Advanced Civil Engineering Materials Ministry of Education, Tongji University, Shanghai 200092, China.

出版信息

Materials (Basel). 2020 Feb 1;13(3):644. doi: 10.3390/ma13030644.

DOI:10.3390/ma13030644
PMID:32024077
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7041377/
Abstract

In this study, a new type of cement-based healing pellets (CHPs) were proposed to accelerate the healing efficiency of concrete, which was mainly based on the introduced NaCO on promoting the formation of calcium carbonate (CaCO) in cracks. The effects of NaCO on the characteristics of CHPs were firstly investigated, and then the properties of cement mortar mixed with CHPs were studied quantitatively, including the workability, mechanical properties and healing ability. The results showed that higher dosages of NaCO in CHPs decreased the size range of pellets and reduced the setting time, fluidity and heat of hydration of mortar. Still more, CHPs reduced the early strength of mortar but kept the intensity growth rate stable such that it had nearly no negative effect on the later strength. With the content of CHPs increasing, the strength of mortar showed a decreasing trend, while the pore-filling efficiency and strength healing rate of mortar were further improved. In addition, as a new type of self-healing pellets for concrete based on the "build-in" carbonation, CHPs improved the strength and healing effectiveness of cement mortar. When the dosage of NaCO in CHPs and the content of CHPs in mortar were at 10% and 25%, respectively, mortar obtained highest strength in the later stage and the best healing effect.

摘要

在本研究中，提出了一种新型的水泥基愈合微丸（CHPs）以提高混凝土的愈合效率，其主要基于引入的碳酸钠促进裂缝中碳酸钙（CaCO₃）的形成。首先研究了碳酸钠对CHPs特性的影响，然后定量研究了掺加CHPs的水泥砂浆的性能，包括工作性、力学性能和愈合能力。结果表明，CHPs中较高剂量的碳酸钠减小了微丸的尺寸范围，并缩短了凝结时间、降低了砂浆的流动性和水化热。此外，CHPs降低了砂浆的早期强度，但保持强度增长率稳定，因此对后期强度几乎没有负面影响。随着CHPs含量的增加，砂浆强度呈下降趋势，而砂浆的孔隙填充效率和强度愈合率进一步提高。此外，作为一种基于“内置”碳酸化的新型混凝土自愈合微丸，CHPs提高了水泥砂浆的强度和愈合效果。当CHPs中碳酸钠的用量和砂浆中CHPs的含量分别为10%和25%时，砂浆在后期获得最高强度和最佳愈合效果。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d23f/7041377/21753122c745/materials-13-00644-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d23f/7041377/183fe754c403/materials-13-00644-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d23f/7041377/68a34be7548e/materials-13-00644-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d23f/7041377/eca3810244a1/materials-13-00644-g017.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d23f/7041377/cd2acc61c3a4/materials-13-00644-g018.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d23f/7041377/ebd577aef292/materials-13-00644-g019.jpg
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Effect of Addition of Ca and CO Ions with Temperature Control on Self-Healing of Hardened Cement Paste.添加钙和碳酸根离子并控制温度对硬化水泥浆体自愈合的影响。
Materials (Basel). 2019 Aug 1;12(15):2456. doi: 10.3390/ma12152456.
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The Effect of the Morphology of Coarse Aggregate on the Properties of Self-Compacting High-Performance Fibre-Reinforced Concrete.粗集料形态对自密实高性能纤维增强混凝土性能的影响
Materials (Basel). 2018 Aug 7;11(8):1372. doi: 10.3390/ma11081372.
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Recent Advances in Intrinsic Self-Healing Cementitious Materials.
新型自修复水泥基材料的研究进展。
Adv Mater. 2018 Apr;30(17):e1705679. doi: 10.1002/adma.201705679. Epub 2018 Mar 25.
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Self-Healing in Cementitious Materials-A Review.水泥基材料中的自愈性——综述
Materials (Basel). 2013 May 27;6(6):2182-2217. doi: 10.3390/ma6062182.
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Preparation and Properties of Melamine Urea-Formaldehyde Microcapsules for Self-Healing of Cementitious Materials.用于胶凝材料自修复的三聚氰胺脲醛微胶囊的制备与性能
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