Influence of triethanolamine on reactivity of hydrated matrix in sodium silicate self-healing system and the mechanism

•TEA was incorporated to increase the reactivity of hydrated cement.•The self-healing efficiency of sodium silicate system was improved by the complex between TEA and Ca2+.•TEA enhanced the micromechanical properties of self-healing product. A suitable binding agent proposed in literatures or patent...

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Veröffentlicht in:Construction & building materials 2018-10, Vol.185, p.445-452
Hauptverfasser: Hu, Miaomiao, Guo, Jintang, Xu, Yang, Fan, Jinjie, Cao, Lei, Wang, Meiyu, Feng, Yakai
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container_end_page 452
container_issue
container_start_page 445
container_title Construction & building materials
container_volume 185
creator Hu, Miaomiao
Guo, Jintang
Xu, Yang
Fan, Jinjie
Cao, Lei
Wang, Meiyu
Feng, Yakai
description •TEA was incorporated to increase the reactivity of hydrated cement.•The self-healing efficiency of sodium silicate system was improved by the complex between TEA and Ca2+.•TEA enhanced the micromechanical properties of self-healing product. A suitable binding agent proposed in literatures or patents is sodium silicate, which achieves self-healing by formation of calcium silicate hydrate (C-S-H) in cracks. We systematically investigated the influences of triethanolamine (TEA) on the stimulated C-S-H, sodium silicate/hydrated cement and real self-healing system. Results suggest that TEA addition induces the C-S-H to arrange in order and forms sponge-like structure. In sodium silicate/hydrated cement sample, the morphology of C-S-H is simultaneously affected by the heterogeneous nucleation and restriction effect of hydrated cement particles, and the reticulate structure is observed. It is believed that the formation of TEA-Ca2+ facilitated the dissolution of solid Ca from hydration products, hence increases the chemical reactivity of hydrated cement matrix and the actual binding ability is improved due to the increment of high density C-S-H. Finally, the improved performance of self-healed area was demonstrated by optical microscope, SEM and Raman analysis, meanwhile the promotion in micromechanical properties of C-S-H was studied by AFM.
doi_str_mv 10.1016/j.conbuildmat.2018.07.040
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source Elsevier ScienceDirect Journals
subjects Analysis
Building materials durability
Calcium silicate hydrate (C-S-H)
Cement matrix
Cements (Building materials)
Chemical properties
Complexation
Mechanical properties
Self-healing
Triethanolamine
title Influence of triethanolamine on reactivity of hydrated matrix in sodium silicate self-healing system and the mechanism
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