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Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

In this work, two series of chemically reactive polymers, silane coupling agents (SCAs) and water-soluble polymers, were specifically designed as an additive to improve the ductility of slag geopolymer paste by vibration pressure technique. The influences of organic polymers on the fluidity, rheolog...

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Autores principales: Xing, Xiaotong, Wei, Jiangxiong, Xu, Weiting, Wang, Beihan, Luo, Shunjie, Yu, Qijun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9573140/
https://www.ncbi.nlm.nih.gov/pubmed/36236162
http://dx.doi.org/10.3390/polym14194214
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author Xing, Xiaotong
Wei, Jiangxiong
Xu, Weiting
Wang, Beihan
Luo, Shunjie
Yu, Qijun
author_facet Xing, Xiaotong
Wei, Jiangxiong
Xu, Weiting
Wang, Beihan
Luo, Shunjie
Yu, Qijun
author_sort Xing, Xiaotong
collection PubMed
description In this work, two series of chemically reactive polymers, silane coupling agents (SCAs) and water-soluble polymers, were specifically designed as an additive to improve the ductility of slag geopolymer paste by vibration pressure technique. The influences of organic polymers on the fluidity, rheological behavior, mechanical property, porosity, and toughening mechanism of slag geopolymer were investigated. The polycondensation and bonding characteristics of organic–inorganic products were calculated by (1)H liquid nuclear magnetic resonance (NMR) technology and Fourier transform infrared (FT-IR). The polymerization degree of composite geopolymer was evaluated by (29)Si NMR and X-ray photoelectron spectroscopy (XPS). The microscopic morphology of the geopolymer matrix was analyzed using scanning electron microscopy (SEM). The results showed that the dosage of the KH570 and PAA-Na with 5 wt% behaved best in improving the flexural strength and the compressive strength of geopolymer in their corresponding organic series, respectively. The addition of polymers decreased the fluidity and the fluidity loss ratio of geopolymer slurry but reduced the harmful pores of hardened geopolymer. The organic polymers acting as bridge-fixed water molecules weakened the repulsion force, and formed a three-dimensional network through molecular interweaving in a geopolymer matrix. Methacryloxy in silane coupling agents and carboxyl group in water-soluble polymers may contribute to the improvement of hydration product structure through strong bonding with C-A-S-H. Microscopic measurements indicated that the addition of KH570 and PAA-Na in geopolymer could form 73.55% and 72.48% Si-O-Si with C-A-S-H gel, higher than the reference, and increase the polycondensation degree of C-A-S-H phase, reflected by the increased generation of Q(2) and Q(2)(1Al) and the longer chain length, leading to a higher densified geopolymer matrix with high ductility.
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spelling pubmed-95731402022-10-17 Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix Xing, Xiaotong Wei, Jiangxiong Xu, Weiting Wang, Beihan Luo, Shunjie Yu, Qijun Polymers (Basel) Article In this work, two series of chemically reactive polymers, silane coupling agents (SCAs) and water-soluble polymers, were specifically designed as an additive to improve the ductility of slag geopolymer paste by vibration pressure technique. The influences of organic polymers on the fluidity, rheological behavior, mechanical property, porosity, and toughening mechanism of slag geopolymer were investigated. The polycondensation and bonding characteristics of organic–inorganic products were calculated by (1)H liquid nuclear magnetic resonance (NMR) technology and Fourier transform infrared (FT-IR). The polymerization degree of composite geopolymer was evaluated by (29)Si NMR and X-ray photoelectron spectroscopy (XPS). The microscopic morphology of the geopolymer matrix was analyzed using scanning electron microscopy (SEM). The results showed that the dosage of the KH570 and PAA-Na with 5 wt% behaved best in improving the flexural strength and the compressive strength of geopolymer in their corresponding organic series, respectively. The addition of polymers decreased the fluidity and the fluidity loss ratio of geopolymer slurry but reduced the harmful pores of hardened geopolymer. The organic polymers acting as bridge-fixed water molecules weakened the repulsion force, and formed a three-dimensional network through molecular interweaving in a geopolymer matrix. Methacryloxy in silane coupling agents and carboxyl group in water-soluble polymers may contribute to the improvement of hydration product structure through strong bonding with C-A-S-H. Microscopic measurements indicated that the addition of KH570 and PAA-Na in geopolymer could form 73.55% and 72.48% Si-O-Si with C-A-S-H gel, higher than the reference, and increase the polycondensation degree of C-A-S-H phase, reflected by the increased generation of Q(2) and Q(2)(1Al) and the longer chain length, leading to a higher densified geopolymer matrix with high ductility. MDPI 2022-10-08 /pmc/articles/PMC9573140/ /pubmed/36236162 http://dx.doi.org/10.3390/polym14194214 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xing, Xiaotong
Wei, Jiangxiong
Xu, Weiting
Wang, Beihan
Luo, Shunjie
Yu, Qijun
Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix
title Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix
title_full Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix
title_fullStr Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix
title_full_unstemmed Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix
title_short Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix
title_sort effect of organic polymers on mechanical property and toughening mechanism of slag geopolymer matrix
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9573140/
https://www.ncbi.nlm.nih.gov/pubmed/36236162
http://dx.doi.org/10.3390/polym14194214
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