Cargando…

Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack

Concrete wastewater infrastructures are important to modern society but are susceptible to sulfuric acid attack when exposed to an aggressive environment. Fibre-reinforced mortar has been adopted as a promising coating and lining material for degraded reinforced concrete structures due to its unique...

Descripción completa

Detalles Bibliográficos
Autores principales: Fan, Wei, Zhuge, Yan, Ma, Xing, Chow, Christopher W. K., Gorjian, Nima, Oh, Jeong-A, Duan, Weiwei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7503559/
https://www.ncbi.nlm.nih.gov/pubmed/32872478
http://dx.doi.org/10.3390/ma13173822
_version_ 1783584421997182976
author Fan, Wei
Zhuge, Yan
Ma, Xing
Chow, Christopher W. K.
Gorjian, Nima
Oh, Jeong-A
Duan, Weiwei
author_facet Fan, Wei
Zhuge, Yan
Ma, Xing
Chow, Christopher W. K.
Gorjian, Nima
Oh, Jeong-A
Duan, Weiwei
author_sort Fan, Wei
collection PubMed
description Concrete wastewater infrastructures are important to modern society but are susceptible to sulfuric acid attack when exposed to an aggressive environment. Fibre-reinforced mortar has been adopted as a promising coating and lining material for degraded reinforced concrete structures due to its unique crack control and excellent anti-corrosion ability. This paper aims to evaluate the performance of polyethylene (PE) fibre-reinforced calcium aluminate cement (CAC)–ground granulated blast furnace slag (GGBFS) blended strain-hardening mortar after sulfuric acid immersion, which represented the aggressive sewer environment. Specimens were exposed to 3% sulfuric acid solution for up to 112 days. Visual, physical and mechanical performance such as water absorption ability, sorptivity, compressive and direct tensile strength were evaluated before and after sulfuric acid attack. In addition, micro-structure changes to the samples after sulfuric acid attack were also assessed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to further understand the deterioration mechanism. The results show that overall fibre-reinforced calcium aluminate cement (CAC)-based samples performed significantly better than fibre-reinforced ordinary Portland cement (OPC)-based samples as well as mortar samples in sulfuric acid solution in regard to visual observations, penetration depth, direct tensile strength and compressive reduction. Gypsum generation in the cementitious matrix of both CAC and OPC-based systems was the main reason behind the deterioration mechanism after acid attack exposure. Moreover, laboratory sulfuric acid testing has been proven for successfully screening the cementitious material against an acidic environment. This method can be considered to design the service life of concrete wastewater pipes.
format Online
Article
Text
id pubmed-7503559
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-75035592020-09-23 Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack Fan, Wei Zhuge, Yan Ma, Xing Chow, Christopher W. K. Gorjian, Nima Oh, Jeong-A Duan, Weiwei Materials (Basel) Article Concrete wastewater infrastructures are important to modern society but are susceptible to sulfuric acid attack when exposed to an aggressive environment. Fibre-reinforced mortar has been adopted as a promising coating and lining material for degraded reinforced concrete structures due to its unique crack control and excellent anti-corrosion ability. This paper aims to evaluate the performance of polyethylene (PE) fibre-reinforced calcium aluminate cement (CAC)–ground granulated blast furnace slag (GGBFS) blended strain-hardening mortar after sulfuric acid immersion, which represented the aggressive sewer environment. Specimens were exposed to 3% sulfuric acid solution for up to 112 days. Visual, physical and mechanical performance such as water absorption ability, sorptivity, compressive and direct tensile strength were evaluated before and after sulfuric acid attack. In addition, micro-structure changes to the samples after sulfuric acid attack were also assessed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to further understand the deterioration mechanism. The results show that overall fibre-reinforced calcium aluminate cement (CAC)-based samples performed significantly better than fibre-reinforced ordinary Portland cement (OPC)-based samples as well as mortar samples in sulfuric acid solution in regard to visual observations, penetration depth, direct tensile strength and compressive reduction. Gypsum generation in the cementitious matrix of both CAC and OPC-based systems was the main reason behind the deterioration mechanism after acid attack exposure. Moreover, laboratory sulfuric acid testing has been proven for successfully screening the cementitious material against an acidic environment. This method can be considered to design the service life of concrete wastewater pipes. MDPI 2020-08-29 /pmc/articles/PMC7503559/ /pubmed/32872478 http://dx.doi.org/10.3390/ma13173822 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fan, Wei
Zhuge, Yan
Ma, Xing
Chow, Christopher W. K.
Gorjian, Nima
Oh, Jeong-A
Duan, Weiwei
Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack
title Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack
title_full Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack
title_fullStr Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack
title_full_unstemmed Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack
title_short Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack
title_sort durability of fibre-reinforced calcium aluminate cement (cac)–ground granulated blast furnace slag (ggbfs) blended mortar after sulfuric acid attack
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7503559/
https://www.ncbi.nlm.nih.gov/pubmed/32872478
http://dx.doi.org/10.3390/ma13173822
work_keys_str_mv AT fanwei durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack
AT zhugeyan durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack
AT maxing durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack
AT chowchristopherwk durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack
AT gorjiannima durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack
AT ohjeonga durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack
AT duanweiwei durabilityoffibrereinforcedcalciumaluminatecementcacgroundgranulatedblastfurnaceslagggbfsblendedmortaraftersulfuricacidattack