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

Autor: Nima Gorjian, Wei Fan, Christopher W.K. Chow, Weiwei Duan, Jeong-A Oh, Xing Ma, Yan Zhuge
Přispěvatelé: Fan, Wei, Zhuge, Yan, Ma, Xing, Chow, Christopher WK, Gorjian, Nima, Oh, Jeong-A, Duan, Weiwei
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Materials science
Aluminate
0211 other engineering and technologies
02 engineering and technology
lcsh:Technology
Article
law.invention
chemistry.chemical_compound
strain hardening behaviour
engineered cementitious composites (ECC)
law
021105 building & construction
Ultimate tensile strength
General Materials Science
lcsh:Microscopy
sulfuric acid attack
lcsh:QC120-168.85
Cement
lcsh:QH201-278.5
lcsh:T
calcium aluminate cement (CAC)
Metallurgy
Sulfuric acid
ground granulated blast furnace slag (GGBFS)
021001 nanoscience & nanotechnology
Portland cement
chemistry
lcsh:TA1-2040
Ground granulated blast-furnace slag
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
Cementitious
Mortar
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:TK1-9971
Zdroj: Materials
Materials, Vol 13, Iss 3822, p 3822 (2020)
Volume 13
Issue 17
ISSN: 1996-1944
Popis: 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)&ndash
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.
Databáze: OpenAIRE
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