ORCID Profile
0000-0002-9350-9564
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Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 02-2021
Publisher: Wiley
Date: 18-02-2013
Publisher: American Chemical Society (ACS)
Date: 22-07-2020
Publisher: MDPI AG
Date: 29-08-2020
DOI: 10.3390/MA13173822
Abstract: 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 s les 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 s les performed significantly better than fibre-reinforced ordinary Portland cement (OPC)-based s les as well as mortar s les 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.
Publisher: Elsevier BV
Date: 09-2020
No related grants have been discovered for Jeong-A Oh.