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Advances in Concrete Construction   Volume 6, Number 2, April 2018, pages 199-220
DOI: http://dx.doi.org/10.12989/acc.2018.6.2.199
 
Effects of sulphuric acid on mechanical and durability properties of ECC confined by FRP fabrics
Mehmet Eren Gulsan, Alaa Mohammedameen, Mustafa Sahmaran, Anil Nis, Radhwan Alzeebaree and Abdulkadir Cevik

 
Abstract     [Full Text]
    In this study, the effects of sulphuric acid on the mechanical performance and the durability of Engineered Cementitious Composites (ECC) specimens were investigated. The carbon fiber reinforced polymer (CFRP) and basalt fiber reinforced polymer (BFRP) fabrics were used to evaluate the performances of the confined and unconfined ECC specimens under static and cyclic loading in the acidic environment. In addition, the use of CFRP and BFRP fabrics as a rehabilitation technique was also studied for the specimens exposed to the sulphuric acid environment. The polyvinyl alcohol (PVA) fiber with a fraction of 2% was used in the research. Two different PVA-ECC concretes were produced using low lime fly ash (LCFA) and high lime fly ash (HCFA) with the fly ash-to-OPC ratio of 1.2. Unwrapped PVA-ECC specimens were also produced as a reference concrete and all concrete specimens were continuously immersed in 5% sulphuric acid solution (H2SO4). The mechanical performance and the durability of specimens were evaluated by means of the visual inspection, weight change, static and cyclic loading, and failure mode. In addition, microscopic changes of the PVA-ECC specimens due to sulphuric acid attack were also assessed using scanning electron microscopy (SEM) to understand the macroscale behavior of the specimens. Results indicated that PVA-ECC specimens produced with low lime fly ash (LCFA) showed superior performance than the specimens produced with high lime fly ash (HCFA) in the acidic environment. In addition, confinement of ECC specimens with BFRP and CFRP fabrics significantly improved compressive strength, ductility, and durability of the specimens. PVA-ECC specimens wrapped with carbon FRP fabric showed better mechanical performance and durability properties than the specimens wrapped with basalt FRP fabric. Both FRP materials can be used as a rehabilitation material in the acidic environment.
 
Key Words
    Engineered Cementitious Composite (ECC); carbon fiber; basalt fiber; polyvinyl alcohol fiber; sulphuric acid attacks
 
Address
Mehmet Eren Gulsan: Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey
Alaa Mohammedameen: Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey; Department of Civil Engineering, Dohuk Polytechnic University, Dohuk, Iraq
Mustafa Sahmaran: Department of Civil Engineering, Hacettepe University, Ankara, Turkey
Anil Nis: Department of Civil Engineering, İstanbul Gelisim University, Istanbul, Turkey
Radhwan Alzeebaree: Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey; Department of Civil Engineering, Dohuk Polytechnic University, Dohuk, Iraq
Abdulkadir Cevik: Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey.

 
References
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