Evaluation of mechanical and durability properties of engineered cementitious composites exposed to sulfate attack and f
- PDF / 4,369,917 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 15 Downloads / 224 Views
ORIGINAL PAPER
Evaluation of mechanical and durability properties of engineered cementitious composites exposed to sulfate attack and freeze–thaw cycle Alireza Mansoori1 · Kiachehr Behfarnia2 Received: 6 August 2020 / Accepted: 2 November 2020 © Springer Nature Switzerland AG 2020
Abstract In this study, different engineered cementitious composite (ECC) designs were proposed with ground granulated blast slag (GGBS) combined with metakaolin (MK), micro silica (MS), and carbon nanotube (CNT) reinforced with polyvinyl alcohol (PVA) and polypropylene (PP) fibers. The specimens were cured in water, magnesium sulfate solution and exposed to freeze–thaw cycles to test the specimens’ durability. Then, compressive strength, displacement in the middle of span, residual strength, and modulus of rupture of the specimens in different environments were compared. The results indicated that addition of MK had a significant effect on the reduction of permeability. Moreover, replacement of PP fibers with PVA fibers decreased the strength and increased the porosity of the specimens. It was found that the specimen containing 0.015% CNT had better performance compared to other samples. The results of samples cured in aggressive environments indicated that the specimen containing 0.015% CNT had the lowest loss in the value of compressive strength, modulus of rupture, displacement and residual strength in comparison to other mixtures. Furthermore, the use of CNT along with PVA fibers in ECC significantly increased the energy absorption capacity, indicating the CNT’s ability to bridge and close the microcracks in a case of suitable distribution. Keywords Aggressive environments · Carbon nanotube · Displacement · Engineered cementitious composite (ECC) · Modulus of rupture (MOR)
Introduction Concrete has a special role in the construction of various structures. Besides the benefits of concrete as a construction material, high compressive strength is the most effective characteristic, which has resulted in the comprehensive use of concrete. However, concrete has many weaknesses so that researchers have made many efforts to resolve them (Zhang 2014; Afroughsabet et al. 2016). Low tensile strength, brittleness behavior, rapid opening of crack mouth opening, low tensile strain (about 0.01%), and low plasticity are some of * Alireza Mansoori [email protected] 1
Department of Civil Engineering, Faculty of Technical Engineering, Allameh Mohaddes Nouri University, 4641859558 Nour, Iran
Department of Civil Engineering, Isfahan University of Technology, 84156‑83111 Isfahan, Iran
2
these shortcomings. Creating cracks on the concrete surface allows for the penetration of aggressive agents into the concrete, causing corrosion of the reinforced concrete reinforcement and reducing the structural strength of concrete (Zaroudi et al. 2020). Consequently, conventional concrete cannot have high tensile strain due to these defects (Kewalramani et al. 2017). On the other hand, high growth in the construction worldwide increases the use of
Data Loading...
