Performance of self-compacting concrete containing hybrid fibers in aggressive environment

Abstract

Self-compacting concrete can be used in many concrete applications some of it susceptible to acid attacks. The aims of this study are to investigate the resistance of different SCC mixture designs to sulphuric acid attacks. The test variables included the type of hybrid fibers (steel, plastic and polypropylene fibers). The powder content of the mixes was kept constant. (500)Kg/m3. The slump flow, L-box, and V-funnel were performed for mixes in their fresh state. In the present work, the specimens were immersion in sulphuric acid solution at concentration of (0.5%) up to 289 days after normal curing for 28 days. After concrete has hardened, two types of test are performed before and after immersion in sulphuric acid solution. Firstly destructive tests are conducted including (compressive strength, splitting tensile strength, and modulus of rupture). Secondly non-destructive tests are performed including (mass loss). The result obtained from this work, shows that the use of hybrid fiber was significant in improving the resistance to sulphuric acid solution in the case of splitting tensile strength, mass loss and modulus of rupture on the other hand, the use of hybrid fibers was insignificant in reducing the concrete compressive strength loss.

Keywords

• self-compacting concrete
• hybrid fibers
• sulfuric acid