Effect of aggressive environment on durability of concrete containing fibrous rubber shreds and silica fume

Abstract

The present study deals with the investigation of durability properties of reinforced concrete fabricated by incorporating fiber type rubber shreds as fine aggregate in concrete and silica fume as a supplementary cementitious material. Concrete designs were produced to replace natural fine aggregate and cement by rubber shreds, and silica fume, respectively. The concrete mixes were studied for compressive strength up to 365 days, abrasion resistance, and water absorption up to 28 days. The carbonation and acid resistance (H 2 SO 4 and HCl) properties were studied up to 90 and 180 days, respectively. Corrosion samples were tested up to 18 months for both macrocell current and halfcell potential. The incorporation of rubber shreds lowered the compressive strength of concrete and resistance to water absorption, carbonation, and corrosion. However, the resistance to abrasion and acid attack was enhanced on the utilization of rubber shreds in concrete. The presence of silica fume considerably enhanced the mechanical and durability properties of rubber shreds concrete and lowered the probability of corrosion.

Effect of acids and freeze–thaw on the durability of modified rubberized concrete with optimum rubber crumb content

“…However, when the concrete is boiled in hot water, the RuC shows a higher water absorption value than conventional concrete. Similar results of the water absorption of RuC are found in past studies 22,61,62 . The disintegration of rubber crumbs trap water adjacent to the concrete structure and generates interfacing zones prone to high water absorption, which might cause an increase in water absorption when the R3 mix is boiled.…”

“…The curing days do not affect compressive strength after 15% replacement, and the results are similar to those obtained after 28 days of curing. RuC loses 18%–67% of its compressive strength compared with standard concrete after 7 days, 17%–65% after 14 days, 16%–64% after 28 days, and 18%–66% after 90 days, with a replacement amount of rubber crumb of 10%–30%.” 14 Other researchers 13,22,24,52,58,59 found a similar decrease in compressive strength in their investigation. The poor connection between the concrete and the rubber crumbs is responsible for the concrete's mechanical strength reduction, resulting in little adhesion at the concrete‐rubber interface.…”

“…Different types of rubber aggregate (crumb, ash, and fibers) are also found to have different effects on the properties of concrete, according to previous studies 16–18 . Several previous types of research focus on using crumb rubber aggregate as a partial replacement of FA reported poor mechanical and durability properties 19–26 . Some studies have recommended adding rubber crumbs in concrete with pozzolanic ingredients such as silica fume and fly ash to minimize the adverse effects on concretes' fresh and mechanical characteristics 27,28 .…”

“…Rubber shreds in concrete improved the resistance to abrasion and acid attack but reduced the RuC's compressive strength. Rubber shreds are resistant to acidic solutions because of their tough, stable, and hydrophobic structure 22 . The use of a higher concentration of sulfuric acid accelerates the decay of specimens to the point that an indication test can be performed within 90 days 31 .…”

Properties of Sustainable Concrete Containing Red Mud: A Review

“…The splitting tensile strength was recorded to be greater than that of the reference mix, up to 10% red mud, while 15% red mud shows a tensile strength close to that of the reference mix [18]. Similar results showed by other researcher [2,3,58]. For higher replacement levels (more than 15% red mud) the tensile strength reduced as compared with control concrete.…”