Abstract
This paper reports the findings of the effect of elevated temperature on the compressive strength and durability properties of crumb rubber engineered cementitious composite (CR-ECC). The CR-ECC has been tested for its compressive strength and chemical resistance test against acid and sulphate attack. Different proportions of crumb rubber (CR) in partial replacement to the fine aggregate and polyvinyl alcohol (PVA) fiber have been utilized from 0 to 5% and 0 to 2%. The experiments were designed based on a central composite design (CCD) technique of response surface methodology (RSM). After 28 days curing, the samples were preconditioned and exposed to high temperatures of 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C, and 1000 °C for one hour. Although the residual compressive strength of CR-ECC was negatively affected by elevated temperature, no explosive spalling was noticed for all mixes, even at 1000 °C. Results indicated that CR-ECC experiences slight weight gain and a reduction in strength when exposed to the acidic environment. Due to the reduced permeability, CR-ECC experienced less effect when in sulphate environment. The response models were generated and validated by analysis of variance (ANOVA). The difference between adjusted R-squared and predicted R-squared values for each model was less than 0.2, and they possess at least a 95% level of confidence.
Highlights
The ever-increasing environmental problem caused by waste tire disposal has made the use of crumb rubber in engineered cementitious composite (ECC) one of the viable alternatives to eradicating the menace
It was discovered that the ECC lost its tensile strain-hardening capacity at a temperature beyond 200 ◦ C, and its tensile strength reduced by approximately 40% [19]
The materials used in preparing the crumb rubber engineered cementitious composite (CR-ECC)
Summary
The ever-increasing environmental problem caused by waste tire disposal has made the use of crumb rubber in engineered cementitious composite (ECC) one of the viable alternatives to eradicating the menace. The alarming rate by which waste tire is generated is posing a threat to human health and the safety of the environment. This is because the dumpsite becomes breeding grounds for pests and vermin [2]. To address this global problem, various research is conducted to examine numerous possible applications of recycled tire rubber [3,4,5].
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