Abstract
This study aims to evaluate the effect of curing and drying conditions on the strength properties of concrete containing coal bottom ash (CBA) and fly ash as substitutes for fine aggregates and cement, respectively. The strength properties of the concrete including CBA and fly ash were evaluated under two different curing and drying conditions: saturated surface-dry (SSD) conditions and oven-dried conditions at curing ages of 28 and 91 days. The natural fine aggregates of the mixtures were replaced by CBA fine aggregates at 25%, 50%, 75%, and 100% by volume. In addition, the cement in the mixtures was partly replaced with fly ash at 20% and 40%. The experimental program included the measurement of the unit weight, compressive strength, splitting tensile strength, flexural strength, and ultrasonic pulse velocity of the concrete. The test results showed that the compressive strength, splitting tensile strength, and flexural strength decreased as the CBA content increased under both SSD and oven-dried conditions. The curing and drying conditions of the concrete with CBA and fly ash considerably influenced the reduction in the compressive, splitting, and flexural tensile strengths of the concrete. Additionally, the experimental results showed that fly ash insignificantly contributed to the reduction in the strength properties under both SSD and oven-dried conditions. Finally, the relationships between ultrasonic pulse velocity and the splitting tensile strength, flexural tensile strength, and compressive strength were investigated.
Highlights
Sustainable development in the construction industry is pursued by many nations worldwide, so the utilization of waste from the industry has become more essential
According to the study by Singh and Siddique [12], a decrease in the slump in coal bottom ash (CBA) concrete was observed as the CBA content increased
The decrease in the slump resulted from the higher specific surface area of the CBA fine aggregate compared to that of the natural fine aggregate
Summary
Sustainable development in the construction industry is pursued by many nations worldwide, so the utilization of waste from the industry has become more essential. Several studies have been conducted to investigate the utilization of waste materials in concrete [2,3,4,5]. Among these waste materials, coal bottom ash (CBA) and fly ash are increasingly being released from thermal power plants. Due to the development of concrete technology, CBA and fly ash can currently be utilized as construction materials in concrete [6,7,8,9,10]. Bottom ash with different levels of fineness was used as the replacement of cement in a study by Abdulmatin et al [6]
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