Abstract
This study investigates the effect of varying ratios of fly ash as a partial replacement for fine aggregate on the performance of alkali-activated municipal slag composites. The strength and other properties of alkali-activated cementitious material (AACM) composites can be optimized by selecting the appropriate mix proportion. In this study, we used fly ash as a substitute for fine aggregate (FA/S) at varying ratios of 0.0, 5.0, 10.0, 15.0, 20.0, 25.0, and 30.0%, mixed with 50% water (W/SL), and 20% alkali activator (AL/SL) content instead of municipal slag (SL) as a core binder, cured in steam conditions. The effects of these substitutions on the initial mixing temperature, slump flow, compressive and splitting tensile strengths, and microstructure analysis of composites cured in steam conditions were investigated at 1, 7, 28, and 91 days. The evaluation of the experimental results revealed that increasing the ratio of fly ash substitution to fine aggregate by up to 20.0% led to a higher strength attributable to the composites, whereas when the extra substitution ratio of FA/S ranged from 25.0–30.0%, significant decreases in strength were observed. The composites’ strengths were estimated using the ACI 209 and ACI 318 design equations and compared to the measured strengths.
Highlights
Published: 22 October 2021The construction sector is one of the main global marketplaces for supplementary cemented materials (SCMs)
The initial mixing temperature is one of the main issues that can directly affect the properties of fresh and hardened activated cementitious material (AACM) composites in the form of increased water demand, accelerated slump loss, reduced setting time, improved plastic shrinkage pattern, decreased strength, and reduced durability
The results indicated that the replacement ratio of (FA/S) up to 20.0% resulted in the highest split tensile strength
Summary
Published: 22 October 2021The construction sector is one of the main global marketplaces for supplementary cemented materials (SCMs). Additional cemented materials (SCMs) can be added as components of concrete. SCMs can affects fresh or plastic concrete and can modify the properties of hardened concrete [3,4]. This is due to the SCMs’ prospected ability to improve the characteristics of concrete through their filler effect. The utilization of SCMs in the form of mineral admixtures serves as a substitute for cement, which might contribute towards preserving the non-renewable resources that are required for cement production, thereby potentially making construction materials more sustainable [7,8,9,10]
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