Abstract
Calcium sulfoaluminate (CSA) cement has recently gained increased attention due to its lower amount of CO2 emissions, as compared to that of the ordinary Portland cement (OPC). This paper evaluates the impact of different types of fibers on the engineering features of CSA-based concretes at different water-cement ratios of 0.35 and 0.28. In this study, metallic fibers including double hooked-end steel fibers and hooked-end steel fibers, and non-metallic fibers (i.e., polyvinyl alcohol (PVA) fibers) were utilized at fiber content of 1%. The mechanical properties of concretes were assessed at different curing ages. Dimensional stability of the concrete mixes was also examined. The morphology of the fractured specimens was studied by using the SEM method. The results indicate that the engineering properties of concrete were improved by introducing fibers to the concrete, irrespective of fiber type. The results show that DHE steel fiber has an important effect on the flexural performance of CSA cement-based concretes and results in deflection-hardening behavior. It was observed that fibers and particularly PVA fibers cause a decrease in shrinkage deformation. Microstructure tests demonstrate that prismatic ettringite is the main hydration product of CSA cement-based concrete. The SEM observation also confirms that the inclusion of CSA cement in concrete improves the cohesiveness between the fibers and cement matrix.
Highlights
Portland cement concrete is utilized for different kinds of infrastructures and its huge amount of consumption over the world make it the most used material on the planet [1,2]
The objective of this study is to explore the impact of different fibers on the engineering properties of concretes manufactured with calcium sulfoaluminate (CSA) cement
It can observed that steel fibers were more effective as compared to Polyvinyl alcohol (PVA) fibers in increasing the strength of be observed that steel fibers were more effective as compared to PVA fibers in increasing the concrete
Summary
Portland cement concrete is utilized for different kinds of infrastructures and its huge amount of consumption over the world make it the most used material on the planet [1,2]. OPC is not considered an eco-friendly material because its production results in a significant fraction of the overall CO2 emissions [4]. Using alternative binders such as calcium sulfoaluminate (CSA), cement can be a promising solution to reducing the amount of CO2 emissions [5]. CSA cements have several applications based on their performance, and this binder has been successfully used in China for the production of concrete in concrete pipes, bridges, precast concrete, waterproof layers, pre-stressed concrete, shotcrete, and low temperature constructions [9,10,11]
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