Evaluation of Engineering Properties of Calcium Sulfoaluminate Cement-based Concretes Reinforced with Different Types of Fibers

Calcium sulfoaluminate (CSA) cement has recently gained increased attention due to its lower amount of CO 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...

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Bibliographic Details
Published in:Materials 2019-07, Vol.12 (13), p.2151
Main Authors: Afroughsabet, Vahid, Biolzi, Luigi, Cattaneo, Sara
Format: Article
Language:English
Subjects:
Aggregates
Calcium
Cement
Concrete mixing
Dimensional stability
Ettringite
Hydration
Mechanical properties
Morphology
Polyvinyl alcohol
Portland cements
Reinforced concrete
Reinforcing steels
Scanning electron microscopy
Stability analysis
Steel fibers
Sulfoaluminate cement
Tensile strength
Water-cement ratio
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Summary:Calcium sulfoaluminate (CSA) cement has recently gained increased attention due to its lower amount of CO 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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12132151