Abstract
The goal of this study is to assess the fresh and hardened properties of self-compacting concrete (SCC) prepared using locally available materials. This research includes also the impact of polypropylene (PP), steel and hybrid fibers on the same properties. In addition, the mechanical properties of SCC specimens (with and without fibers) at high temperatures, including as compressive, tensile, and flexural strengths, will be determined. Four different SCC mixtures (with and without fibers) are prepared, tested, and assessed in order to attain these goals. The specimens were heated to various temperatures (200, 400, 600, and 800) at a rate of 5 degrees Celsius per minute for each test. The temperature was remained constant at the target temperature for one hour before cooling to ensure a consistent temperature throughout the specimen. According to the test results, all of the mixes have good consistency and workability in terms of filling and passing ability. In addition, the inclusion of fibers lowered the workability of SCC slightly. Also, the compressive, tensile, and flexural strengths improved with increasing temperature up to 200 °C and dropped at temperatures over 200 °C, according to these findings. Within the SCC, the PP fibers lowered and removed the risk of spalling. Concrete mixtures containing steel fibers and hybrid fibers have the finest mechanical characteristics and spalling resistance as temperature rises. Weight losses were lower in SCC mixtures with PP and steel fibers than in those without PP and steel fibers. As the temperature rose, all SCC mixes lost mass and UPV decreased until the samples spalled (as in plain SCC and SCC with steel fibers) or were questionable (as in SCC with PP and SCC with hybrid fibers). Doi: 10.28991/cej-2021-03091779 Full Text: PDF
Highlights
Self-compacting concrete (SCC) was first developed in Japan in the mid-1980s with the goal of reducing durability issues in complex and substantially reinforced concrete structures caused by a shortage of skilled employees and inadequate communication between designers and construction engineers [1]
SCC is a type of concrete that can flow under its own weight and entirely fill the formwork, retaining homogeneity even when reinforcement is present, and consolidate without the use of vibration
The stated principles mentioned in standards such as EFNARC are one approach to identify the behavior of concrete and determine whether it fits certain specific requirements for its use or not
Summary
Self-compacting concrete (SCC) was first developed in Japan in the mid-1980s with the goal of reducing durability issues in complex and substantially reinforced concrete structures caused by a shortage of skilled employees and inadequate communication between designers and construction engineers [1]. Hardened concrete is dense and uniform, with the same engineering properties and durability as traditional vibrated concrete [2, 3]. Various types of filler have been frequently employed in SCC as a partial cement substitute in recent years. SCC could become a more sustainable material as a result of this substitution [4]. As a partial substitute for cement, SCC produced with micro-fillers and mineral admixtures becomes cost effective [6]. Several studies have studied the influence of mineral additives on the fresh and hardening properties of SCC [7,8,9,10]. When compared to ordinary concrete created with vibrators, SCC is typically made with a lower water cement ratio, resulting in higher strength, lower permeability, and greater durability. Researchers [16, 17] added steel fibers to SCC and found that, having a lower shear strength than conventional concrete, SCC with fibers achieved resistance values comparable to traditional vibrated concrete
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