Abstract
Self-compacting concrete (SCC) has high flow ability and high resistance to segregation and bleeding. These characteristics facilitate the mixing, casting and finishing of SCC without using compacting or vibrating machines. Adding mineral admixtures, such as fly ash (FA), and superplasticizers improves SCC properties by preventing segregation and bleeding and by increasing rheological parameters. SCC requires high flow ability under the influence of self-weight to completely fill all mold parts for full compaction. This paper discusses the results of an experimental investigation on the properties of SCC and self-compacting fiber reinforced concrete (SCFRC) mixtures with the inclusion of polypropylene fibers (PFs) and containing FA at replacement rates of 0%, 20%, 40%, and 60 % cement mass. The compressive, flexural, and split tensile strengths of the prepared concrete samples were investigated at ages of 7, 14, 28, and 90 days. The workability of fresh concrete mixtures was also studied through segregation, bleeding, slump flow, slump flow T50, L-box V-funnel T5, and V-funnel tests. Results showed that the best properties of fresh SCCs were obtained when FA was added at replacement rates of 20% and 40% cement mass. In addition, the inclusion of PFs at a volumetric ratio of 0.22% decreased segregation and bleeding and improved the flexural and tensile strengths of SCFRCs.
Highlights
Self-compacting concrete (SCC) and selfcompacting fiber reinforced concrete (SCFRC) are special types of concrete mixture that is characterized by resistance to bleeding and segregation
The results indicated that SCC and SCFRC mixtures that contained fly ash (FA) at replacement rates of 20% and 40% cement mass met the requirements for SCC
The following conclusions were drawn from the results of this study: 1. The addition of FA positively affected the properties of fresh concrete and the compressive strength of mixtures at all ages
Summary
Self-compacting concrete (SCC) and selfcompacting fiber reinforced concrete (SCFRC) are special types of concrete mixture that is characterized by resistance to bleeding and segregation. Numerous researchers have reported that adding fibers at volumetric ratios of 0.1% to 1.0% improves the strength and engineering properties of ordinary concrete (Mohamed, 2006; Banthia and Gupta, 2006; Al Qadi et al, 2011; Islam and Gupta, 2016). FA has been successfully added to SCC at replacement rates of up to 60% cement mass, and at a replacement rate of 35% cement mass to cement mixtures without the inclusion of PFs. Previous studies on the properties of SCCs have and hardened SCC and SCRFC. PFs were added to the cement mixtures at a volumetric ratio of 0.22% to produce SCFRC. The compressive, flexural, and tensile strengths of hardened concrete at ages [7, 14, 28], and 90 days were investigated
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