Abstract
High fluidity concrete exhibits an excellent self-compacting property. However, the application of typical high-fluidity concrete is limited in the normal strength range (18~35 MPa) due to the large amount of binder. Therefore, it is important to solve these problems by adding a viscosity modifying agent (VMA) with a superplasticizer (PCE), which helps to improve the fluidity of the concrete. In addition, the rheology and stability of the concrete with VMA can be improved by preventing bleeding and segregation issues. Current studies focused on the physical phenomena of concrete such as the fluidity, rheological properties, and compressive strength of normal-strength, high-fluidity concrete (NSHFC) with different types of a polycarboxylate-based superplasticizer (NPCE). The obtained results suggested that the combinations of all-in-one polycarboxylate-based superplasticizers (NPCE) did not cause any cohesion or sedimentation even stored for a long time. The combination of three types of VMA showed the best fluidity (initial slump flow of 595~630 mm) without any segregation and bleeding, and the compressive strength at 28 days was also found to be the highest: 34–37 MPa. From these results, the combination of PCE (2.0%) + HPMC (0.3%) + WG (0.1%) + ST (0.1%) showed an 18% higher plastic viscosity and -4.4% lower yield stress than Plain.
Highlights
High-fluidity concrete flows under its own weight, filling formwork, and achieves a full compaction, even in the presence of congested reinforcement
With the addition of PCE without viscosity modifying agent (VMA), the slump flow is found to be at 555 mm and 523 mm at the start of the experiment and after 60 min, respectively
This study focused on the physical phenomena, such as fluidity, rheological properties, and compressive strength, of normal-strength, high-fluidity concrete (NSHFC)
Summary
High-fluidity concrete flows under its own weight, filling formwork, and achieves a full compaction, even in the presence of congested reinforcement. Improvement in construction quality and efficiency, shortening the construction time, and reducing labor costs were considered advantages of the high-fluidity concrete that should be highlighted [1]. High-fluidity concrete is affected by the rheology and thixotropy of cementitious materials. There is a large difference in the properties depending on the contents of binders such as cement and mineral admixtures, and the particle size of the aggregate [2]. Most researchers applied a large amount of binder and expensive admixtures to develop self-compacting or high-fluidity concrete [3,4,5,6,7,8]. Many researchers are used smaller-sized coarse aggregates (maximum size of 20 mm or 25 mm) or used fine aggregates at the level of fine fillers [9,10]
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