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The IUP Journal of Structural Engineering :
The Effect of Elevated Temperature on Polypropylene Fiber Reinforced Scc.
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Concrete is an extensively used construction material across the globe. It must justify some primary characteristics such as workability, strength and durability. To achieve these characteristics, it is important to lay emphasis on mix design that yields the above-said characteristics along with conservation of energy and materials. Self-Compacting Concrete, also known as Self-Consolidating Concrete (SCC), has revolutionized construction industry with its special characteristics such as high fluidity, filling and passing abilities, strength and durability. In this paper, SCC of M30 grade was prepared with partially replaced M-sand using Nan-Su method of mix design. Polypropylene fibers were added in successive volume fractions of 0.05, 0.10 and 0.15% to the optimized mix (40% replacement of natural river sand by M-sand). Rapid Chloride Permeability Test (RCPT) was conducted for 28 days cured specimens to understand polypropylene fiber influence on durability characteristics. It is also of paramount importance to study the behavior of SCC at elevated temperatures. It is generally observed that strength and durability of SCC are reduced at higher temperatures. It becomes relevant in structures such as power plants, chimneys and runways. The reduction in strength for polypropylene fiber reinforced SCC with successive increment of temperature from 200 C to 600 C was studied.

 
 

Self-Compacting Concrete (SCC) was first developed in Japan in the year 1986. It has excellent deformability and segregation resistance. It can flow through and fill gaps of reinforcement without any external vibration (Nan-Su et al., 2001). It has large portion of fine aggregate in comparison with coarse aggregate. Due to scarcity of natural river sand nowadays, manufactured sand (M-sand) is considered as a promising alternative to river sand. It is observed that partial replacement of river sand by M-sand results in reduced workability and increased compressive strength of SCC (Tuljaramsa and Gundakalle, 2015).

In the study, Nan-Su method of mix design has been used to get the appropriate mix proportion. Natural river sand was replaced in succession of 10%, 20%, 30% and 40% by M-sand. Further, polypropylene fibers were added to concrete with 40% replacement of river sand by M-sand which yielded optimum results. Fibers were added in successive volume fractions of 0.05%, 0.1% and 0.15% of concrete. It is generally used as temperature and shrinkage reinforcement. Typical properties of polypropylene fibers are density = 0.90 g/cc, tensile strength = 550 to 690 MPa and modulus of elasticity = 3.4 GPa (Ziad and Mubarak, 2002).

 
 

EFNARC, M-sand, Ground Granulated Blast Furnace Slag (GGBS), Polypropylene fiber, Compressive strength, Chloride penetration, Elevated temperature .