Residual mechanical strength of glass fiber reinforced reactive powder concrete exposed to elevated temperatures
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Residual mechanical strength of glass fiber reinforced reactive powder concrete exposed to elevated temperatures Syed Safdar Raza1,2 · Liaqat Ali Qureshi1 · Babar Ali3 Received: 31 January 2020 / Accepted: 23 August 2020 © Springer Nature Switzerland AG 2020
Abstract Reactive powder concrete (RPC) has a denser microstructure which makes it vulnerable to spalling when exposed to high temperatures. Extraordinary applications of RPC in structures requiring high strength and durability have drawn the attention to explore the behavior of RPC at high temperatures. This research work aims to study the effect of different dosages of glass fibers (GF) on the mechanical performance of RPC after exposure to high temperatures i.e. 200, 400, 600, and 800 °C. Three main mechanical properties were evaluated such as compressive strength, split tensile strength, and flexural strength. Experiments showed that spalling was significantly controlled using the studied dosages of GF i.e. 2–4%. Effect of dosage on residual mechanical properties varied with the changing temperature. Up to 400 °C, RPC with 3%GF showed maximum residual strength properties, whereas, at 600 and 800 °C, RPC with 4% showed maximum residual mechanical strength. The role of fibers in compressive strength was more useful above 400 °C, whereas, flexural strength and split tensile strength were benefited from GF addition at both normal and elevated temperatures. Keywords Glass fiber · Compressive strength · Elevated temperature · Reactive powder concrete (RPC) · Spalling · Tensile strength · Mechanical properties
1 Introduction In 1995, Richard and Cheyrezy [1] developed a high strength cement-based composite called reactive powder concrete (RPC). Elimination of coarse aggregates and the use of very low water to binder ratios helped in achieving RPC with extremely dense microstructure. Portland cement, silica fume, quartz mineral, and water-reducing admixtures are the main constituents of RPC. In comparison to other members of high strength concrete (HSC) family, RPC possesses very high compressive strength and durability. Due to a very dense microstructure, RPC does not favour the dissipation of internal pressure at elevated temperatures. This consequently leads to the explosive spalling of RPC affecting the strength and durability of
composite badly. RPC having compressive strengths in the range of 200–800 MPa [2, 3] can be manufactured and now it is widely being used in various civil engineering works such as waste storage tanks in nuclear plants, long-span bridges, tall buildings, highway barricades, etc. RPC has evolved as a promising cement-based composite and it is very important to understand and improve its behavior at fire-temperatures. Knowledge in this field is required to resolve issues while repairing fire-exposed RPC structures. Past studies have shown that RPC and other members of the HSC family are vulnerable to spalling and strength degradation at elevated temperatures [4–7]. Using fiberreinforcements in RPCs, spalling resistance and residual s
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