Effect of Elevated Temperature on Mechanical Properties of Limestone, Quartzite and Granite Concrete

Abstract

Although concrete is a noncombustible material, high temperatures such as those experienced during a fire have a negative effect on the mechanical properties. This paper studies the effect of elevated temperatures on the mechanical properties of limestone, quartzite and granite concrete. Samples from three different concrete mixes with limestone, quartzite and granite coarse aggregates were prepared. The test samples were subjected to temperatures ranging from 25 to 650°C for a duration of 2 h. Mechanical properties of concrete including the compressive and tensile strength, modulus of elasticity, and ultimate strain in compression were obtained. Effects of temperature on resistance to degradation, thermal expansion and phase compositions of the aggregates were investigated. The results indicated that the mechanical properties of concrete are largely affected from elevated temperatures and the type of coarse aggregate used. The compressive and split tensile strength, and modulus of elasticity decreased with increasing temperature, while the ultimate strain in compression increased. Concrete made of granite coarse aggregate showed higher mechanical properties at all temperatures, followed by quartzite and limestone concretes. In addition to decomposition of cement paste, the imparity in thermal expansion behavior between cement paste and aggregates, and degradation and phase decomposition (and/or transition) of aggregates under high temperature were considered as main factors impacting the mechanical properties of concrete. The novelty of this research stems from the fact that three different aggregate types are comparatively evaluated, mechanisms are systemically analyzed, and empirical relationships are established to predict the residual compressive and tensile strength, elastic modulus, and ultimate compressive strain for concretes subjected to high temperatures.

The Influence of Nanomaterials on the Thermal Resistance of Cement-Based Composites—A Review

“…Moreover, the rough angular surfaces of aggregates (which improve the physical cement paste-aggregate bond), as well as the presence of reactive silica (which improves chemical bonds), are desirable features of aggregates [ 9 ]. In general, aggregates usually remain stable up to 500–600 °C, although some siliceous aggregates, such as flint [ 9 , 11 ], are stable only up to 300–350 °C [ 2 , 12 ]. It has been reported that siliceous aggregates (i.e., quartzite, granite), have worse thermal resistance than carbonatic aggregates (such as limestone or dolomite) [ 3 , 5 , 11 ].…”

Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete

“…A post-fire compressive strength factor of 0.45 is recommended in the general rules for the structural fire design of Eurocode 2 [ 73 ] for normal-weight concrete with siliceous aggregates exposed to 600 °C. The reduction in compressive strength occurs due to the degradation of C-S-H after 400 °C [ 74 ] and the decomposition of Portlandite between 200 °C and 600 °C [ 75 , 76 , 77 ], which is considered the limit for the integrity of concrete mechanical properties. The results of Figure 11 demonstrate that only the concretes with the incorporation of PP fibers and plastic waste were able to reach the 0.45 factor, with the higher residual compressive strengths obtained with the incorporation of 6 kg/m 3 of polymeric addition.…”

Scatter of Constitutive Models of the Mechanical Properties of Concrete: Comparison of Major International Codes

“…• φ 150 mm cylinders: Kliszczewicz (2002, 2007), Atahan et al (2011), Bilodeau and Malhotra (1992), Bravo et al (2015a), Carette et al (1993), Casuccio et al (2008), Demir (2009), Dilbas et al (2014), Dossey et al (1994), Etxeberria et al (2007a-b), Evangelista (2014), Evangelista and de Brito (2017), Gomez-Soberon (2002), Martínez-Abella (2004, 2005), González-Fonteboa et al (2011), Gutierrez and Canovas (1995), Hamad and Dawi (2017), Kheder and Al-Windaw (2005), Kliszczewicz and Ajdukiewicz (2002), Koulouris et al (2004), Naik et al (1998), Omary et al (2018), Paul (2011), Pedro et al (2014), Piasta et al (2017), Pul (2008), Remesar et al (2017), Sadati and Khayat (2016), Sivasundaram et al (1989Sivasundaram et al ( , 1991, Tufail et al (2017), Di Maio (2006, 2009); • φ 100 mm cylinders: Aitcin and Mehta (1990) 2014, Iravani (1996), Jin and Li (2003), Khaliq and Taimur (2018), Kim et al (2002), Kou et al (2007) Vogel and Svecova (2012), Yanagi et al (1998), Yang et al (2008),…”