High temperature behaviour of polypropylene fibres reinforced mortars

Abstract

International audienceThe aim of this paper is primarily experimental and is intended to analyse the behaviour of two cementitious materials, before and after heat treatment: one unreinforced (i.e. without fibres) and the other reinforced (with polypropylene fibres).At room temperature and after heating up to 500 °C, the bending strength is improved by the presences of fibres. The residual young modulus is slightly higher for the fibres reinforced samples.As the temperature increases, the strength gain due to fibres inclusion is reduced. Beyond 500 °C, the bending strength is lower for the fibre reinforced cementitious material compared to those without fibres. Fracture energy is also improved for the fibre mortars at room temperature. At 400 °C this improvement decreases gradually with the introduction of polypropylene fibres. Beyond this temperature and due to the introduction of polypropylene fibres, the fracture energy is reduced.Another test is developed: rapid heating due to exposure to a flame. The temperature in the front side reaches in few seconds 1000 °C. At this temperature and after one hour of exposure, the opposite side reached 140 °C. After cooling, the punching shear strength of the fibre mortar is definitely weaker than of the mortar without fibre

Investigation of mechanical properties of polymer impregnated concrete containing polypropylene fiber by taguchi and anova methods

“…It is known in literature that the fibers increase the strength properties such as splitting tensile strength, bond strength, flexural strength, ductility and toughness (Czigány, 2006;Deák, Czigány, Tamás, & Németh, 2010;Li, 2009;Matkó et al, 2003;Sobczak, Brüggemann, & Putz, 2013;Unterweger, Brüggemann, & Fürst, 2014b). If polypropylene fibers are used in the concrete, the micro and macro-cracks on the surface of concrete shows the decrease (Ezziane, Kadri, Molez, Jauberthie, & Belhacen, 2015;Grzybowski & Shah, 1990).…”

Analysis of fire resistance of cement mortars with mineral wool from recycling

“…There are numerous investigations that analyse the fire resistance of cement mortars with different additions, since their mechanical properties can be affected although it is known that they can withstand high temperatures due to their low thermal conductivity and high specific heat [10,11]. Pozzolans are used as additions in most investigations of the fire resistance of mortars [12,13], but the mechanical benefits of the compounds when adding other types of fibres have also been proven [14][15][16].…”

Effect of polypropylene fibers on high strength mortar subjected to elevated temperature

“…The increase of the temperature, the strength gain due to fibers inclusion reduced. In the case of beyond 500 °C, the bending strength of fiber-reinforced cementitious material is lower than that of those without fibers [4]. In another research, a test was conducted on three different fibers for mortar.…”