Effect of temperature on the mechanical properties of polymer mortars

Abstract

This paper presents the results of an experimental program to investigate the effect of temperature on the performance of epoxy and unsaturated polyester polymer mortars (PM). PM is a composite material in which polymeric materials are used to bond the aggregates in a fashion similar to that used in the preparation of Portland cement concrete. For this purpose, prismatic and cylindrical specimens were prepared for flexural and compressive tests, respectively, at different temperatures. Measurements of the temperature-dependent elastic modulus and the compressive and flexural strength were conducted using a thermostatic chamber attached to a universal test machine for a range of temperatures varying from room temperature to 90 °C. The flexural and compressive strength decreases as temperature increases, especially after matrix HDT. Epoxy polymer mortars are more sensitive to temperature variation than unsaturated polyester ones.

Experimental and analytical investigations on the behavior of interface between concrete and polymer cement mortar under hygrothermal conditions

“…(2) High temperature increases the porosity of cementitious materials and in PCMs the polymer film which penetrates in pores may be disturbed by high temperature and may responsible for the strength reduction. (3) Polymers in PCM are sensitive to temperature and shows significant reduction in strength with temperature [33,34]. Reis [33] conducted test on polymer mortars and noticed 91.6% reduction in flexural strength at temperature of 90°C.…”

“…(3) Polymers in PCM are sensitive to temperature and shows significant reduction in strength with temperature [33,34]. Reis [33] conducted test on polymer mortars and noticed 91.6% reduction in flexural strength at temperature of 90°C. Biswas & Kelsey [34] has explained the failure model of the polymer mortar with temperature and observed the significant reduction in the tensile strength with increase in temperature.…”

Flexural Behavior of CFRP Laminate at Elevated Temperature

“…Most of the researches have been carried out on fibre reinforced polymers (FRPs) that are used in construction, strengthening and repairing of reinforced concrete structures [12][13][14], for example; Gamage et al [15] concluded that that epoxy loses its strength rapidly at the temperature around 73ºC. Also, Reis, J. M. L. [16] studied the effect of a range of temperatures varying from room temperature to 90ºC on the performance of epoxy and polyester polymer mortars (mixture of foundry sand with the thermoset resin binder) and they concluded that both the flexural and compressive strength are changing inversely with the increase of temperature and the epoxy polymer mortars are more sensitive to temperature variation.…”

Fire design of post-installed bonded rebars: Full-scale validation test on a 2.94 × 2 × 0.15 m3 concrete slab subjected to ISO 834-1 fire

“…In a previous paper [23], we showed that the temperature increase up to values blow the resin glass transition temperature leads to increase the mechanical properties of chemical PIRs due to the resin post-cure phenomenon. However, when temperature exceeds the resin glass transition temperature, a change in viscosity and physical state occur [24], leading therefore to a new bond stress distribution along the bond joint [25] [26]. The influence of the heating increase rate was studies in [5], and it is shown that high heating rates can generate a thermal gradient along the steel rebar and consequently can lead to a new bond stress distribution.…”