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

Abstract

Fire design of post-installed bonded rebars: Full-scale validation test on a 2.94 x 2 x 0.15 m 3 concrete slab subjected to ISO 834-1 fire. Engineering Structures, Elsevier, 2018, 174, pp. AbstractThanks to the improvement in mechanical and adhesion properties of polymer resins, Post-Installed Rebars (PIRs) succeeded progressively in replacing cast-in place rebars in some applications by offering equivalent or even higher mechanical properties at ambient temperature. However, the mechanical behavior of PIRs is essentially governed by the mechanical behavior of polymer resins, which is highly sensitive to temperature. Consequently, fire safety presents a potential hazard that should be taken into account when designing. This paper presents an experimental full-scale fire test carried out on the Vulcain furnace of CSTB Champs-sur-Marne on its 7m x 4 m horizontal configuration, in order to test a new fire design method proposed for PIRs. The 2.94 x 2 x 0.15 m 3 tested slab was mechanically loaded by 325 kg and heated following the ISO 834-1 time-temperature curve until its collapse. The experimental time of collapse is compared to that predicted by the new design method.

Epoxy‐based composite adhesives with improved lap shear strengths at high temperatures for steel‐steel bonded joints

“…[8] When the temperature of an epoxy adhesive exceeds T g , a change in viscosity and physical state occurs, leading to the failure of bond strength between concrete and steel. [40] T g determining the occurrence of molecular mobility transition and related dynamic mechanical property, that is, storage modulus or stiffness, could be obtained from dynamic mechanical analysis. In our system, T g determined from the heat capacity shift in DSC measurements of silica-filled epoxy composite adhesives cured at room temperature were obscured by the exothermic curing peak.…”

Fire Rating of Post-Installed Anchors and Rebars

“…Experimental tests help to model the heating and to calibrate numerical simulations by predicting the failure behavior. For this, Pinoteau [50] and Lahouar [51] conducted large-scale fire tests where a cantilever slab is connected to a wall, using post-installed, and subjected to a ISO 834 (STC) fire.…”

Evaluation of PIRs Post-Fire Pull-Out Strength in Concrete Exposed to ISO 834-1 Fire

“…Pinoteau’s method was validated by performing a full-scale ISO fire on a cantilever-wall connection using PIRs made with polymeric mortars [ 12 ]. Lahouar et al also proposed a non-linear shear lag model taking into account the displacement compatibility between PIRs elements when exposed to high temperatures in the design process (Lahouar’s shear-lag model) [ 13 ]. Both approaches yielded conservative predictions of fire resistances.…”