Arching in concrete slabs strengthened with near surface mounted fibre reinforced polymers

Abstract

This paper outlines basalt fibre reinforced polymer (BFRP) and carbon fibre reinforced polymer (CFRP) strengthening of laterally restrained concrete floor slabs. In-plane restraint has previously been shown to enhance slab capacity due to the development of internal compressive membrane action (CMA), which is not generally included in codified strength assessments. By installing fibre reinforced polymers (FRPs) using the near surface mounted (NSM) technique, disturbance to the existing structure can be minimised. The span-to-depth ratios of test slabs were 20 and 15 and these were constructed with normal strength concrete (~40N/mm 2 ) with 0.15% steel reinforcement. 0.10% FRP (either BFRP or CFRP), was used to strengthen samples which were then compared with control samples. Investigations showed that FRP strengthening and CMA are generally separate, with limited overlap in terms of their contribution to capacity increase. Recommendations are then made for designers to better determine the capacity of FRP strengthened restrained slabs.

Dynamic Mechanical Properties of Slag Mortar with Alkali-Resistant Glass Fiber

“…Alkali-resistant glass fiber, as a material with high monofilament tensile strength, high elastic modulus, alkali resistance, corrosion resistance, and impact resistance, has a wide range of applications in the field of construction engineering, mainly used in non-load-bearing cement components [10]. It can be used as an auxiliary rib material to enhance the performance of concrete, and an appropriate amount of it can effectively improve the toughness of cement matrix [11]. The study by Yue et al [10,12,13] showed that blast furnace slag can be used as a raw material to prepare alkali-resistant glass fibers, and they found that it was a method to recycle waste materials, which improved the value of both, while protecting the environment.…”