Abstract
Fiber grid reinforcements are widely used in construction, especially in the rehabilitation of structures; short fibers are also used in concrete. However, reinforcing mortars with textiles (fiber gratings) which offers an improved concrete, and a wide variety of new and exciting architectural forms, is still a relatively new application that shows a need for research. Tests on the use of Glass Fiber Grids (GFG) and Polypropylene Grids (PPG) in the concrete matrix which can be an interesting solution to improve the bearing capacity and change the failure mode of slabs subjected to a load of punching have been realized. The results showed a significant increase in the bearing capacity, a better distribution of the cracks, as well as an improvement of the deflexion before failure; compared to unreinforced reference slabs.
 In order to understand the behaviour of the concrete-GFG interface of the tested slabs, a modeling of this latter was carried out using a constitutive law expressing the shear stress between the two materials as a function of the relative sliding between the surfaces in contact, taking into account the mechanical characteristics of both materials. The analysis of the bond-slip curve obtained has shown that the use of the glass fiber grid inside the concrete matrix allows a better behaviour of the interface between constituent materials with respect to the glued fiber-reinforced polymer (FRP) plates on the surface of the slab.
Highlights
New techniques that involve the use of composite materials in construction are currently being studied in different works (Ait Tahar and Bouzeboudja, 2011)
In the framework of this work, we have proposed a method of internal reinforcement of concrete slabs, by Glass Fiber Grids (GFG) and PPG grids, embedded in the concrete matrix at the level of the lower fibers and ISSN 2353-0057, EISSN : 2600-6936
This reinforcement of slabs has a gain in terms of bearing capacity of the order of 104.18% and of ductility estimated at 86.06%
Summary
New techniques that involve the use of composite materials in construction are currently being studied in different works (Ait Tahar and Bouzeboudja, 2011). These methods are booming as these innovative materials have important advantages over traditional materials such as: lightness, mechanical and chemical resistance, freedom of shape and prolonged life. Vast research on TRC was carried out, so as to examine the use of TRC for subsequently strengthening the bending load capacity of existing concrete or reinforced concrete elements (Carozzi et al, 2016). (2018) 5: 137-146 top of the slab, to improve the bearing capacity and change the failure mode of these elements This method consists of carrying out additional reinforcement to the traditional steel. A study of the interfacial behaviour of the materials used for making the tested slabs, using an existing model in the literature to establish a relationship between the slip and the adhesion stress developed at the interface between the two materials is presented
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