Abstract
The application of textile-reinforced mortar (TRM) as a means of increasing the flexural capacity of two-way reinforced concrete (RC) slabs is experimentally investigated in this study. The parameters examined include the number of TRM layers, the strengthening configuration, the textile fibers material (carbon versus glass), and the role of initial cracking in the slab. For this purpose six large-scale RC slabs were built and tested to failure under monotonic loading distributed at four points. It is concluded that TRM increases substantially the precracking stiffness, the cracking load, the postcracking stiffness, and eventually the flexural capacity of two-way RC slabs, whereas the strengthening configuration plays an important role in the effectiveness of the technique. Simple design equations that provide good estimation of the experimental flexural moment of resistance are proposed.
Highlights
Introduction and BackgroundStrengthening of existing concrete structures has become an urgent need in recent years as a result of aging and/or the necessity to comply with the requirements of modern design codes (i.e., Eurocodes)
textile-reinforced mortar (TRM) is a cement-based composite material that consists of high-strength fibers in the form of textiles combined with inorganic matrices, such as cement-based mortars
One of the characteristics of TRM is its advantages over fiber-reinforced polymers, namely, low cost, resistance at high temperatures, compatibility with concrete and masonry substrates, ability to apply on wet surfaces, and low temperatures and air permeability
Summary
Introduction and BackgroundStrengthening of existing concrete structures has become an urgent need in recent years as a result of aging and/or the necessity to comply with the requirements of modern design codes (i.e., Eurocodes). As the main objective of strengthening methods is to achieve sustainability and cost-effectiveness, the engineering community has progressively turned to the use of advanced structural materials. The introduction of textile-reinforced mortar (TRM) almost a decade ago (Triantafillou et al 2006; Bournas et al 2007) can be recognized as remarkable progress in the field of structural retrofitting. TRM is a cement-based composite material that consists of high-strength fibers (i.e., carbon, glass, or basalt) in the form of textiles combined with inorganic matrices, such as cement-based mortars. One of the characteristics of TRM is its advantages over fiber-reinforced polymers (a broadly used epoxy-based composite material), namely, low cost, resistance at high temperatures, compatibility with concrete and masonry substrates, ability to apply on wet surfaces, and low temperatures and air permeability
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