Mechanical Connectors to Enhance the Interfacial Debonding of Concrete Overlays

Abstract

Concrete bonded whitetoppings and overlays usually fail due to a loss of bond between the layers as a consequence of direct actions (traffic loads) or indirect actions (temperature differences or shrinkage in the layers). These actions generate stresses in the interface that may exceed the strength capacity of the union between layers. This paper proposed an innovative solution for this problem that consisted of placing mechanical connectors in the overlay interfaces to provide them with post-cracking strength and maintaining the monolithic response of the pavement. Three experimental programs on real-scale pavements with two types of mechanical connectors were studied under heavy traffic in terms of structural performance. Findings reveal that this technique might be an excellent solution to the problem of interfacial debonding.

A Review of Strength And Behavior of Reinforced Concrete Bridge Deck Slabs Overlaid with Ultra High-performance Concrete (uhpc)

“…A study (Perez et al, 2009) issued a comparison between two types of surface preparation scarification which are a kind of horizontal groove and hydro demolition is a kind of rough, in the result detected that a better bond was obtained with hydro demolition. (López-Carreño et al, 2020) experimented with the influence of mechanical connectors and concluded that screw anchor can provide adequate bond strength but better structural performance obtained with bent rebar, after two years of traffic 10 % of the slab were cracked but none of them failed at the interface. The study (Muñoz & Ángel, 2012) doesn't recommend using a grooved interface because in all experiments failure occurred at substrate except grooved surface only failure occurred at the interface.…”

“…In order to create an equation that gives a minimum amount of error the "IBM SPSS Statistics 26" program is used with dependent and independent variables. This equation is summarized in kinds of literature (Hussein et al, 2016;López-Carreño et al, 2020;Luo, 2002;Newtson & Weldon, 2018;Sadek et al, 2019;Sritharan & Aaleti, 2017;Tayeh et al, 2012;Wibowo & Sritharan, 2018;Yang Zhang, Zhang, et al, 2020;Yang Zhang, Zhu, et al, 2020) on studies which have been performed. Equation 2 assists to understand better the flexural performance and predicting the ultimate failure load of the existing NSC structure which is planned to be strengthened with a UHPC overlay.…”

Rehabilitation of the Pavement of Four Roundabouts by Means of Thin Concrete Reinforcement ("Thin Whitetopping")

“…Su dimensionamiento se hizo para resistir los esfuerzos tangenciales de las cargas de tráfico en la interfase entre los hormigones. Puede encontrarse más detalle del dimensionamiento en [6].…”

Fine-grained Concrete Mix Design using Statistical Methods for Ultra-thin Whitetopping Overlay Application

“…Fine grain or reactive powder concrete is a high -performance concrete with high strength, high strength and low porosity [18]. Increasing the fineness and activity of the components and removing coarse aggregates to minimize internal defects of concrete (pore space and minor cracks) are the basic principles of achieving strength and strength extremely durable [19][20][21]. Compared with conventional concrete, the fracture strength of high -performance concrete is one step higher.…”