01473523

Component

Rigid concrete overlays have been used for smoothing a damaged surface and/or restoring or improving the mechanical capacity of bridge-decks for many years. The superior ductility with high strength and improved durability characteristics suggest that Engineered Cementitious Composites (ECC) could be used as an attractive alternative to conventional overlay materials, and solutions if a strong mechanical bond is formed between the overlay and the substrate material. An experimental study was performed to evaluate the bond strength between ECC overlay and an ordinary concrete substrate with different types of surface textures including, smooth and rough. Micro-silica concrete (MSC), generally used as an overlay material, were also prepared as a control mixture. ECC and MSC overlay mixtures were cast over the concrete substrate to determine bonding performances. Two test methods; slant shear and splitting prism tests with MSC and two ECC mixtures were used. The experimental results show that when ECC is used as an overlay material, bond strength is significantly increased compared to those of MSC. Under compression loading (slant shear test), the bond strength properties of layered ECC-substrate concrete cylinder specimens is greater than the strength of substrate concrete with compressive strength of around 30 MPa. However, in the case of layered MSC-substrate concrete cylinder specimen, failure consistently occurs at the interface.

This paper was sponsored by TRB committee AFN10 Basic Research and Emerging Technologies Related To Concrete.

01470560

13-1578

English

15p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; Photos; References; Tables

Bond strength (Materials); Bridge decks; Concrete; Concrete overlays; Ductility; Durability; Silica fume

Highways; Materials; I30: Materials

Transportation Research Board Annual Meeting 2013 Paper #13-1578

PRP, TRIS, TRB, ATRI

Feb 5 2013 12:23PM