Study on engineered cementitious composite using different mineral admixtures for bridge deck overlay application

Abstract

Concrete exhibits brittleness under normal and impact loads, and its newlinetensile strength is approximately one-tenth that of its compressive strength. newlineTo address this issue, reinforcement is introduced to enable concrete to newlinewithstand tensile stress and compensate for its lack of ductility and strength. newlineIn addition, inclusion of fibres in reinforcement concrete significantly newlineenhanced the concrete strength. However, to achieve homogeneous tensile newlineproperties, it is crucial to control the development of micro-cracks. The newlineintroduction of fibres into concrete serves as a solution for creating concrete newlinewith improved flexural and tensile strengths. The addition of fibres newlineextensively enhanced the post-cracking behavior, significantly boosted the newlineenergy absorption capacity, and improved the ductility of the composite. newlineEngineered cementitious composites (ECC) in diverse applications newlinehave surged owing to their distinctive tensile strain hardening characteristics. newlineThis is in contrast to the quasi-brittle nature typically associated with fibrereinforced newlineconcrete (FRC). ECC distinguishes itself from its remarkable newlineductility, particularly with moderate fibre content. The mixture comprises newlinecement, fly ash, silica sand, water, fibre, and superplasticizer, deliberately newlineexcluding coarse aggregates to sustain the unique properties of ECC. This newlinecomposition results in a higher tensile strain value, ranging from 3% to 6%, newlinewhich is 500 600 times greater than that of conventional concrete. Notably, newlineECC exhibits a high strain capacity with a fibre volume fraction of newlineapproximately 1.5% to 2%. newline