ABSTRACT
Due to the lack of durability, the rate of deterioration for existing concrete infrastructures is alarming. The demand for fast and durable concrete repair materials is urgent. This paper reports a fast and durable materials, entitled High-Early-Strength Engineered Cementitious Composites (HES-ECC). This material can be applied to large scale repair or retrofit applications, such as long span steel bridge deck, where the time requirement has to be finished in limited time. In this study the PE fiber is used in ECC to completely replace PVA fiber, thus reduce the volume of fiber. Two particle size of sand (40 μm and 100 μm in average) is used in this research. Experiments of HES-ECC were conducted on compressive strength, crack width and tensile properties. In this paper, HES-ECC achieves a compressive strength of 23.4 MPa and tensile stress of about 2.51 MPa after six hours with strain capacity over 2%. Moreover, HES-ECC exhibits high strain capacity under uniaxial tension along with a self-controlled crack width of below 60 μm. HES-ECC is a potential candidate material for fast and durable concrete repairs.
