The influence of different artificial sand gradations and stone powder content on the uniaxial tensile proper-ties of Hydraulic Engineered Cementitious Composites(HECC)was studied by tensile properties test.The effects of dif-ferent sand gradation and age on the microstructure and fiber state of ECC were analyzed by SEM.Results show that the tensile strength of hydraulic ECC prepared by single and continuous graded artificial sand increases with the increase of age,and the ultimate tensile strain decreases with the increase of age.Among them,the single graded ECC with artificial sand particle size less than 0.16 mm has no obvious multi-crack phenomenon.In addition,with the increase of stone pow-der content,the tensile strength of ECC showed a trend of increasing,and the ultimate tensile strain showed a trend of de-creasing.ECC with 15％stone powder content has the best tensile properties.7 d tensile strength and ultimate tensile strain of ECC are 4.08 MPa and 3.35％,respectively.
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