粉煤灰对早强型高延性水泥基复合材料早期力学性能影响

Effect of Fly Ash on Early Mechanical Properties of Early Strength High Ductility Cement-Based Composites

摘要: 早强型高延性水泥基复合材料(SAC-ECC)具有早期强度高、且在拉伸荷载下呈现高延性的水泥基复合材料。为了降低材料成本，以粉煤灰掺量为变量，研究了1 d、3 d龄期SAC-ECC抗压强度和单轴拉伸性能的影响。结果表明：SAC-ECC的早期抗压强度随粉煤灰掺量的增加呈现逐渐减小的趋势，当粉煤灰掺量低于40%时，SAC-ECC 1 d和3 d抗压强度均可达到20 MPa~30 MPa；当粉煤灰掺量超过30%时SAC-ECC 1 d的极限延伸率大于1%，3 d抗拉强度相较于1 d有所下降但仍能表现出较好的延性。

Abstract: Early strength high ductility cement-based composite (SAC-ECC) is a cement-based composite with high early strength and high ductility under tensile load. In order to reduce the material cost, the influence of fly ash content on the compressive strength and uniaxial tensile properties of SAC-ECC at 1 d and 3 d ages was studied. The results show that the early compressive strength of SAC-ECC decreases gradually with the increase of fly ash content. When the fly ash content is lower than 40%, the compressive strength of 1 d and 3 d of SAC-ECC can reach 20 MPa~30 MPa. When the fly ash content exceeds 30%, the ultimate elongation of SAC-ECC 1 d is greater than 1%. Compared with 1 d, the 3 d tensile strength decreases but still shows good ductility.