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考虑玄武岩纤维增强树脂合物基复合材料(BFRP)格栅层数和水泥基复合材料(ECC)配比等因素,对BFRP增强大掺量粉煤灰/矿粉ECC棒骨试件进行了静力单轴拉伸试验,研究掺加增强粉煤灰/矿粉ECC的抗拉力学性能。结合试验数据,基于Richard和Abbot的弹塑性应力-应变公式提出掺加增强ECC的应力-应变本构关系模型。试验结果表明:随着掺加层数的增加,格栅增强ECC的极限抗拉强度显著增大。同配合比掺矿粉制成的ECC抗压强度、开裂应变及应力高于掺粉煤灰制成的ECC。掺加增强掺矿粉ECC试件相对掺粉煤灰ECC试件具有较好的抗拉力学性能。计算结果表明,建立的单轴受拉本构关系模型可以有效地预测掺加增强ECC的应力-应变关系和极限抗拉强度。
Considering the factors such as the number of BFRP grids and the proportion of cement-based composites (ECC), the BFRP reinforced high strength fly ash / Uniaxial tensile test was conducted to study the tensile mechanical properties of fly ash / slag modified ECC. Combined with the experimental data, a stress-strain constitutive relation model of ECC with additive strengthening is proposed based on the elasto-plastic stress-strain formula of Richard and Abbot. The experimental results show that the ultimate tensile strength of grid-reinforced ECC increases significantly with the increase of doped layers. The compressive strength, cracking strain and stress of ECC made of slag mixed with the same ratio are higher than those of ECC made of fly ash. The ECC specimen doped with the enhanced slag-doped ECC specimen has better tensile mechanical properties than that of the fly ash-bonded ECC specimen. The calculated results show that the established uniaxial tensioned constitutive model can effectively predict the stress-strain relationship and ultimate tensile strength of ECC.