基于通用旋转组合设计的层布式混杂纤维混凝土配合比研究

RESEARCH ON THE MIX PROPORTION OF THE LAYER CARBON FIBER AND POLYPROPYLENE FIBER CONCRETE BASED ON THE CURRENT ROTATING COMBINATION DESIGN

采用四因子二次回归通用旋转组合设计,对影响层布式碳纤维-聚丙烯混杂纤维混凝土力学性能的主要因素:水胶比、粉煤灰掺量、聚丙烯纤维掺量和碳纤维掺量,进行配合比试验,建立数学模型并确定其最优配比。结果表明:二次多项式回归模型可用于层布式混杂纤维混凝土28 d抗压强度和抗折强度回归方程的建立。层布式碳纤维-聚丙烯混杂纤维混凝土28 d抗压强度理论最大值可达到68.21 MPa,此时W/C为0.3,粉煤灰掺量、聚丙烯纤维掺量和碳纤维掺量均为0;而抗折强度最大值可达到8.84 MPa,此时水胶比为0.3,粉煤灰掺量为0,聚丙烯纤维掺量为1.2%,且碳纤维掺量为1.6%,进一步表明了聚丙烯纤维和层布式的碳纤维对混凝土抗压强度影响不大,但一定程度上可以显著改善其抗折强度。

Some mix tests were carried out for the main factors that effect the 28 d mechanical properties of the layer carbon fiber and polypropylene fiber concrete,such as water-binder ratio,the content of fly ash,the content of the polypropylene fiber and the content of the carbon fiber;then a mathematical model was set up and the optimal mix was determined through the secondary regressive rotating combination design of four factors.The result shows that quadratic polynomial regression model can be used to establish the regression equation of the 28 d compressive strength and flexural strength of the layer carbon fiber and polypropylene fiber conrete.When the water-binder ratio is 0.3,the content of fly ash,the content of the polypropylene fiber and the carbon fiber are zero,the 28 d compressive strength of the layer carbon fiber and polypropylene fiber can reach the maximum 68.21 MPa;while the four factors respectively are 0.3,0,1.2% and 1.6%,the maximum 28 d flexural strength is 8.84 MPa.The effect of polypropylene fiber and the layer carbon fiber on the concrete compressive strength is little,but significant on the concrete flexural strength.