高钛重矿渣纤维混凝土力学性能试验研究

Mechanical Properties of High Titanium Heavy Slag Fiber-reinforced Concrete

考虑纤维掺量、水胶比和粉煤灰掺量3个主要因素,采用正交试验设计20组高钛重矿渣纤维混凝土试件,结合SEM分析研究纤维掺量、水胶比等因素对高钛重矿渣纤维混凝土力学性能的影响。试验结果表明:水胶比对高钛重矿渣混凝土的抗折与抗压强度影响最大;玄武岩纤维可以显著提高高钛重矿渣混凝土抗折强度,塑钢纤维可以明显提高高钛重矿渣混凝土抗压强度。当水胶比为0.32,玄武岩纤维掺量1 kg,粉煤灰掺量5%时,高钛重矿渣纤维混凝土抗折强度为5.61 MPa,比未掺纤维的高钛重矿渣混凝土提高10%。当水胶比为0.34,塑钢纤维掺量2 kg,粉煤灰掺量5%时,高钛重矿渣混凝土的抗压强度为60.45 MPa,达到GB50010-2010《混凝土结构设计规范》规定的C55等级。

Considering the three main factors of fiber content,water-binder ratio and fly ash content,20 sets of high titanium heavy slag fiber-reinforced concrete specimens were designed using orthogonal experiments.The effect of fiber content,water-binder ratio and other factors on mechanical properties of titanium heavy slag fiber reinforced concrete were studied by SEM.The test results show that the water-binder ratio has the greatest impact on the flexural and compressive strength of the high titanium heavy slag concrete.Basalt fiber can significantly increase the flexural strength of the high titanium heavy slag concrete,and plastic steel fiber can significantly improve the compressive strength of the concrete.When the water-binder ratio is 0.32,the basalt fiber content is 1 kg,and the fly ash content is 5%,the flexural strength of the high titanium heavy slag fiber concrete reaches 5.61 MPa,which is 10%higher than that of the high titanium heavy slag concrete without fiber.At the water-binder ratio of 0.34,the plastic steel fiber content of 2 kg,and the fly ash content of 5%,the compressive strength of the high titanium heavy slag concrete reaches 60.45 MPa,satisfying the C55 level specified in Concrete Structure Design Code(GB50010-2010).