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为有效与充分利用工业废料,改善抹灰砂浆的性能,以水胶比、镁渣掺量、外加剂掺量和木质素纤维掺量为因素,设计正交试验方案L16(45),试验研究了镁渣木质素纤维复合抹灰砂浆的性能。应用激光粒度仪分析了镁渣的颗粒级配,扫描电镜分析了镁渣的形貌和砂浆的微观结构,正交试验理论分析了各因素的作用规律,及其显著性,最小二乘法建立了抹灰砂浆和易性参数及力学强度的多元非线性回归模型。在试验研究条件下,镁渣、外加剂和木质素纤维能明显改善砂浆的和易性,木质素纤维对砂浆保水性的影响显著,镁渣对砂浆的流动性稍有不利影响;镁渣和木质素纤维对抹灰砂浆的力学强度有增强效应,木质素纤维对砂浆强度的影响不显著,镁渣掺量有较大影响;建立的回归模型显著性高,相关性好。
In order to effectively and fully utilize the industrial wastes and improve the performance of the plastering mortar, orthogonal design L16 (45) was designed based on the ratio of water to binder, the content of magnesium slag, the content of admixture and the content of lignin fiber. Magnesium slag lignin composite plaster mortar performance. The particle size distribution of magnesium slag was analyzed by laser particle sizer. The morphology of magnesium slag and the microstructure of mortar were analyzed by scanning electron microscopy. The law of action of each factor was analyzed by orthogonal experimental theory. The least square method was used to establish Multivariate Nonlinear Regression Model of Workability and Mechanical Properties of Plastering Mortars. Under the experimental conditions, magnesium slag, admixture and lignin fibers can significantly improve the workability of the mortar, the influence of lignin fiber on the water retention of the mortar is remarkable, and the magnesium slag has slight adverse effect on the fluidity of the mortar; The lignin fiber has an enhanced effect on the mechanical strength of the plastering mortar. The influence of the lignin fiber on the mortar strength is insignificant, and the content of the magnesium dregs has a greater impact. The established regression model is highly significant and has good correlation.