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为有效与充分利用镁渣,提高抹灰砂浆的抗裂性,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干燥收缩特性。应用正交试验理论分析了各因素的影响规律,及其显著性,微观分析法揭示了镁渣和木质素纤维的减缩机理,最小二乘法建立了抹灰砂浆干燥收缩变形的多元非线性回归模型。试验结果表明:镁渣和木质素纤维对砂浆的干燥收缩变形具有明显的抑制效应,镁渣的微膨胀效应、木质素纤维的保水和拉结效应是使砂浆干燥收缩变形减小的主要内在机制;砂浆干缩变形模型预测结果与实验结果相吻合。
In order to effectively and fully utilize the magnesium slag and improve the crack resistance 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. The drying shrinkage characteristics of magnesium slag lignin fiber composite plastering mortar was studied experimentally. The orthogonal experiment theory was used to analyze the influence of various factors and their significance. The microscopic analysis revealed the reduction mechanism of magnesium slag and lignin fiber. The multivariate nonlinear regression model of the drying shrinkage deformation of the mortar was established by the least squares method . The results show that magnesium slag and lignin fibers have obvious inhibitory effect on the dry shrinkage deformation of mortar. The micro-expansion effect of magnesium slag and the water retention and pull-in effect of lignin fibers are the main internal mechanisms to reduce the dry shrinkage deformation of mortar The predicted results of dry shrinkage deformation model are consistent with the experimental results.