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针对镁渣利用率低,以及对现代混凝土尺寸稳定性要求高的问题,以镁渣掺量、掺合料取代率和矿粉复合率为因素,设计正交试验方案,试验研究镁渣复合掺合料混凝土的干燥收缩特性,分析作用规律,建立关系模型,微观结构分析掺合料的作用机理。结果表明:镁渣复合掺合料混凝土的干缩变形与时间呈相关性很好的双曲线关系,其拟合参数的关系模型显著性水平高,与各因数的相关性好;混凝土的干缩变形随镁渣掺量和掺合料取代率的增大而减小,随矿粉复合率的增大而增大,作用的重要性次序为镁渣掺量、掺合料取代率和矿粉复合率;镁渣对混凝土干缩的作用效应随时间逐渐增大,90 d基本趋于稳定,测定龄期内混凝土仅有收缩,无膨胀变形,掺入适量的镁渣来补偿混凝土的收缩变形是可行的。
In view of the low utilization rate of magnesium slag and the high requirement on the dimensional stability of modern concrete, orthogonal design was designed based on the content of magnesium slag, the substitution rate of admixture and the composite ratio of slag. Drying shrinkage characteristics of the aggregate concrete, analysis of the law of action, the establishment of a relationship model, microstructure analysis of the role of admixture mechanism. The results show that the dry shrinkage deformation of magnesium slag composite admixture has a good hyperbolic relationship with time, the fitting parameters of the model significantly higher level of correlation with the various factors of good correlation; dry shrinkage of concrete The deformation decreases with the increase of the content of magnesia slag and the substitution rate of admixture, and increases with the increase of the composite rate of slag, the order of importance is the content of magnesia slag, the substitution rate of admixture and mineral powder The effect of magnesium slag on concrete shrinkage gradually increases with time, and basically stabilizes after 90 days. Concrete only shrinks and expands without deformation during the test period, and incorporates the appropriate amount of magnesium slag to compensate the shrinkage deformation of concrete It works.