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在混凝土中掺氧化镁可提高混凝土抗裂性。试验研究了外掺氧化镁混凝土的弹性模量、极限拉伸值、干缩率、自生体积变形等变形性能,并探讨分析了氧化镁对混凝土变形性能的影响机理。试验结果表明,外掺氧化镁的混凝土弹性模量与未掺的基本相当,极限拉伸值和干缩率小幅降低,自生体积变形从收缩转为微膨胀。总的来说,掺入氧化镁可以在一定程度上改善混凝土的变形特性,有利于提高混凝土的抗裂能力。
Adulteration of magnesium oxide in concrete can improve the crack resistance of concrete. The effects of magnesia on the deformability of concrete were analyzed, such as the elastic modulus, ultimate tensile strength, shrinkage and autogenous volume deformation. The experimental results show that the elastic modulus of MgO-doped concrete is basically the same as that of unadhered concrete, the ultimate tensile strength and dry shrinkage decrease slightly, and the autogenous volume deformation changes from shrinkage to micro-expansion. In general, the incorporation of magnesia can improve the deformation characteristics of concrete to a certain extent, is conducive to improving the cracking resistance of concrete.