工程温度条件下氧化镁膨胀剂对混凝土性能的影响

为进一步促进掺氧化镁混凝土的研究与应用,研究了工程温度条件下氧化镁膨胀剂的活性和掺量对混凝土力学性能和变形性能的影响。结果表明:同等条件下,氧化镁活性越高,掺量越大,混凝土强度下降越明显;掺氧化镁膨胀剂的混凝土对养护温度的变化非常敏感,工程温度条件使混凝土强度增长迅速;氧化镁掺量越大,混凝土的膨胀值越大;氧化镁活性值越高,膨胀开始的龄期越短。

Effects of mganesium oxide expansive agents on concrete property under engineering temperature condition

In order to improve studies and application of concrete with light-burned magnesium oxide (MgO concrete),the influence of the chemical activities and the mixing content of MgO expansive agents on the mechanical properties and deformation properties of the concrete under the condition of engineering temperature were studied.The experimental results show that,under the same conditions,the higher the activity and the larger the content of magnesium oxide,the more obvious the decrease of concrete strength.The concrete with magnesium oxide expansive agent is very sensitive to the change of curing temperature,and the engineering temperature conditions make the concrete strength increase rapidly.The larger the content of magnesium oxide,the larger the expansion value of the concrete.The higher the activity of magnesium oxide,the earlier the expansion begins.