改性剂对硫氧镁水泥性能的影响

硫氧镁水泥早期强度低和耐水性差的缺点严重影响了硫氧镁水泥及其制品的使用.采用柠檬酸和聚乙二醇两种改性剂对硫氧镁水泥进行改性.通过掺入不同种类和不同掺量的改性剂,研究对硫氧镁水泥性能的影响.研究结果表明:掺入两种改性剂均可以提升硫氧镁水泥的力学性能和耐水性能.当柠檬酸掺量在0~1.5%范围内变化时,随着柠檬酸掺量的增加,硫氧镁水泥的7、28 d抗折强度、抗压强度和软化系数均先增加后降低,在掺量为0.7%时7、28 d抗折强度、抗压强度和软化系数均最高.当聚乙二醇掺量在0~4.0%范围内变化时,随着聚乙二醇掺量的增加,硫氧镁水泥的7、28 d抗折强度、抗压强度和软化系数均先增加后降低,在掺量为3.0%时7、28 d抗折强度、抗压强度和软化系数均最高。

Effect of modifier on the properties of magnesium oxysulfide cement

The low early strength and poor water resistance of magnesium oxysulfide cement seriously affect the use of magnesium oxysulfide cement and its products.Two modifiers of citric acid and polyethylene glycol were used to modify the magnesium oxysulfide cement.Effect on the properties of the magnesium oxysulfate cement are studied by incorporating different kinds and different amounts of modifiers.The results show that the incorporation of two modifiers can improve the mechanical properties and water resistance of magnesium oxysulfide cement.When the amount of citric acid added changes in the range of 0 to 1.5%,with the increasing of citric acid,the flexural strength and compressive strength of 7 days and 28 days and softening coefficient of magnesium oxysulfide cement increase first and then decrease,when the dosage is 0.7%,the flexural strength and compressive strength of 7 days and 28 days and softening coefficient of magnesium oxysulfide cement are highest.When the amount of polyethylene glycol added changes in the range of 0 to 4.0%,with the increasing of polyethylene glycol,the flexural strength and compressive strength of 7 days and 28 days and softening coefficient of magnesium oxysulfide cement increase first and then decrease,when the dosage is 3.0%,the flexural strength and compressive strength of 7 days and 28 days and softening coefficient of magnesium oxysulfide cement are highest.