高温后水泥基灌浆料力学性能试验研究

Experimental Study on Mechanical Properties of Cement-Based Grout after High Temperature

灌浆料由于具备高强度、无收缩等特性,被广泛应用于装配式构件连接及建筑结构加固工程中。该项目研究了不同龄期、不同温度对水泥基灌浆料力学性能的影响,利用马费炉进行高温试验,利用YA-300液压试验机进行力学性能试验,探索了高温后水泥基灌浆料的表观特征、质量损失率、抗折强度和抗压强度的变化规律。研究结果表明,在同一龄期下,随着温度的升高,水泥基灌浆料颜色变化为:青灰色-灰褐色-深灰色-黄褐色,其质量损失率随之增大,其抗折强度、抗压强度均呈下降趋势,其中抗折强度退化更为严重;在同一温度下,随着龄期的增加,水泥基灌浆料的质量损失率呈先增大后减小的趋势,其抗折强度、抗压强度均呈上升的趋势。

Cement based grout is widely used in the connection of fabricated components and the reinforcement of building structures because of its high strength and non shrinkage.The effects of different ages and temperatures on the mechanical properties of cement-based grout were studied,the high temperature test was carried out by muffle furnace and the mechanical property test was carried out by testing machine,the changes of apparent characteristics,mass loss rate,flexural strength and compressive strength of cement-based grout were explored after high temperature.The results show that at the same age,with the increase of temperature,the color of grouting material changes as follows:from cyan grey,grayish brown,dark gray to yellowish-brown,its mass loss rate increases,its flexural strength and compressive strength show downward trend,and the degradation of flexural strength is more serious.At the same temperature,with the increase of age,the mass loss rate of grouting material increases first and then decreases,and its flexural strength and compressive strength decrease.