发泡水泥力学性能测试及管道保温试验研究

Experiment on Mechanical Properties of Foamed Cement and Pipeline Insulation

通过调整双氧水比例控制发泡量得到不同密度的发泡水泥,研究不同密度下发泡水泥的导热系数和力学性能变化规律并将其应用于高温管道外侧进行材料耐高温及保温性能试验研究。结果表明,随着密度的增大,导热系数和吸水率数值变化不大,抗压强度和抗折强度增大,抗冻性能增强。导热系数随温度变化规律,85℃以下基本不变,85~150℃增大并有波动,150℃以上增大明显,并且其数值随着时间推移明显减小。研究结论可为发泡水泥在高温管道的保温推广应用提供理论依据。

By adjusting the ratio of hydrogen peroxide to control the foaming amount,different densities of foamed cement were obtained.The thermal conductivity and mechanical properties of foamed cement under different densities were studied and applied to the outside of high temperature pipeline for high temperature resistance and thermal insulation performance test.The results showed that with the increase of density,the thermal conductivity and water absorption had little change,the compressive strength and flexural strength gradually increase,and the frost resistance was enhanced.The thermal conductivity was basically unchanged below85 ℃,the thermal conductivity increased and fluctuated between 85 ℃ and 150 ℃,and the thermal conductivity increased significantly above 150 ℃.Its value decreased obviously with time.The conclusion could provide a theoretical basis for the expansion and application of foamed cement in high-temperature pipeline insulation.