稻壳灰煅烧温度对其改性水泥砂浆性能的影响

Effect of Calcination Temperature of Rice Husk Ash on Properties of Its Modified Cement Mortar

为探究不同煅烧温度下制备的稻壳灰对水泥砂浆性能的影响,借助X射线荧光光谱分析仪(XRF)与X射线衍射分析仪(XRD)测定了不同煅烧温度下稻壳灰中无定形SiO_(2)含量,通过稻壳灰的扫描电镜(SEM)图像分析其微观结构。将制得的稻壳灰代替水泥掺入到水泥砂浆中,通过水泥砂浆力学性能实验与抗渗性实验测定稻壳灰改性水泥砂浆的力学性能与抗渗性能;结合稻壳灰的微观测试结果,分析稻壳灰煅烧温度对水泥砂浆性能的影响机理。研究结果显示:当煅烧温度超过600℃时,稻壳灰中无定形SiO_(2)向结晶相转变;随着稻壳煅烧温度的提高,稻壳灰改性水泥砂浆早期强度与抗渗性能逐渐降低,但对其后期强度没有显著影响;稻壳灰的最佳煅烧温度为600℃。

To investigate the effect of rice husk ash prepared at different calcination temperatures on the properties of cement mortar,the content of amorphous SiO_(2) in rice husk ash at different calcination temperatures was measured using X-ray fluorescence spectroscopy(XRF)and X-ray diffraction analysis(XRD).The microstructure of rice husk ash was analyzed using scanning electron microscopy(SEM)images.Substituting cement with rice husk ash,the mechanical and impermeability properties of rice husk ash modified cement mortar were determined through mechanical and impermeability tests.The influence mechanism of rice husk ash calcination temperature on the performance of cement mortar was analyzed based on the microscopic test results of rice husk ash.The research results showed that when the calcination temperature exceeded 600℃,amorphous SiO_(2) in rice husk ash transformed into crystalline phase;As the calcination temperature of rice husks increased,the early strength and impermeability of rice husk ash modified cement mortar gradually decreased,but it had no significant effect on its later strength;The optimal calcination temperature for rice husk ash was 600℃.