硅灰和粉煤灰对磷酸钾镁强度、耐水性的影响

【作者】 郭金光； 张昊； 关瑞芳； 侯鹏坤；

【机构】 济南大学材料科学与工程学院；

【摘要】 通过掺入硅灰与粉煤灰对磷酸钾镁水泥(MKPC)进行改性,系统考察其对抗压强度及耐水性能的影响,并结合X射线衍射(XRD)、热重分析(TG)和扫描电子显微镜(SEM)分析材料物相组成与微观结构演变。结果表明,硅灰和粉煤灰的引入显著改善MKPC的力学性能和耐水性。当硅灰掺量为20%(质量分数,下同)、粉煤灰掺量为10%时,28 d抗压强度分别较基准组提升18.17%和22.11%;在5%掺量下,二者对水养27 d试件的强度保留率提升效果最优,增幅分别为4.80%和5.40%。微观结构分析显示,矿物掺合料能促进胶凝体系的致密化,抑制水渗透及裂纹发展。研究表明,合理控制硅灰或粉煤灰掺量可有效协同优化MKPC的强度与耐久性,为其工程应用提供技术支撑。更多还原

【Abstract】 This study modified potassium magnesium phosphate cement( MKPC) by incorporating silica fume and fly ash,systematically investigating their effects on compressive strength and water resistance. The phase composition and microstructural evolution of the materials were analyzed using X-ray diffraction(XRD), thermogravimetric analysis(TG), and scanning electron microscopy(SEM). The results indicate that the addition of silica fume and fly ash significantly enhances the mechanical properties and water durability of MKPC. When the dosage of silica fume was 20%(by mass, as below) and fly ash was 10%,the 28-day compressive strength increased by 18. 17% and 22. 11%, respectively, compared to the control group. At a 5% dosage,both additives achieved optimal improvement in strength retention after 27 days of water curing, with increases of 4. 80% and 5. 40%, respectively. Microstructural analyses reveal that the mineral admixtures promote densification of the cementitious matrix,effectively inhibiting water penetration and crack propagation. This research demonstrates that appropriate control over the dosage of silica fume or fly ash can synergistically optimize the strength and durability of MKPC, providing technical support for its practical engineering applications.更多还原