关键词: 石灰粉煤灰, 外加剂, 强度, 机理, X光衍射, 扫描电镜

Abstract: As lime-flyash mixture , a kind of semi-rigid base course material used in highway engineering , has usually very low early strength, its application is confined .The paper studies on low active lime-flyash mixture strength properties with different additives at different ages.Through X-ray diffractometer and scan electron microscope tests, the mechanism of low active lime-fly ash mixture strength with additives is studied.The results show that early strength of lime-flyash mixture can be significantly improved with adding Na2SO4 and Na2CO3, late strength of lime-flyash mixture with Na2SO4 is super to Na2CO3 , where as early and late strength of lime-flyash mixture with Portland cement is weak.

Key words: lime-flyash, additives, strength, mechanism , X-ray diffractometer , scan electron microscope