摘要
研究了用碱激发磷渣–粉煤灰胶凝材料(alkali activated phosphor slag fly ash cement,AAPFC)制备的混凝土的力学性能和耐久性,并用扫描电子显微镜观察了形成的水泥石与骨料的界面结构。结果表明:相对于硅酸盐水泥混凝土,AAPFC混凝土具有强度高,弹性模量较低的特点;其抗冻性和抗氯离子渗透性显著优于硅酸盐水泥混凝土,但抗碳化性不及后者。硅酸盐水泥混凝土中水泥石与骨料界面上存在大量定向排列的Ca(OH)2,造成弱结合,而AAPFC混凝土中水泥石与骨料间结合紧密。
The mechanical properties and durability of alkali activated phosphor slag fly ash cement （AAPFC） concrete were investi-gated, and the interface structures between the hardened cement paste and aggregate were observed by scanning electron microscope （SEM）. The results show that the compressive strengths of the AAPFC concrete are higher and the static elastic moduli are lower than those of the Portland cement concretes with the similar water to cement ratios; the frost-resistance and chloride impermeability of the AAPFC concrete are much better than those of the Portland cement concrete, while the AAPFC concretes are much more susceptible to carbonation. The SEM observation shows that there exists an oriented arrangement of Ca（OH）2 crystals at the interface between the hardened Portland cement paste and aggregate, which weaken the bond between the hardened cement paste and aggregate, but there is no such a weak bond existing in the AAPFC concretes.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第7期1235-1238,共4页
Journal of The Chinese Ceramic Society
关键词
碱-磷渣-粉煤灰胶凝材料
混凝土
力学性能
抗冻性
氯离子渗透性
碳化
alkali activated phosphor slag fly ash cement
concrete
mechanical properties
frost-resistance
chloride impermeability
carbonation
