【摘要】 针对天然火山岩粉早期活性低的缺点,利用不同化学试剂进行单掺优选、正交复合的试验方案,配合X射线衍射及扫描电子显微镜的微观分析,揭示化学复合激发对火山岩粉胶凝体系活性的影响规律和提升机理.结果表明,化学试剂单掺和复合掺加均能提升火山岩粉胶凝体系的活性,且7 d龄期活性指数表现最佳,试剂单掺最大可提升活性指数至73%,正交试验确定由6%CaO+2%CaCO₃+2%CaSO₄·2H₂O的试剂复合可使7 d龄期活性指数提升至85%,微观水化产物测试发现化学复合激发促使胶凝体系早期Ca（OH）₂向高硫型水化硫铝酸钙（AFt）转换的速率加快,使早期胶凝体系内部C-S-H凝胶及AFt晶体生成量增大,水化反应加速,水化产物填充作用明显,提升火山岩粉胶凝体系的早期强度.更多还原

【Abstract】 With regard to the shortcomings of low early activity of natural volcanic rock powder,we used different chemical reagents to carry out the single-doped optimization and orthogonal composite test scheme,combined with X-ray diffraction and scanning electron microscope analysis,to reveal the influence law and promotion mechanism of chemical composite excitation on the activity of volcanic rock powder cementitious system.The results showed that a single and compound addition of chemical reagents could improve the activity of volcanic powder cementitious system,and the activity index of 7 d age was the best.The maximum activity index could be increased to 73%by single doping.The orthogonal test determined that the reagent compound of 6%CaO+2%CaCO₃+2%CaSO₄·2H₂O could increase the activity index of 7 d age to 85%.Micro hydration product testing found that the conversion rate of the gelling system prompted by the discovery of the chemical compound excitation early Ca（OH）₂ to 3CaO·Al₂O₃·3CaSO₄·32H₂O（AFt） was accelerated,while the stable structure internal alkaline environment was maintained, the gelling system internal C-S-H gel and AFt crystal generation increased, hydration reaction accelerated, and the hydration product filling effect became obvious, thereby improving the early strength of the specimen.更多还原