碱激发偏高岭土胶凝材料水化硬化机理的研究

碱激发偏高岭土胶凝材料的水化同样可以分为初始期、诱导期、加速期、减速期以及稳定期。但是,各水化阶段的反应机理与传统的水泥基材料完全不同。初始期主要是偏高岭土对溶液组分的表面吸附;诱导期主要表现为活性硅铝氧化物的溶解;加速期表现为四面体基团的聚合;减速期水化速度降低的主要原因是扩散阻力加大,同时偏高岭土反应面积减少,液相中的碱含量降低也是重要原因。

Study on hydration mechanism of alkali-activated meta-kaolin cementitious material

The hydration process of alkali-activated meta-kaolin cementatious materials can also be divided into initial,induce,accelerate,decelerate and stable stages.But the hydration mechanism of the alkali-activated meta-kaolin cementitious materials is absolutely different from that of traditional cement based material.The component of solution is absorbed by meta-kaolin in the surface at the initial stage;At induce stage,the active silicon and aluminum oxide are dissolved.the silicon-aluminum tetrahedron network structure is formed at the accelerate stage;the main reason of hydration rate reduce at decelerate stage due to increase of diffuse resistance and at the same time the reaction surface of meta-kaolin becomes smaller.The reduce of alkali in the solution is an important reason too.