磨细循环流化床粉煤灰-石灰的水化特性

为直观准确分析循环流化床（CFB）粉煤灰的火山灰反应活性，本文通过设计CFB粉煤灰-石灰（8:2）二元体系，采用水化热、XRD和SEM-EDS等测试手段，探讨不同磨细CFB粉煤灰的水化特性及力学性能变化规律。结果表明：粉磨细化有利于CFB粉煤灰火山灰反应的进行，促进其水化产物生成、微结构的优化，从而提高其胶凝材料的力学性能，且粉磨细化程度越高，效果越明显。超细循环流化床粉煤灰具有较快的火山灰反应速率，水化产物以棒状钙钒石（AFt）、无定形C-S-H凝胶和Ca(OH)2等为主，浆体结构较为致密，其早、后期强度比未经磨细的CFB粉煤灰高出2.4 MPa、3.0 MPa，超细化处理的CFB粉煤灰表现出优异的火山灰活性及水化反应能力。

Study on hydration characteristics of grinding circulating fluidized bed fly ash-lime

In order to intuitively and accurately analyze the pozzolanic reactivity of circulating fluidized bed (CFB) fly ash, this paper explored the hydration characteristics and mechanical properties of CFB fly ash with different particle size in CFB fly ash-lime (8:2) binary system by hydration heat, XRD and SEM-EDS, etc. The results showed that the grinding refinement was conducive to the pozzolanic reaction of CFB fly ash, thus promoting the generation of hydration products and the optimization of microstructure in binary system, result in the improving of mechanical properties. The optimization effect became more significant as the grinding degree increased.. The UCFA system has a faster pozzolanic reaction rate and the hydration products are mainly rod-like AFt, amorphous C-S-H gel, and Ca(OH)2. The dense microstructure of the hardened paste resulted in earlier and later strengths being 2.4 MPa and 3.0 MPa higher than the unground CFB fly ash system, respectively. The ultra-fine processing CFB fly ash showed excellent pozzolanic activity and hydration reaction ability.