磷掺杂对阿利特介稳结构及水化性能的影响  

Influence of Phosphorus Doping on Metastable Structure and Properties of Alite

作　　者：任雪红[1] 张文生[1] 叶家元[1] 沈晓冬[2] 马素花[2] 

机构地区：[1]中国建筑材料科学研究总院,绿色建筑材料国家重点实验室,北京100024 [2]南京工业大学,江苏先进生物与化学制造协同创新中心,南京210009

出　　处：《硅酸盐学报》2017年第8期1073-1079,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金资助项目(51302256)

摘　　要：采用X射线衍射结合Rietveld方法、红外光谱、差示扫描量热、扫描电镜及微量热分析等,研究了磷掺杂对阿利特晶体结构、多晶转变、微观形貌及水化性能等的影响。结果表明:在典型组成的阿利特中,掺1%P_2O_5(质量分数,下同)可稳定R型阿利特,但其在650~850℃介稳,向低温晶型转变。低掺量P_2O_5(≤0.2%)基本不影响阿利特水化性能。当P_2O_5掺量在准同型相界附近(0.5%)时,阿利特早期水化活性最高。随P_2O_5掺量增加,阿利特晶粒尺寸增大,早期活性降低,主水化反应减缓,但中后期活性增加。掺磷稳定R型阿利特可显著提高阿利特强度。The influence of phosphorus doping on the crystal structure, phase transformation, microstructure and hydration properties of alite was investigated by X-ray powder diffraction with the Rietveld method, differential scanning calorimetry and Fourier transform infrared spectroscopy, scanning electron microscopy and isothermal calorimetry, respectively. The results show that the P205 addition of 1% （in mass fraction, the same below） can stabilize R-type alite. However, it is unstable at 650-850 ℃, which transforms into lower temperature forms. P2O5 at a lower content （i.e., ≤0.2%） does not affect the hydration characteristics and strength properties of alite. When the content of P205 is close to the morphotropic phase boundary, alite shows the highest early hydration reactivity. The length-diameter ratio of alite and the early hydration reactivity decrease, the main hydration slows down, but the rate of hydration increases during the deceleration period when the amount of P2O5 increases. The stabilization of R-type alite can greatly improve the compressive strength of alite.

关 键 词：磷 阿利特 固溶体 多晶态 抗压强度 准同型相界 

分 类 号：TQ172.1[化学工程—水泥工业]