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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 effects of phosphorus doping on Alite crystal structure, polycrystalline transformation, microstructure and hydration properties were investigated by X-ray diffraction with Rietveld method, infrared spectroscopy, differential scanning calorimetry, scanning electron microscopy and micro-thermal analysis . The results showed that Rare-type Alite doped with 1% P 2 O 5 (mass fraction, the same below) could be stabilized in Alite with typical composition, but metastable at 650-850 ℃ to low-temperature crystal form. Low content of P_2O_5 (≤0.2%) basically does not affect Alite hydration performance. When the content of P 2 O 5 is near the quasi-homogeneous phase boundary (0.5%), Alite has the highest initial hydration activity. With the increase of P2O5 content, Alite crystal grain size increased, early activity decreased, the main hydration slowed down, but in the late activity increased. Phosphorus-stabilized R-alitrex significantly enhances Alite strength.