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 P_2O_5 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. P_2O_5 at a lower content(i.e., ≤0.2%) does not affect the hydration characteristics and strength properties of alite. When the content of P_2O_5 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 P_2O_5 increases. The stabilization of R-type alite can greatly improve the compressive strength of alite.
引文
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