本文利用硫铝酸盐水泥熟料、二水石膏、硅酸盐水泥熟料配制了三组份硫铝酸盐水泥,研究了硅酸盐水泥熟料对硫铝酸盐水泥某些性能的影响。试验结果表明,掺入适量的硅酸盐水泥熟料,对硫铝酸盐水泥某些性能有明显影响:一、提高水泥早期的抗压强度;二、可以改变水泥的热稳定性;三、调整硅酸盐水泥熟料和石膏的加入量,可以调整水泥的凝结时间和自由膨胀率。 作者利用X射线衍射分析、差热分析、电子显微镜观察、压汞测孔仪、热膨胀仪及光电比色计等方法和手段,研究了提高强度和热稳定性的原因。结果表明,加入硅酸盐水泥熟料后,减小了钙矾石结晶尺寸,降低了水泥石的孔隙率、增加了结构的密实度。 作者根据实验结果,进一步讨论了减小钙矾石结晶尺寸、增加结构密实度的原因。加入硅酸盐水泥熟料后,提高了水化液相的碱度,使得钙矾石结晶尺寸减小。关于水泥石结构的密实度,主要从水泥浆体的凝聚结构方面进行了讨论。在实验条件下,测得钙矾石的表面电性为正、水化硅酸钙的表面电性为负。由于电性相反,范德华引力与电性引力一致,增加了形成凝聚结构的力,致使形成较为致密的凝聚结构。测定水泥浆悬浮体的透光率的结果进一步证实了此结论,未加硅酸盐水泥熟料的水泥悬浮体透光率小,而加后的透光率大。在此基础上,作者提出了在凝聚结构形成过程中,应创造条件使之产生相互匹配的异性水化物的看法。 水泥热稳定性增加,作者认为与钙矾石的尺寸减小和均匀分布有密切关系。钙矾石结晶尺寸大而集中时,加热水泥石,开始受热膨胀,到达钙矾石脱水温度后,继而急剧收缩,造成较大的局部应力,破坏水泥石结构。测定水泥石热膨胀系数表明,未加硅酸盐水泥熟料的热膨胀系数大,而加后热膨胀系数减小。

Research into Influence of Portland CementClinker on the Properties of Sulfoaluminate Cement Wang HongThe author of this paper investigated some properties of the sulfoalum- inate cement which was prepared by grinding of sulfoaluminate cement clinker, gypsum and portland cement clinker. The results of testing show that the cement properties are evidently influenced by adding appropriate amount of portland cement clinker. That is the compresive strength of the early stage and thermal stabiolity of cement setting time and free-expensibility Can be adjusted by controlling the amounts of portland cement clinker and gypsum. The author studied the reasons why the compressive strength and the- rmal stability increase by means of X-ray diffraction analysis, differential theamal analysis, scanning electron microscopy, mercury penetration method, thermal expansion determination and so on. we have found out that the addition of portland cement clinker reduces the size of ettringite crystal and the porosity of hardened cement paste and increases the denseness of the cement-stone structure. The size of ettringite crystal decreases when the Ca(OH)_2concentration of hydration liquid phase in hardened cement paste increases. The denseness of the hardened cement paste is discussed from its condensing structure. The zeta potentials of ettringite crystal and calcium silicate hydrate were measured. In the case of own experiments, the former is positive, and the latter is negative. Owing to the Van der waals force and the attractive fore provided by diverse zeta potentials between ettringite and calcium silicate hydrate being identical in orientation, the condensing force increases, thus the denseness of paste structure increases. This conclusion was also confi- rmed by measuring light transmission coefficient data on cement suspensions. The result shows that portland cement clinker increases the light transmis- sion coefficient of sulfoaluminate cement early strength cement. In order to increase the density of the paste structure, the hydrates with diverse zeta potentials must be corresponded with each other during eary hydration period. The thermal stability of hardened cement pasts depends on the size and distribution of the ettringite crystals. The thermal expension coefficient data shows that portland cement clinker decreases the thermal expension coeffic- ient of sulfoaluminate cement.