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针对富水充填材料的凝结性能受石膏种类影响的问题,采用X射线衍射、扫描电镜、红外光谱等微观实验,分析富水充填材料硬化体的组成,探讨二水石膏和半水石膏对富水充填材料性能影响的机理.结果表明:以硫铝酸盐水泥-石膏-石灰为主的富水充填材料体系中,为保证正常的凝结硬化,石膏应为二水石膏;如以半水石膏为原材料,在7 d龄期时仍不具有强度;二水石膏充足时生成的钙矾石晶体呈细针状,二水石膏不足时生成的钙矾石晶体为六棱短柱状;富水充填材料的强度主要来源于硫铝酸盐水泥-石膏-石灰反应生成的钙矾石,而不是水泥自身水化的水化硫铝酸钙、铝胶和氢氧化钙.
In view of the problem that the coagulation performance of water-rich filling material is affected by the type of gypsum, the composition of hardened body of water-filled filling material is analyzed by microscopic experiments such as X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The effects of gypsum and hemihydrate gypsum on water- The results show that in the system of water-rich filler material, which is mainly composed of sulphoaluminate cement-gypsum-lime, gypsum should be dihydrate gypsum, in order to ensure normal condensation and hardening, The raw materials did not have strength at the age of 7 d. The ettringite crystals formed when the gypsum was abundant were fine needle-shaped, and the ettringite crystals formed when the dihydrate gypsum was insufficient were hexagonal short columns. The water-rich filling material Is mainly derived from ettringite formed by sulphoaluminate cement-gypsum-lime reaction rather than hydrated calcium sulphoaluminate cement, aluminum cement and calcium hydroxide of cement itself.