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本文研究了 C_4AF 在石膏和碱溶液(INKOH)中早期水化和凝结的性能,测定了水化的放热速率、结合水量和总体积减缩量,用圆锥形塑性计测量了浆体的塑性强度发展。用DTA、XRD和IR鉴定了水化产物。 实验结果表明C_4AF 的水化速率虽然比C_3A 慢,但却远快于C_3S,凝结亦相当快。当加入的石膏量少于5％时,可以明显地延缓C_4AF的水化,但却不能缓凝,相反,加速了凝结。至于在INKOH溶液的作用下,C_4AF的早期水化和凝结都可延缓,但却加速后期水化。 本文证实了C_4AF是水化快且强度发展亦快的胶凝矿物,并探讨了石膏对C_4AF早期水化作用的影响。 在分析了水化产物后,作者认为INKOH溶液延缓C_4AF 水化和凝结的原因,可以归结为在C_AF颗粒表面生成了Fe(OH)_3凝胶,阻止进一步水化。当同时存在石膏时,钙矾石仍是唯一稳定的起始生成物,但当碱含量增多时,钙矾石将遭破坏。
This paper studied the early hydration and condensation properties of C_4AF in gypsum and alkali solution (INKOH). The exothermic rate of hydration, the amount of combined water, and the total volume decrease were measured. The plasticity of the slurry was measured using a conical plasticity meter. Strength development. Hydration products were identified using DTA, XRD, and IR. The experimental results show that although the hydration rate of C_4AF is slower than that of C_3A, it is much faster than that of C_3S, and the condensation rate is quite fast. When the amount of gypsum added is less than 5%, the hydration of C_4AF can be significantly retarded, but it does not retard, but instead accelerates the coagulation. As for the INKOH solution, the early hydration and condensation of C_4AF can be delayed, but it accelerates late hydration. This article confirms that C_4AF is a gelling mineral with rapid hydration and rapid strength development, and explores the effect of gypsum on the early hydration of C_4AF. After analyzing the hydration products, the authors believe that the INKOH solution delays the hydration and condensation of C_4AF, which can be attributed to the formation of Fe(OH)_3 gel on the surface of C_AF particles, preventing further hydration. When there is a simultaneous presence of gypsum, ettringite is still the only stable starting product, but when the alkali content increases, ettringite will be destroyed.