【摘 要】
：
Results concerning the influence of cellulose ethers on the hydration of two main cement phases-alite and tricalcium aluminate were presented.The investigat
【机 构】
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Institute of Ceramics and Building Materials, Division of Glass and Building Materials,Cementowa 8,
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
Results concerning the influence of cellulose ethers on the hydration of two main cement phases-alite and tricalcium aluminate were presented.The investigations covering the influence of this admixture on the hydration process of tricalcium aluminate indicated that methylcellulose addition inhibits hydration process of C3A with water.Similar effect of methylcellulose was found in the case of C3A hydration in the presence of gypsum.A lot of gypsum is remaining in the reaction mixture.Little amounts of ettringite are formed, while no monosulfate is created.Also in the hydration examinations of tricalcium silicate the methylcellulose caused retardation of alite reaction with water.In the first hydration hours of alite with MC addition there were no peaks of portlandite in the XRD pattern.The influence of methylcellulose addition on the hydration course is significantly weaker in the presence of gypsum.The investigations confirmed authors experience concerning hardened cement mortars (adhesives), in which high amounts of unreacted gypsum due to the formation of methylcellulose layer on its crystals were found.
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