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Influence of the Type of Cement on the Action of the Admixture Containing Aluminum Powder

机译：水泥类型对含铝粉末混合物的作用的影响

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摘要

The study of the effect of cement type on the action of an admixture increasing the volume of concrete (containing aluminum powder), used in amounts of 0.5–1.5% of cement mass, was presented. The tests were carried out on cement mortars with Portland (CEM I) and ground granulated blast-furnace slag cement (CEM III). The following tests were carried out for the tested mortars: the air content in fresh mortars, compressive strength, flexural strength, increase in mortar volume, bulk density, pore structure evaluation (by the computer image analysis method) and changes in the concentration of OH− ions during the hydration of used cements. Differences in the action of the tested admixture depending on the cement used were found. To induce the expansion of CEM III mortars, a smaller amount of admixture is required than in the case of CEM I cement. Using the admixture in amounts above 1% of the cement mass causes cracks of mortars with CEM III cement due to slow hydrogen evolution, which occurs after mortar plasticity is lost. The use of an aluminum-containing admixture reduces the strength properties of the cement mortars, the effect being stronger in the case of CEM III cement. The influence of the sample molding time on the admixture action was also found.
机译：提出了水泥型对增加混凝土（含铝粉末）的混合物作用的作用的研究，其用量为0.5-1.5％的水泥质量。测试在与波特兰（CEM I）和地面粒状高炉渣水泥（CEM III）的水泥砂浆上进行。对测试的砂浆进行了以下测试：新鲜砂浆中的空气含量，抗压强度，弯曲强度，砂浆体积增加，散装密度，孔隙结构评价（通过计算机图像分析方法）和浓度的变化 - 离子在使用过的水泥的水合过程中。发现了根据所用水泥的测试混合物的作用的差异。为了诱导CEM III砂浆的扩张，需要较少量的混合物，而不是CEM I水泥的情况。使用高于1％的水泥质量的加混合物导致迫击药物III水泥的砂浆裂缝，由于慢性慢的氢气进化，在砂浆可塑性损失后发生。含铝混合物的使用降低了水泥砂浆的强度性质，在CEM III水泥的情况下效果更强。还发现了样品成型时间对混合物作用的影响。

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