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在水泥中掺入适当种类的水硬性混合材料,能改善水泥抗硫酸盐的性能。但由于混合材料的种类不同,其中含活性Al_2O_3有多有少,这对于改善水泥的抗硫酸盐性能,有一定的影响。要测定混合水泥的抗硫酸盐性能,单独采用石灰吸牧、石灰胶砂、可溶矽酸、可溶铝酸等办法,都不能直接得到完满的结果。因而过去测定这项性能,都是采用:将混合材料与水泥熟料磨细后,按混合材料占20%、30%……等不同配比,用1∶2软练胶砂制成4×4×16厘米的试体(或用1∶3.5胶砂制成1×1×3厘米试体),然后将试体放在10%的Na_2SO_4溶液中浸蚀,或放在清水中养护,按1个月、3个月、6个月三个期龄,试验试体的强度,将浸于Na_2SO_4中制体的强度与放年清水中养护试体的强度比较得出一个系数,用这系数来评价
The incorporation of appropriate types of hydraulically mixed materials in the cement improves the sulfate resistance of the cement. However, due to the different types of mixed materials, which contain more or less active Al2O3, this has some effect on improving the sulfate resistance of cement. To determine the sulfate resistance of mixed cements, lime grazing, lime mortar, soluble tannins, soluble aluminates, etc. alone cannot achieve complete results directly. Therefore, in the past, the determination of this property was performed by grinding the mixed material and the cement clinker, and then using the mixed material to account for 20%, 30%, etc. of different proportions, and using a 1:2 soft rubber sand to make 4× 4 x 16 cm specimens (or 1 x 1 x 3 cm specimens made of 1:3.5 glue sand) and then immersed in 10% Na_2SO_4 solution or maintained in clean water, press In the three-month ages of 1 month, 3 months, and 6 months, the strength of the test specimens was determined by comparing the strength of the bodies immersed in Na 2 SO 4 with the strength of the curing specimens in the fresh water. To evaluate