石灰石微粉与偏高岭土复合对水泥强度和水化产物的影响

发布时间：2018-03-20 16:15

本文选题：石灰石微粉　切入点：偏高岭土　出处：《硅酸盐学报》2017年05期 　论文类型：期刊论文

【摘要】：为探究石灰石微粉(LS)与偏高岭土(MK)在水泥中的复合效应,研究了两者以不同质量比复合对水泥砂浆强度的影响,并采用X射线衍射和热重分析研究了三元体系的水化产物。结果表明:LS与MK以1:1复合取代20%的水泥砂浆强度除3 d略低于水泥参比样外,7 d和28 d强度略高于或与参比样相当;复合取代量为30%时,LS与MK以2:1复合与以1:2比例复合,两体系3 d和7 d的强度相当,28 d时,高MK体系(LS/MK质量比为1:2)强度与参比样相当,而高LS体系(LS/MK质量比2:1)强度低于高MK体系约6 MPa;LS与MK以3:1复合取代量为40%时,体系在所研究各龄期的强度均显著降低,3、7 d和28 d强度分别为参比样的54%、55%和75%。LS与MK复合提高了水泥水化程度,强化了CaCO_3与铝质组分反应生成碳铝酸盐的化学效应,碳铝酸盐的衍射强度随龄期延长和复合体系LS的比例增加而增加。两者以适宜比例复合,可强化碳铝酸盐形成并实现与MK火山灰效应的复合,促进复合水泥不同龄期强度发展。
[Abstract]:In order to investigate the composite effect of Limestone micropowder (LS) and metakaolin (MK) in cement, the effect of different mass ratio on the strength of cement mortar was studied. The hydration products of the ternary system were studied by X-ray diffraction and thermogravimetric analysis. The results show that the strength of cement mortar with W LS and MK replacing 20% with 1: 1 is slightly higher than that of the reference sample for 7 d and 28 d except for 3 days. When the mass ratio of LS and MK is 2: 1 and that of MK is 1: 2, the strength of the two systems is equivalent to that of the reference sample when the strength of the two systems is equal to 28 d for 3 d and 7 d, and the mass ratio of LS- MK to MK is 1: 2 for the high MK system. However, the strength of the high LS / MK ratio of 2: 1 is lower than that of the high MK system (about 6 MPA / MK / MK = 40). The strength of the system decreased significantly at each age in the study. The strength of the system was 54% of the reference sample for 7 d and 28 d, respectively, and 75. LS combined with MK increased the hydration degree of cement, and strengthened the chemical effect of the reaction of CaCO_3 with the aluminum component to form aluminate. The diffractive intensity of aluminate increases with the prolongation of age and the increase of the ratio of LS in the composite system, which can strengthen the formation of aluminate and realize the compounding effect with MK pozzolanic ash, and promote the development of strength of composite cement at different ages.
【作者单位】：南京工业大学材料科学与工程学院;
【基金】：国家自然科学基金(51472116)资助项目
【分类号】：TQ172.1

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