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采用纳米原位压痕手段测量硬化水泥净浆中单一相态的代表性微观力学性能,并采用纳米点阵压痕研究各相态的含量。研究对象囊括水灰比为0.3、0.4、0.5的纯水泥净浆和水灰比为0.3情况下含50%、70%矿渣掺量复合体系,共5种配比,以表征它们的相态分布和微观力学性质的异同点。掺矿渣的试件中含有明显多的复合相,因此提出三相模型测算复合相中未水化物的体积分数。此外,提出基于纳米压痕技术计算纯水泥和掺矿渣水泥试件水化程度的方法,结果吻合于热重分析的结果,其中纯水泥净浆中复合相较少,计算得到的水化程度优于对掺矿渣水泥试件的计算。
Nanocomposite indentation was used to measure the microscopic mechanical properties of the single phases in the hardened cement paste. The nano-lattice indentation was used to study the content of each phase. The research object includes the pure cement paste with a water-cement ratio of 0.3, 0.4 and 0.5, and a composite system containing 50% and 70% of the slag content in a water-cement ratio of 0.3, in total of 5 kinds of formulations to characterize their phase distribution Similarities and differences between micro and mechanical properties. The slag-doped specimen contains significantly more composite phases. Therefore, a three-phase model is proposed to calculate the volume fraction of unhydrated compounds in the composite phase. In addition, a method of calculating the degree of hydration of pure cement and slag-mixed cement specimens based on nano-indentation technique is proposed. The results are in good agreement with the results of thermogravimetric analysis, in which the pure cement paste has less composite phases and the calculated degree of hydration In the calculation of slag-doped cement specimens.