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采用纳米压痕实验量测硬化水泥净浆中未水化物、水化产物和孔隙等微观物相的力学性质,并基于背散射电镜图像的灰度分析计算各微观物相的含量。在得到各微观物相含量和力学性质的基础上,针对水泥净浆的弹性模量进行均一化建模,并讨论各微观物相及其模量的选取对跨尺度模拟硬化水泥净浆力学性质的影响。通过微米压痕的实测净浆模量验证模型及参数选取的可靠性。提出在硬化水泥净浆力学性质的多尺度模型中,需要选取12GPa作为孔隙有效模量,并将水化产物划分为低密度的CSH凝胶和高密度的CSH凝胶两种物相,而不同种类的未水化物可以被视作一种物相。在此基础上,使用Mori-Tanaka模型或自洽模型计算得到的净浆模量与实测净浆模量吻合。
The nano-indentation experiment was used to measure the mechanical properties of the non-hydrated, hydrated and pore-like microstructures in the hardened cement paste. The content of each microscopic phase was calculated based on the grayscale analysis of backscattered electron microscopy images. On the basis of obtaining the microscopic phase content and mechanical properties, the elastic modulus of the cement paste is modeled homogeneously, and the selection of microscopic phases and their moduli is discussed. The mechanical properties of the cross-dimensionally hardened cement paste Impact. The reliability of model and parameter selection was verified by the measured net pulp modulus of micro indentation. In the multi-scale model of the mechanical properties of hardened cement paste, we need to select 12GPa as the effective modulus of the pores, and divide the hydration products into two phases of low-density CSH gel and high-density CSH gel Species of non-hydrate can be regarded as a phase. On the basis of this, the net modulus obtained by Mori-Tanaka model or self-consistent model is in good agreement with the measured net modulus.