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Combined experimental and numerical study on micro-cube indentation splitting test of cement paste

机译：水泥膏微立方压痕分裂试验的组合实验性和数值研究

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The aim of this paper is to investigate the fracture performance of cement paste at micro scale by both experimental and numerical methods. Micro cubic specimens with length of 100?μm were fabricated by precision cutting, grinding and micro-dicing, and tested by splitting with a wedge tip mounted on a nano-indenter. A nominal splitting tensile strength was derived from the maximum load of the recorded load-displacement diagram to represent the global fracture performance of the fractured micro-cube. To achieve this, an analogy was made between the micro-cube indentation splitting test and the standard Brazilian splitting test. To cope with the inherent heterogeneity of this material at micro scale, for cement paste with each water/cement (w/c) ratio (0.3, 0.4 and 0.5), more than hundred micro-cube specimens were fabricated, tested and analysed using Weibull statistics. The analysis shows that the splitting tensile strength of cement paste on the micro scale is much higher than on the macroscopic scale but lower than tensile strength of distinct hydrated cement phases measured on micro or nano scale. Furthermore, higher and less scattered values of splitting tensile strength were observed for the specimens with lower w/c ratio. In parallel with the experiments, a micro-structure informed lattice fracture model was adopted to simulate the fracture process of the micro-cube under indentation splitting. The simulated results were compared with the experimental one and have a good consistency in terms of the load-displacement curve and fracture pattern. With the method presented in this paper the framework for validation of the modelling results at micro scale is created.
机译：本文的目的是通过实验和数值方法来研究微量尺度的水泥浆料的断裂性能。通过精密切割，研磨和微生化制造长度为100Ωμm的微立方标本，并通过用安装在纳米压头上的楔形尖端分裂来测试。标称分裂拉伸强度源自记录的负载位移图的最大负荷，以表示裂缝的微立方体的全局裂缝性能。为此，在微立方压痕分裂试验和标准巴西分裂试验之间进行了类比。为了应对该材料的固体刻度，对于每个水/水泥（W / C）比（0.3,0.4和0.5）的水泥浆料，使用Weibull制造，测试和分析了超过一百个微立方标本统计数据。分析表明，微秤上的水泥浆的分裂拉伸强度远高于宏观刻度，但低于在微型或纳米级测量的不同水合水泥相的拉伸强度。此外，对于具有较低W / C比率的试样，观察到较高且较少的分裂拉伸强度的值。与实验并联，采用微结构通知的晶格裂缝模型来模拟压痕分裂下微立方的断裂过程。将模拟结果与实验结果进行比较，并且在负载 - 位移曲线和裂缝图案方面具有良好的一致性。使用本文中提出的方法，创建了用于验证Micro Scale的建模结果的框架。

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