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    Volume 6, Issue 1

    Effective Surface Preparation Technique for Cementitious Samples in Nanoindentation Testing

    (Received 16 May 2016; accepted 22 November 2016)

    Published Online: 2017

    CODEN: ACEMOAD

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    Abstract

    The nanomechanical properties of cementitious materials determined by nanoindentation largely depend on the surface roughness and intrinsic material porosity of the samples. Studies have shown that high surface roughness causes an overall reduction in the measured indentation modulus and hardness. Therefore, it is important to reduce the surface roughness to a desirable value by means of polishing. However, polishing causes damage to the cement matrix. Thus, the most challenging task is to obtain a reasonable surface roughness with minimum disturbance to the microstructure of the samples. This paper discusses an effective surface preparation technique that would meet the roughness criteria for nanoindentation. With the application of Taguchi method, the optimum parameter combinations and relative contributions of various controlling factors such as force, speed, and time of polishing were determined. A second-order response surface model was developed based on signal to noise ratio to establish the relationship between the controlling factors and surface roughness. Finally, the predicted surface roughness values from both Taguchi method and response surface model were compared with the experimental values of the optimized confirmation runs and a good agreement was achieved.


    Author Information:

    Chow, PengLoy
    Department of Civil Engineering, Curtin University, Perth, WA

    Barbhuiya, Salim
    Department of Civil Engineering, Curtin University, Perth, WA


    Stock #: ACEM20160027

    ISSN:2165-3984

    DOI: 10.1520/ACEM20160027

    Author
    Title Effective Surface Preparation Technique for Cementitious Samples in Nanoindentation Testing
    Symposium ,
    Committee E56