• critical aspects of nano-indentation technique in application to hardened cement paste

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 946
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     several open questions related to the experimental protocol and processing of data acquired by the nano-indentation (ni) technique are investigated. the volume fractions of mechanically different phases obtained from statistical ni (sni) analysis are shown to be different from those obtained by back-scattered electron (bse) image analysis and x-ray diffraction (xrd) method on the same paste. judging from transmission electron microscope (tem) images, the representative volume element of low-density calcium-silicate hydrates (c–s–h) can be considered to be around 500 nm, whereas for high-density c–s–h it is about 100 nm. this raises the question how the appropriate penetration depth for ni experiments should be selected. changing the maximum load from 1 mn to 5 mn, the effect of penetration depth on the experimental results is studied. as an alternative to the sni method, a “manual” indentation method is proposed, which combines information from bse and atomic-force microscopy (afm), coupled to the ni machine. the afm allows to precisely indent a high-density c–s–h rim around unhydrated clinkers in cement paste. yet the results from that technique still show a big scatter.

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