The present paper summarises recent achievements and challenges discovered in the field of sample preparation and micromechanical characterisation of early aged Portland cement paste hydrated for 24 hours. Specimen preparation to preserve the weak and fragile microstructure (result of the low degree of hydration), and measures to identify and prevent restart of hydration on specimen surface during nano/micro-mechanical characterisation are discussed. It is shown that growth of hydration phases on well-polished specimen surface could occur during the nanoindentation testing period (usually from several hours to a few days), leading to erroneous/faulty test results. We also present test results of such specimens obtained using PeakForce QNM™ technique and discuss issues related to results interpretation. Peak-force tapping atomic force microscopy enables high-speed and high-resolution DMT modulus mapping of the investigated sample.
|Number of pages||9|
|Publication status||Published - 2 Dec 2018|
|Event||6th International Symposium on Nanotechnology in Construction - Hong Kong Science Park, Hong Kong, China|
Duration: 2 Dec 2018 → 5 Dec 2018
|Conference||6th International Symposium on Nanotechnology in Construction|
|Period||2/12/18 → 5/12/18|
- steel slag
- calcium silicate hydrate
- silicone rubber
Zhu, W., Howind, T., Guriyanova, S., Kummerling, B., & Seufert, S. (2018). On nano/micro-mechanical characterisation of early aged cement paste. Paper presented at 6th International Symposium on Nanotechnology in Construction, Hong Kong, China.