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Raw materials & technologies, Applications

Uniaxial compression failure of hardened cement paste

Friday, 20 December 2019

The aim of a new work is to investigate the mechanical performance of hardened cement paste (HCP) under compression at the micrometre length scale.

The researchers used both experimental and numerical approaches in their investigation of hardened cement paste (HCP). Source: Hoda Bogdan – stock.adobe.com.
The researchers used both experimental and numerical approaches in their investigation of hardened cement paste (HCP). Source: Hoda Bogdan – stock....

In order to achieve this, both experimental and numerical approaches were applied. In the experimental part, micrometre sized HCP specimens were fabricated and subjected to uniaxial compression by a flat end tip using nanoindenter. During the test, the load-displacement curves can be obtained. In the modelling part, virtual micrometre sized specimens were created from digital material structures obtained by X-ray computed tomography.

Good agreement between experimental and numerical results

A computational compression test was then performed on these virtual specimens by a discrete lattice fracture model using the local mechanical properties calibrated in the authors' previous work. A good agreement is found between the experimental and numerical results.

The approach proposed in this work forms a general framework for testing and modelling the compression behaviour of cementitious material at the micrometre length scale.

The study is published in: Cement and Concrete Research Volume 126, December 2019, 105925.

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