Application of the nanoindentation method in assessing of properties of cement composites modified with silica-magnetite nanostructures

Elzbieta Horszczaruk,Roman Jedrzejewski,Ewa Mijowska,Jolanta Baranowska,I Hager,T Tracz

doi:10.1051/matecconf/201816302002

Elzbieta Horszczaruk, Roman Jedrzejewski + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201816302002

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Abstract

The results of investigation of the cement composites modified with 5% of silica-magnetite nanostructures of the core-shell type are presented in the paper. The nanoindentation method employing three-sided pyramidal Berkovich indenter was used in the research. The mechanical properties and microstructure of the modified cement composites were evaluated on the basis of the values of hardness and indentation modulus measured inside the cement matrix and in the aggregate-paste interfacial zone. The results were compared with those obtained for the reference composites without nanostructures. The positive influence of the presence of silica-magnetite nanoparticles on the tested properties was found out.

Highlights

New testing techniques have been efficiently used for the control of properties and durability of the cement-based materials, the cement composites modified with addition of various types of nanoparticles
In the composite with nanoparticles admixture (N5), the hardness in the aggregate-paste contact zone was by 13% higher and inside the cement matrix by 29% higher than in the reference material (R)
The indentation modulus in the N5 composite was by 22% higher in the transition zone and by 37% higher inside the cement matrix, as compared to the reference sample (Fig. 3)

Summary

Introduction

New testing techniques have been efficiently used for the control of properties and durability of the cement-based materials, the cement composites modified with addition of various types of nanoparticles. The basic difficulty in verification of the values of elasticity modulus and hardness of the cement composites, obtained using the nanoindentation method, is the proper selection of the scale of lattice, pressing force and type of indenter. The authors of [7] have observed the high variability of the obtained results of measurements of the elasticity modulus for the phases of the cement paste.

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