Abstract
This work focuses on mechanical properties of some phases of cement-based materials, portlandite (CH), calcite and clinker. Nano-indentation experiment is done on CSM instrument to verify the values of these cement pastes, Young moduli obtained by the averaged experimental load-depth curve is close to other references. The results show that: 1) the Young’s modulus of CH averaged by nano-indentation experiment is 39.88GPa, which is in relative good agreement with the 40.30GPa by Constantinides, 36.00GPa by Acker and 45.95GPa by Laugesen. 2) By nano-indentation experiment, elastic moduli of CH, LD C-S-H, HD C-S-H, limestone filler and clinker are separately within the region of 38.8-50.6 GPa, 17.1-27.6GPa, 30.54-36.50 GPa, 79.8-90.6GPa and 94.26-114.18GPa. The elastic moduli are determined by experiment and the SEM image of these phases are verified, which is used to describe the microstructure and mechanical properties of this typical phases in cement paste.
Highlights
Structural concrete is composed of cementitious composites and concrete performance is related with cementitious composites structural mechanics at different length-scales[1]
The elastic moduli are determined by experiment and the SEM image of these phases are verified, which is used to describe the microstructure and mechanical properties of this typical phases in cement paste
During data processing of B-CEM(III) sample, we focus on the analysis of hardness range of hydration products, the unhydrated particles will not be considered in statistics
Summary
Structural concrete is composed of cementitious composites and concrete performance is related with cementitious composites structural mechanics at different length-scales[1]. A large experimental nano-indentation campaign has been led to obtain a data basis of Young's modulus for the various phases of several cement pastes. These results may be used to validate the modeling approaches developed by the authors in previous publications. There are some reports on mechanical properties of cement phases, these reports basically focus on microstructure or qualitative analysis, and its experimental systematic research on CH, calcite and clinker at nanometers has not yet been studied. Results enable to provide elastic modulus of cement phases for the Multi-Scale Modelling of Computational Concrete platform [2,5]
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