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. 2015 Dec 14;8(12):8780-8792.
doi: 10.3390/ma8125491.

Investigation on the Mechanical Properties of a Cement-Based Material Containing Carbon Nanotube Under Drying and Freeze-Thaw Conditions

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Free PMC article

Investigation on the Mechanical Properties of a Cement-Based Material Containing Carbon Nanotube Under Drying and Freeze-Thaw Conditions

Wei-Wen Li et al. Materials (Basel). .
Free PMC article

Abstract

This paper aimed to explore the mechanical properties of a cement-based material with carbon nanotube (CNT) under drying and freeze-thaw environments. Mercury Intrusion Porosimetry and Scanning Electron Microscopy were used to analyze the pore structure and microstructure of CNT/cement composite, respectively. The experimental results showed that multi-walled CNT (MWCNT) could improve to different degrees the mechanical properties (compressive and flexural strengths) and physical performances (shrinkage and water loss) of cement-based materials under drying and freeze-thaw conditions. This paper also demonstrated that MWCNT could interconnect hydration products to enhance the performance of anti-microcracks for cement-based materials, as well as the density of materials due to CNT's filling action.

Keywords: carbon nanotube (CNT); cement-based material; drying; durability; freeze-thaw; mechanical property.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Scanning electon microscopy (SEM) image of multi-walled CNT (MWCNT).
Figure 2
Figure 2
Flexural and compressive strengths of samples in standard curing. (a) Flexural strength; (b) Compressive strength.
Figure 3
Figure 3
SEM images of the CNT/cement composite at an age of 28 days. (a) Q1-CNT ×10k; (b) Q3-CNT ×10k; (c) Q5-CNT ×10k; (d) Q3-CNT ×30k; (e) Q3-CNT ×5k.
Figure 4
Figure 4
Pore size distribution curves of the Control and Q3-CNT specimens.
Figure 5
Figure 5
Average value of water loss rate.
Figure 6
Figure 6
Development of drying shrinkage for the control and Q3-CNT specimens. (a) Average value of daily drying shrinkage; (b) Average value of cumulative drying shrinkage.
Figure 7
Figure 7
The flexural and compressive strengths of the control and Q3-CNT specimens under drying conditions (a) Average value of flexural strength; (b) Average value of compressive strength.
Figure 8
Figure 8
Degradation in compressive strength of the control and Q3-CNT specimens under freeze-thaw (FT) cycles.

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