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Mechanical performance of carbon nanotubes reinforced cement composites based on interface modification(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年02期
Page:
19-26
Research Field:
道路工程
Publishing date:

Info

Title:
Mechanical performance of carbon nanotubes reinforced cement composites based on interface modification
Author(s):
HE Rui;  YANG Zhe;  ZHANG Jiali;  CHEN Huaxin
(School of Materials Science and Engineering, Changan University, Xian 710061, Shaanxi, China)
Keywords:
road engineering;  carbon nanotube;  cement composite;  bridging agent;  mechanical property
PACS:
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DOI:
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Abstract:
Aiming at the technical problems of weak bonding capacity of interface between carbon nanotubes and cement substrate in carbon nanotubes reinforced cement composites. Polyvinyl alcohol and polyacrylamide were used as interfacial bridging agents to investigate the effect of bridging agents on the mechanical properties of carbon nanotubebased cement composites by strengthening the interface between the carbon nanotubes and the cement matrix, Arabic gum was used as waterbased dispersant for carbon nanotubes. Five kinds of cementbased composites with different amounts of carbon nanotubes were prepared by using two kinds of carbon nanotubes with common and surface carboxyl groups. Different ages compressive, flexural strength of specimens were tested. The microstructure of the interfacial region of carbon nanotubes and cement was analyzed by scanning electron microscopy (SEM) at the fracture site. The results show that the mechanical strength of cementbased composites with carbon nanotubes and bridging agents is maximized. The 28day flexural strength and compressive strength of the carboxy nanotube cement composites added with bridging agent are 47.4% and 22.7% higher than those of the same group without the addition of carbon nanotubes. The 28day flexural strength and compressive strength of the carboxy nanotube cement composites are 15.4% and 8.84% higher than baseline group. The SEM test found that the carbon nanotubes and the cement matrix are closely connected at the fracture site of the carbon nanotubes cementmatrix composite material added with the bridging agent, while the carbon nanotubes at the fractures of the specimens without the bridging agent are completely pulled out.This shows that the bridging agent improves the bonding between the carbon nanotubes and the cement matrix, so that the two are approximately subjected to a force. The pullout effect of carbon nanotubes is enhanced, more damage can be absorbed by the carbon nanotubes when the cement matrix is broken, and the macromechanical properties of the cement matrix composites are significantly improved. 2 tabs, 10 figs, 23 refs.

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Last Update: 2019-04-01