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Open AccessArticle

Mechanical Properties and Durability of Ultra High Strength Concrete Incorporating Multi-Walled Carbon Nanotubes

by Liulei Lu 1,2, Dong Ouyang 1,2,* and Weiting Xu 2
1
Department of Mechanics and Civil Engineering, Jinan University, Guangzhou 510632, China
2
Research Center of Engineering Materials and Structural Durability, Jinan University, Guangzhou 510632, China
*
Author to whom correspondence should be addressed.
Academic Editor: Klara Hernadi
Materials 2016, 9(6), 419; https://doi.org/10.3390/ma9060419
Received: 5 May 2016 / Revised: 5 May 2016 / Accepted: 18 May 2016 / Published: 27 May 2016
(This article belongs to the Section Advanced Composites)
In this work, the effect of the addition of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties and durability of ultra high strength concrete (UHSC) is reported. First, the MWCNTs were dispersed by a nano sand-mill in the presence of a surfactant in water. The UHSC specimens were prepared with various amounts of MWCNTs, ranging from 0% to 0.15% by weight of cement (bwoc). Results indicated that use of an optimal percentage of MWCNTs (0.05% bwoc) caused a 4.63% increase in compressive strength and a 24.0% decrease in chloride diffusion coefficient of UHSC at 28 days curing. Moreover, the addition of MWCNTs also improved the flexural strength and deformation ability. Furthermore, a field-emission scanning electron microscopy (FE-SEM) was used to observe the dispersion of MWCNTs in the cement matrix and morphology of the hardened cement paste containing MWCNTs. FE-SEM observation revealed that MWCNTs were well dispersed in the matrix and no agglomerate was found and the reinforcing effect of MWCNTs on UHSC was thought to be pulling out and microcrack bridging of MWCNTs, which transferred the load in tension. View Full-Text
Keywords: carbon nanotubes; ultra high strength concrete (UHSC); compressive strength; chloride permeability carbon nanotubes; ultra high strength concrete (UHSC); compressive strength; chloride permeability
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MDPI and ACS Style

Lu, L.; Ouyang, D.; Xu, W. Mechanical Properties and Durability of Ultra High Strength Concrete Incorporating Multi-Walled Carbon Nanotubes. Materials 2016, 9, 419.

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