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Open AccessArticle

A Comparative Study on the Effects of Three Nano-Materials on the Properties of Cement-Based Composites

by Chao Fu 1, Chunyan Xie 1, Jing Liu 1, Xiuli Wei 2 and Dake Wu 1,*
1
College of Engineering and Technology, Southwest University, Chongqing 400715, China
2
Chongqing Academy of Agricultural Sciences, Chongqing 401329, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 857; https://doi.org/10.3390/ma13040857
Received: 15 January 2020 / Revised: 9 February 2020 / Accepted: 11 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue Advanced Fiber-Reinforced Concrete Composites)
The application of nano-materials to modify construction materials has become a research hotspot in recent years, but often different scholars use different research methods and reach different conclusions about the same material, which is not conducive to the performance comparison between different materials. In this paper, nano-SiO2, carbon nanotubes (CNTs) and nanocrystalline cellulose (NCC) were used as raw materials to prepare cement-based composites to compare the effects of the three nanomaterials on the mechanical and water absorption properties under the same experimental conditions, and their principles were investigated via The scanning electron microscope (SEM), X-Ray Diffraction (XRD) and other microscopic analysis testing methods. At the same time, strength benefit indexes are introduced to comprehensively evaluate the economics of the strength improvement provided by the three kinds of nanomaterial. The results show that doping with nano-SiO2, CNTs and NCC can promote the hydration process of cement effectively. The composite material exhibits excellent mechanical properties at the macro level because of the nucleation and filling effect of nano-SiO2, and the bridging and strengthening effects of CNTs and NCC. The compressive strength increased by 45.13%, 28.31% and 44.19% at 7d, and 23.09%, 18.40% and 23.40% at 28d. The flexural strength of 7d increased by 31.00%, 36.22 and 54.81%, and 14.91%, 22.23% and 30.46% at 28d. The water absorption is SiO2 < NCC < CNTs, and the nano-SiO2 is lower than the other two materials at least 15.54%. CNTs group has the lowest compressive strength benefit, which is 16.91 yuan/m3, and the lowest flexural strength benefit is NCC, which is 3.59 yuan/m3. View Full-Text
Keywords: nanomaterials; cement-based composites; mechanical properties; strength benefit nanomaterials; cement-based composites; mechanical properties; strength benefit
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Fu, C.; Xie, C.; Liu, J.; Wei, X.; Wu, D. A Comparative Study on the Effects of Three Nano-Materials on the Properties of Cement-Based Composites. Materials 2020, 13, 857.

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