Effect of CNT-COOH Addition on the Compressive Strength, Chloride Resistance, and Microstructure of Cement Mortar

Author:

Wang Xiaofan1ORCID,Shi Yao2,Pei Xueyang1,Cui Lipeng3,Zhu Hua1ORCID

Affiliation:

1. College of Civil Engineering, Yancheng Institute of Technology, Yancheng 221051, China

2. CCCC Second Harbour Engineering Company Design & Research Institute Co. Ltd, Wuhan 430040, China

3. The First Project of the China Railway Construction Group Limited, Taiyuan 030024, China

Abstract

This work evaluated the effect of multiwalled carboxyl carbon nanotube (CNT-COOH), upon cement mortar. In order to obtain a homogeneous suspension, the CNT-COOH was dispersed in distilled water, and it then underwent an ultrasonication treatment. Samples of cement mortar were prepared with varying the additions of this suspension at 0.01%, 0.05%, and 0.10% by weight of the cement. These samples were tested in compression and for chloride migration in terms of diffusion coefficient. An increase in the CNT-COOH content led to an increase in the compressive strength. While there was an increase in the chloride diffusion coefficient up to 0.05% weight fraction, higher dosage led to a drop in the chloride diffusion coefficient with a further increase in the compressive strength. Using mercury intrusion porosimetry (MIP), it is shown that at a weight fraction of 0.10%, CNT-COOH effects a pore-size refinement by eliminating macropores (≥50 nm) and a 34% reduction in porosity. The (scanning electron microscopy) SEM and (X-ray diffraction) XRD analyses confirm that CNT-COOH leads to mature hydration products, nucleation effect, and a refined microstructure.

Funder

Yancheng Institute of Technology

Publisher

Hindawi Limited

Subject

General Engineering,General Materials Science

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