Date of Award

2022

Publisher

North Dakota State University

Document Type

Thesis

Degree Awarded

Master of Science (MS)

Program

Civil Engineering

Department

Civil, Construction, and Environmental Engineering

College

Engineering

Faculty Advisor

Huang, Ying

Description

Carbon nanotubes (CNT) have excellent electromechanical properties and can be added into cement using appropriate dispersive means to produce CNT-modified cement-based smart materials (CNTCS). This study investigates how the ingredients, W/C ratio and dispersion methods influence the sensing ability of the smart concrete. Three different dispersion methods were investigated: direct mixing, surfactant surface treated with NaDDBS, and the Carboxymethyl cellulose (CMC) surface modification. CMC surface modification method showed consistency for modified cement paste and cement-sand composite material. For CMC surface treatment method, 0.6 w/c ratio was found to be optimal compared to 0.4 and 0.5. Coarse aggregate was added with cement and sand for 0.6 w/c ratio, and consistent piezo electric response was observed under dynamic loading for CMC surface treated smart concrete. However, significant reduction of sensitivity was observed between the CMC surface treated CNT modified smart concrete compared to smart cement-sand composite and the smart cement paste.

Rights

NDSU policy 190.6.2

Rights Link

https://www.ndsu.edu/fileadmin/policy/190.pdf

Handle Identifier

https://hdl.handle.net/10365/33500

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