Title

Rate-Dependent Bonding of Steel Reinforcement in Geopolymer Concrete

Abstract

In this work, the dynamic pullout experiments with loading rates ranging from 0.1 to 100 MPa/s (0.0145 to 14.5 ksi/s) were conducted to investigate the bond behavior between the metakaolin-based geopolymer (MKG) concrete and the plain and deformed steel reinforcement. A rate-dependent bonding behavior between the MKG concrete and the steel reinforcement was observed. Using an analytical model, the effects of the dynamic properties of MKG concrete and the interfacial properties at MKG-steel interface were quantitatively characterized. The morphologies of the bonded and failed interfaces were also examined and analyzed, showing different failure mechanisms associated with varying loading rates. These results link the loading rate-dependency of the MKG-steel bonding behavior to the enhanced chemical adhesion at the MKG-steel interface.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

This project is supported by the National Science Foundation of China (No. 51379186 and 51522905) and the Zhejiang Provincial Natural Science Foundation of China (No. LR15E090001).

Keywords and Phrases

Interfacial bonding; Metakaolin-based geopolymer concrete; Rate dependency

International Standard Serial Number (ISSN)

0889-325X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 American Concrete Institute (ACI), All rights reserved.

Publication Date

01 Sep 2019

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