Prediction Model and Mechanism for Drying Shrinkage of High-Strength Lightweight Concrete with Graphene Oxide

• Main Authors: Xiaojiang Hong, Xiaojiang Hong, Jin Chai Lee, Jin Chai Lee, Jing Lin Ng, Jing Lin Ng, Muyideen Abdulkareem, Muyideen Abdulkareem, Zeety Md Yusof, Zeety Md Yusof, Qiansha Li, Qiansha Li, Qian He, Qian He
• Format: Article
• Language: English
• Published: Mdpi 2023
• Subjects: T Technology (General)
• Online Access: http://eprints.uthm.edu.my/10024/1/J16091_1a5b1a8b7dd277dfdc559f41d422a754.pdf; http://eprints.uthm.edu.my/10024/; https://doi.org/10.3390/nano13081405

The excellent performance of graphene oxide (GO) in terms of mechanical properties and durability has stimulated its application potential in high-strength lightweight concrete (HSLWC). However, more attention needs to be paid to the long-term drying shrinkage of HSLWC. This work aims to investigate the compressive strength and drying shrinkage behavior of HSLWC incorporating low GO content (0.00–0.05%), focusing on the prediction and mechanism of drying shrinkage. Results indicate the following: (1) GO can acceptably reduce slump and significantly increase specific strength by 18.6%. (2) Drying shrinkage increased by 8.6% with the addition of GO. A modified ACI209 model with a GO content factor was demonstrated to have high accuracy based on the comparison of typical prediction models. (3) GO not only refines the pores but also forms flower-like crystals, which results in the increased drying shrinkage of HSLWC. These findings provide support for the prevention of cracking in HSLWC.