Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Research on Performance Deterioration of Multi-walled Carbon Nanotube-lithium Slag Concrete under the Coupling Effect of Sulfate Attack and Dry-wet Cycles

Version 1 : Received: 27 April 2023 / Approved: 28 April 2023 / Online: 28 April 2023 (11:12:21 CEST)

A peer-reviewed article of this Preprint also exists.

Zhang, Y.; Qin, Y.; Guo, Z.; Li, D. Research on Performance Deterioration of Multi-Walled Carbon Nanotube–Lithium Slag Concrete under the Coupling Effect of Sulfate Attack and Dry–Wet Cycles. Materials 2023, 16, 5130. Zhang, Y.; Qin, Y.; Guo, Z.; Li, D. Research on Performance Deterioration of Multi-Walled Carbon Nanotube–Lithium Slag Concrete under the Coupling Effect of Sulfate Attack and Dry–Wet Cycles. Materials 2023, 16, 5130.

Abstract

Sulfate attack is one of the main factors affecting the durability of concrete structures. In recent years, multi-walled carbon nanotubes (MWCNTs) have attracted the attention of scholars for their excellent mechanical properties and durability performance. In this paper, the influence of sulfate attack and dry-wet cycles on the performance of multi-walled carbon nanotube-lithium slag concrete (MWCNTs-LSC) with varied MWCNTs content (0wt%, 0.05wt%, 0.10wt% and 0.15wt%) and varied water-cement ratios (0.35, 0.40 and 0.45) were investigated. Besides, scanning electron microscopy (SEM) and X-ray computed tomography (CT) tests were conducted to analyze the microstructure and pore structure of the concrete. The results show that concrete incorporated with MWCNTs could effectively mitigate sulfate attack The resistance to sulfate attack of concrete is negatively related to the water-cement ratio when the dry-wet cycle is fixed. The MWCNTs-LSC showed the best compressive strength at the water-cement ratio of 0.35 and 0.10 wt% MWCNTs. The SEM test results showed that the MWCNTs both filled the pores and cracks within the specimen and formed bridges between the cracks, enhancing the resistance to sulfate attack. The CT test results also showed that the addition of MWCNTs could reduce the porosity of concrete, refine the pore size and inhibit the generation and development of cracks, thus optimizing the internal structure of concrete and improving its resistance to sulfate attack.

Keywords

MWCNTs concrete; dry-wet cycle; sulfate attack; pore deterioration; X-CT scanning

Subject

Engineering, Civil Engineering

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