Effects of Multi-Walled Carbon Nanotubes and Recycled Fine Aggregates on the Multi-Generational Cycle Properties of Reactive Powder Concrete

Heng Wu, Xibin Liu, Xirui Ma and Guifeng Liu ()
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Heng Wu: School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
Xibin Liu: School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
Xirui Ma: School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
Guifeng Liu: School of Urban Construction, Changzhou University, Changzhou 213164, China

Sustainability, 2024, vol. 16, issue 5, 1-17

Abstract: In order to investigate the effect of multi-walled carbon nanotubes (MWCNTs) on the recyclable properties of multi-generation recycled concrete, the physical properties of multi-generation recycled fine aggregate and the mechanical properties of multi-generation recycled concrete with different dosages of MWCNTs were tested, and the enhancement mechanism was analyzed by scanning electron microscopy (SEM). The results showed that the apparent density of multi-generation recycled fine aggregate with 0.05 wt% MWCNTs was increased by 1.04~2.03%, the crushing value was decreased by 38.21~49.45%, the compressive strength of the concrete prepared by it was increased by 11.11~18.96%, the splitting tensile strength was increased by 10~43.94%, the flexural strength was increased by 13.62~22.23%, and the mechanical properties were analyzed by scanning electron microscopy (SEM). Combined with the scanning electron microscope image analysis, the MWCNTs can fill the pores inside the specimen, bridge the cracks, and retard the decrease in concrete strength after multi-generation recycling.

Keywords: carbon nanotubes; multi-generational cycle of concrete; recycled fine aggregate; reactive powder concrete; mechanical properties (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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