Effects of Different Gelling Compositions on Drying Shrinkage Properties of 3D Printed Cement-Based Materials

ZHENG Jie; LUO Surong; OU Xiang; WANG Shijie

doi:10.13204/j.gyjzG23021512

Volume 53 Issue 10

Oct. 2023

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ZHENG Jie, LUO Surong, OU Xiang, WANG Shijie. Effects of Different Gelling Compositions on Drying Shrinkage Properties of 3D Printed Cement-Based Materials[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(10): 151-156,28. doi: 10.13204/j.gyjzG23021512

Citation:

ZHENG Jie, LUO Surong, OU Xiang, WANG Shijie. Effects of Different Gelling Compositions on Drying Shrinkage Properties of 3D Printed Cement-Based Materials[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(10): 151-156,28. doi: 10.13204/j.gyjzG23021512

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Effects of Different Gelling Compositions on Drying Shrinkage Properties of 3D Printed Cement-Based Materials

doi: 10.13204/j.gyjzG23021512

1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
2. Fujian Provincial Institute of Architectural Design and Research Corporation, Fuzhou 350001, China

Received Date: 2023-02-15
Available Online: 2023-12-18

Abstract

Abstract

In order to improve the drying shrinkage performance of 3D printed cement-based materials, two mineral admixtures of fly ash (FA) and mineral powder (S) were added to the 3D printed cement-based materials prepared by machine-made sand in the form of single admixture and compound admixture. Scanning electron microscope and mercury intrusion porosimetry were used to research the microstructure and pore structure of 3D printed cement-based materials. The test results showed that:in the case of single addition, lower activity of fly ash and mineral powder inhibited the development of strength, and the inhibition effect of fly ash in the X, direction was the strongest, which reduced the 28 d compressive strength and flexural strength by 41% and 23%, respectively. However, the skeleton filling effect and pozzolanic effect of mineral admixtures could improve the pore structure, reduce the connectivity between pores, reduce water consumption, and inhibit the drying shrinkage of 3D printed cement-based materials. With the same content of fly ash and mineral powder, the total porosity was reduced by 15.2% and 9.8%, and the most probable pore size was reduced by 43.2% and 16.5%. Test group with 30% fly ash and 20% mineral powder reduced the 28d drying shrinkage by 41% and 22%, respectively. When fly ash and mineral powder were paired together, compressive strength and flexural strength decreased by 27.5% and 13.9%, respectively, and the inhibition effect on drying shrinkage was between that of single admixture, reduced the 28 d drying shrinkage by 23%-25%.
- 3D printed cement-based materials,
- different gelling compositions,
- machine-made sand,
- shrinkage performance

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References(25)

References

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