Nonlinear regression models of compressive performance and pore structure of rubber aggregate alkaline mortar

SHI Yuhang; MA Qinyong; XU Zifang; MA Dongdong; HUANG Kun

doi:10.13801/j.cnki.fhclxb.20220519.002

Volume 40 Issue 4

Apr. 2023

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SHI Yuhang, MA Qinyong, XU Zifang, et al. Nonlinear regression models of compressive performance and pore structure of rubber aggregate alkaline mortar[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2321-2330. doi: 10.13801/j.cnki.fhclxb.20220519.002

Citation:

SHI Yuhang, MA Qinyong, XU Zifang, et al. Nonlinear regression models of compressive performance and pore structure of rubber aggregate alkaline mortar[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2321-2330. doi: 10.13801/j.cnki.fhclxb.20220519.002

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Nonlinear regression models of compressive performance and pore structure of rubber aggregate alkaline mortar

doi: 10.13801/j.cnki.fhclxb.20220519.002

1.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
2.
School of Material Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China

Funds: Collaborative Innovation Project of Universities in Anhui Province (GXXT-2019-005)

Received Date: 2022-04-02
Accepted Date: 2022-05-14
Rev Recd Date: 2022-04-24

Available Online: 2022-05-20

Publish Date: 2023-04-15

Abstract

Abstract

The disposal of used tires causes many environmental problems, and the crushed rubber powder can replace fine aggregate in building mortar. The content and particle size of rubber aggregate in mortar are the main factors affecting the strength of rubber concrete. Alkali-activated slag can replace ordinary Portland cement and improve the environmental friendliness of mortar. The influence of multi-factor coupling on the compressive properties of rubber aggregate mortar was studied. By testing the compressive strength of mortar, significance analysis of the test results was completed and the multivariate nonlinear regression model was established. The microscopic pore measurement and SEM test of mortar samples were carried out to explore the degradation mechanism of rubber aggregate on the compressive strength of mortar. The results show that the increase of rubber aggregate content in mortar will cause the decrease of compressive strength of mortar. Compared with the control group, the average compressive strength of alkali activated mortar decreases by 49.93% and the silicate mortar decreases by 66.62% under 40vol% aggregate replacement rate. Under the high alkaline environment of alkali-activated mortar, the average compressive strength of mortar using 0.38 mm rubber aggregate is 69.65% of the control group, which is the optimal value in the test group. In the low alkaline environment of silicate mortar, with the decrease of rubber aggregate size, the average compressive strength of mortar decreased from 61.46% of the control group to 37.98%.
- recycled rubber aggregate,
- alkali-activated slag,
- compressive strength,
- orthogonal analysis,
- multiple nonlinear regression
Long Abstrsct
Innovation Points

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References(27)

References

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