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Abstract

To investigate the microscopic pore structure improvement mechanism of the addition of basalt fiber on the frost resistance of concrete, this paper prepared six kinds of basalt fiber reinforced concrete with different fiber lengths and contents, and conducted frost resistance and mercury intrusion tests on them. The results show that basalt fiber can improve the surface and internal damage of concrete caused by the freeze-thaw cycles. The quality loss rate and flexural tensile strength loss rate of concrete with 12 mm and 0.06% basalt fiber added are reduced by 73.9% and 26.4% respectively compared to the benchmark concrete. Basalt can significantly optimize the internal pore structure of concrete, reducing its average pore size and harmful pore ratio. Meanwhile, based on the grey correlation theory, this paper determined the pore structure parameter with the highest grey correlation degree with flexural tensile strength and relative elastic modulus, namely the ratio of multiple harmful pores. Finally, multivariate nonlinear regression analysis was adopted to build mathematical models for the flexural tensile strength-pore parameters and relative elastic modulus-pore parameters of basalt fiber reinforced concrete.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.035

First Page

192

Last Page

198

Submission Date

May 2025

Reference

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