Method for evaluating sulfate freezing and thawing resistance of recycled coarse aggregate self-compacting concrete

By conducting freeze-thaw cycle tests in a sulfate freeze-thaw environment, the damage indicators of self-finished concrete of regenerated crude aggregate were measured, which solved the problem of poor durability in a sulfate freeze-thaw environment, and achieved accurate evaluation of its performance and improved durability.

CN119804535APending Publication Date: 2025-04-11SOUTHEAST UNIV
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Patent Information

Application Number
CN202411799953.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-04-11

AI Technical Summary

Technical Problem

The poor durability of recycled coarse aggregate self-finished concrete in sulfate freeze-thaw environments limits its engineering application in the load-bearing structure.

Method used

An evaluation method is used to measure and compare the damage indicators of the specimen such as mass loss rate, dynamic elastic modulus damage value and ultrasonic wave velocity damage value by preparing regenerated coarse aggregate self-finishing concrete specimens and conducting freeze-thaw cycle tests in different freeze-thaw environments to evaluate its anti-sulfate freeze-thaw performance.

Benefits of technology

This method can accurately evaluate the performance changes of regenerated coarse aggregate self-finished concrete in sulfate freeze-thaw environment, providing theoretical basis and technical support to improve its durability and engineering applications.

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Abstract

The invention relates to a method for evaluating sulfate freezing and thawing resistance of recycled coarse aggregate self-compacting concrete. The method comprises the following steps: S1, preparing a recycled coarse aggregate self-compacting concrete test piece in which stones are completely or partially replaced by recycled coarse aggregate according to design requirements; s2, immersing the recycled coarse aggregate self-compacting concrete test piece in a freeze-thaw medium to carry out a freeze-thaw cycle test; s3, measuring a damage index of the recycled coarse aggregate self-compacting concrete test piece; s4, comparing the damage indexes of different recycled coarse aggregate self-compacting concrete test pieces to obtain the recycled coarse aggregate self-compacting concrete test piece with excellent comprehensive performance. According to the method, the influence of different replacement rates of the recycled coarse aggregate, different freeze-thaw environments and multiple freeze-thaw cycles on the performance of the recycled coarse aggregate self-compacting concrete can be accurately evaluated, so that theoretical basis and technical support are provided for improving the durability and engineering application of the recycled coarse aggregate self-compacting concrete in the sulfate freeze-thaw environment.
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