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Abstract

The microstructure and mechanical properties of concrete were improved by adding steel fiber and polymer emulsion. The working properties and mechanical properties of steel fiber concrete, polymer emulsion-modified concrete, and steel fiber polymer concrete were tested at 3 d, 28 d, and 90 d. Nitrogen adsorption test, mercury injection test, and density method were used to obtain the total pore volume, median pore size, and closed porosity of concrete. The influence of steel fiber and polymer emulsion on the microstructure and mechanical properties of concrete was analyzed. The results show that the compressive strength of concrete after adding steel fiber and polymer emulsion has a slight change, but the bending strength increases by 24.1%–69.5%, 34.3%–70.5%, and 3.4%–43.7% at day 3, day 7, and day 90, respectively, and the bending ratio changes from 6.37–8.34 to 3.99–5.93. The total pore volume, total specific surface area, average pore size, and median pore size of concrete decrease, and the closed porosity increases. The optimal content of steel fiber should be 0.6%–0.9%, and the optimal content of emulsion is 6%–9%. Steel fiber and polymer emulsion can effectively improve the toughness and microstructure characteristics of concrete, and the effect of their mixing is obviously better than that of a single material.

Publication Date

7-14-2023

DOI

10.14048/j.issn.1671-2579.2023.03.041

First Page

259

Last Page

264

Submission Date

March 2025

Reference

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