Experimental study on the influence of high-frequency vibratory mixing on concrete performance

Abstract

The method and parameter of mixing are crucial to the quality of concrete, and ordinary vibratory mixing is beneficial to the performance of concrete, which has been explored in numerous studies. In order to study the influence of high-frequency vibratory mixing on the performance of concrete more accurately, ordinary concrete C40, C50 steel fiber concrete, and C60 high-strength concrete are selected to make reach experiments in the article. After determining the optimum mixing ratio, the contrast experiment on forced mixing and high-frequency vibratory mixing (which at a given frequency) was operated first, which is for studying the improvement of workability and mechanical properties of concrete by vibratory mixing and then exploring the change of concrete performance under different vibration frequency in slump test, compressive strength test, and freeze–thaw test. The results indicate that compared with forced mixing, the compressive strength and splitting tensile strength of concrete all have been proposed in different ages (3 days, 7 days, and 28 days) with vibratory concrete mixing, and C50 steel fiber concrete has the highest compressive strength improvement rate. There is a deviation in the mechanism of concrete in different ages, which is affected by high-frequency vibration. But in the context of the whole test, high-frequency vibratory mixing is helpful for the working properties, mechanical properties, and durability of the concrete. Within the scope of the frequency values in the test, the best vibration frequency for C40 ordinary concrete is 190 Hz, and in 212 Hz, C50 steel fiber concrete and C60 high-frequency concrete present the best performance.

Keywords

• high-frequency vibratory mixing
• concrete
• mechanical properties of concrete