Effect of Excitation Stirring on Compressive Strength of Cement Stabilized Crushed Stone and Coal Gangue

Abstract

Abstract: In order to study the influence of excitation stirring process on the performance of cement stabilized coal gangue mixture, based on cement stabilized crushed stone, the effects of conventional stirring and excitation stirring on the unconfined compressive strength of cement stabilized base materials with different cement dosages were compared and analyzed. The results show that increasing the excitation stirring in the dry mixing state has a significant effect on the compressive strength of the base mixture. The 7 d unconfined compressive strength of the mixture reaches the best under the conditions of 0.4 MPa air pressure, 30 s of vibration dry mixing and 30 s of ordinary wet mixing. The average increase of the strength of cement stabilized crushed stone and cement stabilized coal gangue mixture is about 20%, the strength improvement of coal gangue mixture is more significant, and the less the cement dosage, the greater the increase. The SEM results show that the distribution of hydration products in the mixture is more uniform and the structure is more compact after the excitation stirring. According to the linear fitting calculation, when the cement dosage is 2.0%～7.0% (mass fraction, the same bellow), the vibration mixing can save 8.9%～26.3% cement for the gravel mixture and 12.9%～30.8% cement for the coal gangue mixture. And the saving rate is inversely proportional to the cement dosage.

Key words: base material, excitation stirring, cement stabilized crushed stone, coal gangue, unconfined compressive strength

CLC Number:

U416.1

WANG Jiliang, GUO Wenbin, SONG Qingkai, XU Weidong, LIU Peng. Effect of Excitation Stirring on Compressive Strength of Cement Stabilized Crushed Stone and Coal Gangue[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 757-765.

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