Study on Multi-parameter Mechanical and Microstructural Characteristics of Mining-used Cement-based Grouting Materials

Xianda Zang

doi:10.63313/AERpc.9098

Authors

Xianda Zang School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China Author

DOI:

https://doi.org/10.63313/AERpc.9098

Keywords:

Portland Cement, Ultra-fine Cementitious Materials, Rheological Characteristics of Grout, Mechanical Properties of Consolidated Bodies, Acoustic Emission, Microstructural Characteristics

Abstract

To investigate the reinforcement effects of two grouting materials, laboratory tests were conducted using ordinary Portland cement and ultra-fine cement as the test materials. Taking the consolidated bodies of cement-based grouts as the research objects, tests on slurry flow characteristics, uniaxial compressive tests on consolidated bodies, and scanning electron microscopy (SEM) tests were carried out to study the mechanical properties of cement-based grout consolidated bodies with different water-cement ratios. The test results show that the viscosity of ordinary cement-based grout decreases with the increase of water-cement ratio, while the bleeding rate increases accordingly. The uniaxial compressive strength of ordinary cement-based consolidated bodies decreased by 35.1%, 43.9% and 5.2% respectively with the increase of water-cement ratio. Meanwhile, the average cumulative acoustic emission ring counts of ordinary cement-based consolidated bodies decreased by 76.7%, 71.1% and 50.1% respectively with the increase of water-cement ratio. Compared with ordinary cement grout at the water-cement ratio of 1:1, ultra-fine cement grout has lower viscosity and bleeding rate, and its consolidated body exhibits higher uniaxial compressive strength and larger cumulative ring counts. Analysis of SEM micrographs reveals that the ultra-fine cement consolidated body has fewer internal defects, more stable structure and stronger bearing capacity. The above test results indicate that ultra-fine cement can achieve significantly better reinforcement performance as a grouting material than ordinary Portland cement.

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