Experimental study on delamination and strength characteristics of cemented waste rock backfill

作者：Yao, Nan; Liu, Yiding; Wang, Qihu^*; Oppong, Felix; Huang, Tianyu; Zhou, Zhijin; Du, Ping

来源：CONSTRUCTION AND BUILDING MATERIALS, 2023, 365: 130058.

DOI：10.1016/j.conbuildmat.2022.130058

• Cemented waste rock backfill (CWRB)
• Aggregate distribution
• Delamination
• Uniaxial compressive strength (UCS)

To analyze the relation of segregation and strength of cemented waste rock backfill (CWRB), the aggregate distribution, uniaxial compressive strength (UCS), and failure law of the CWRB with different mass concentra-tions and accelerator contents were investigated by scanning the backfill section and acoustic emission test under uniaxial compression conditions. The test results show that: (1) The higher the mass concentration and accel-erator content, the more uniform the aggregate distribution of the specimens; (2) The higher the mass con-centration and accelerator content, the better the skeleton structure of the specimens, and the UCS of the specimens was significantly increased from 3.53 MPa to 21.59 MPa; (3) The higher the mass concentration and accelerator content, the material properties of the specimens changed from plastic to elastic, and the integrity of the specimens was better after destruction (4) The relationship between the uniformity coefficient and UCS was constructed by defining the aggregate uniformity coefficient according to the degree of specimen delamination, and the strength increased exponentially with the increase of the aggregate uniformity coefficient.