Pore Structure Characteristics and Its Effect on Mechanical Performance of Cemented Paste Backfill

The development of cemented paste backfilling (CPB) technology has made an important contribution to the mining economy. As a kind porous material, pore structure characteristic backfill is strongly correlated its mechanical properties. In this study, CPB specimens were prepared with tailings/cement ratios (T/C ratio) 4, 6, 10 and curing durations 3, 7, 14, 28 days, respectively. Pore structures characteristics investigated using nuclear magnetic resonance (NMR) scanning electronic microscopy (SEM). uniaxial compressive strength (UCS) was adopted illustrate property specimens. coupling effects T/C ratio time on as well effect size UCS analyzed. results indicated that: 1) microstructural integrity highly related status structure, which can be represented by micro-parameters like porosity, average area, etc. 2) similar normal distribution curve observed from four kinds in CPB. increased, peak shifted left, value decreased, means that decreased became much concentrated; 3) extension most probable led cross-connection pores resulted fracture CPB, shown crack main section.