000			a
999			_c20594 _d20594
003			OSt
005			20240116162456.0
008			240116b xxu||||| |||| 00| 0 eng d
040			_aAIKTC-KRRC _cAIKTC-KRRC
100			_922776 _aCarvalho, João Vítor de Azambuja
245			_aEvaluation of strength parameters for application in cemented iron ore tailings stacks
250			_aVol.53(4), Aug
260			_aUSA _bSpringer _c2023
300			_a775-788p.
520			_aThe dry stacking of tailings, rather than the slurry disposal, is an alternative to overcome the safety-related issues of the tailings dams and to reduce the space required for the tailings’ storage. The addition of small amounts of cement into the tailings before the stacking may enhance the engineering properties of the material, enabling the construction of more inclined and higher mounts without compromising the pile’s structural stability. The present research assesses the mechanical response of compacted iron ore tailings-cement mixes for dry stacking. Ultrasonic pulse velocity and unconfined compressive strength tests were carried out for a variety of 15 combinations of dry densities and amounts of cement, defined via a full factorial design setup. Then, drained standard triaxial tests were conducted for two dosages and three confinement levels ( = 50, 100, and 200 kPa). The results of unconfined strength and shear modulus were successfully correlated with the η/Civ, while the triaxial testing data have revealed further characteristics concerning the mechanical response of the artificially cemented iron ore tailings. Two methodologies have properly related the triaxial testing data to the unconfined compressive strength results permitting the determination of peak-strength envelopes for specific dosages as a function of basic tests. So, the paper permits estimating c′ and ϕ′ for a specific condition of porosity and cement content by unconfined compression results without carrying out triaxial testing or any other complex tests. This would be useful for viability studies and the pre-project phase of dry stacks.
650		0	_94690 _aConstruction Engineering and Management (CEM)
700			_922777 _aWagner, Alexia Cindy
773	0		_x 0971-9555 _dSwitzerland Springer _tIndian geotechnical journal
856			_uhttps://link.springer.com/article/10.1007/s40098-023-00712-9 _yClick here
942			_2ddc _cAR