They found that the compressive strength of concrete at 28 days reached up to 49 MPa Xu et al [29] used IOW with polypropylene PP fibers in volume fractions of % % % and % Effects of iron ore tailings on the compressive strength and permeability of ultra high performance concrete Constr Build Mater 2020
The compressive strength of paste containing IOT and sample containing GGBFS with a similar specific surface area were MPa and MPa at 3 days and then reached MPa and MPa at 7 days with an increase of % and % respectively
The addition of iron ore tailings influenced the properties of bricks such as reduction in firing linear shrinkage and compressive strength increase in bulk density water absorption and porosity Additionally bricks with iron tailings were classified as non hazardous and did not pose a threat to the environment since most elements were
The briquettes have been prepared by flue dust and iron ore fines with fly ash as a binder applying 100 MPa pressure Thereby they have been reduced at 1200 °C and then crushed into fines with the generation of 95% metallic iron powder of 75 µm and the rest oxidised materials the compressive strength value changes to % as the
The results showed the synthesis of a zeolite phase in all specimens and the SEM micrographs showed a transformation process of the glass wool residue Finally high mechanical performances were found to the iron ore tailing based geopolymer reaching values higher than 100 MPa for compressive strength and 20 MPa for flexural strength
The compressive strengths of the specimens with various water binder ratios are shown in Fig 3 a There was a drop in compressive strength when the water binder ratio increased from to which was attributed to the separation between aggregates and cement paste as excess water was added
Iron ore tailings are a common type of hazardous solid waste in China and have caused serious environmental problems and the high cost of producing ultra high performance concrete UHPC provides the motivation to look for low priced raw materials The control mix showed a compressive strength of MPa and every 10% increase in the
The concrete sample of 50% IOT recorded the highest compressive strength of MPa at 28 days and the highest flexural strength of MPa compared to MPa for reference concrete
Utilizing a variety of solid wastes to prepare alkali activated cementitious materials is one of the principal trends in the development of cementitious materials Commonly used alkali activation precursors such as granulated blast furnace slag GBFS and fly ash FA will be less available due to resource pressures Supply limitation is an important reason to
1 Introduction Iron ore tailings IOTs are a type of mining and mineral waste generated by the iron ore mining industry [1] Most IOTs are disposed of in landfills which prevent alternative land uses and contaminate the surrounding soil [2] Therefore the development of methods for the utilisation of IOTs in the construction industry has become a popular research
The compressive strengths of the specimens with various water binder ratios are shown in Fig 3 a There was a drop in compressive strength when the water binder ratio increased from to which was attributed to the separation between aggregates and cement paste as excess water was added
relationship exists between the compressive strength of frozen and unfrozen iron ore of approximately the same porosity and the compressional wave velocity squared It is concluded that seismic surveys may therefore be expected to provide a good estimate of the strength of iron ore frozen and unfrozen
The laboratory experiments reveal the uniaxial compressive strength value of collected ore sample Mpa with elastic modules of Mpa and Poisson ratios in sample no 18 shown the
The compressive strength obtained after 3 days of curing in room temperature was MPa Then an experiment was carried out to evaluate a possible increase in compressive strength promoted by
The degradation mechanism of the high temperature compressive strength of iron coke with 30 and 40% iron ore and increased carbonization temperature from 800 to 1 000°C was discussed KEY WORDS iron ore; iron coke; high temperature; compressive strength; carbonization iron coke are the basis for its successful preparation in
Compressive strength MPa 7day Compressive strength Mpa 28day Compressive strength Mpa 0 1 2 3 Normal concrete Split Tensile strength MPa 20% 30% 40% 50% 60% Split Tensile strength MPa 7day Split Tensile strength MPa 28day Split Tensile strength MPa 5
The transformation of iron ore tailings IOT into structural ceramsites suitable for concrete applications has been previously documented [4 6] Currently the industrial scale production of IOT ceramsite is achieved through rotary kiln processes Cylinder compressive strength MPa Bulk density kg/m 3 Apparent density kg/m 3 1 h
Fig 11 shows the effect of bond parameters on the compressive strength The compressive strength shows a non linear effect on the interparticle bond thickness and an approximately linear effect on bond strength The difference in the rate of strength increase can be explained by recalling the bond failure criterion that the bonding forces are
As compressive strength test provides a measure of the resistance of hydraulic cement and other mortars to compressive stresses attempts were made to compare the UCS of cube specimens made of lateritic aggregates with that of granitic aggregates which after 28 days of curing were and MPa respectively The UCS of the cubes made of
iron ore tailings may be utilised for complete replacement for conventional aggregates in concrete The iron ore tailings aggregates concrete exhibited a good mechanical strength and even in the case of compressive strength there was an improvement of % over conventional aggregates concrete The indirect tensile strength did not
The laboratory experiments reveal the uniaxial compressive strength value of collected ore sample Mpa with elastic modules of Mpa and Poisson ratios in sample no 18 shown the maximum properties of iron ore such as uniaxial tensile strength Young s modulus and Poisson s ratio and their influences and affects
The sized tailings were mixed with sodium silicate solution used as an activator to form a paste The paste was moulded and cured for different durations It was found that the geopolymer bricks produced from iron ore tailings could have a compressive strength as high as MPa