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optimum compressive strength value of 49.6 MPa at 28 days, while the control concrete recorded the least value of 45.8 MPa. Keywords: - Itakpe Iron Ore Tailings, Fine aggregate, Natural river sand, Density, Compressive strength. INTRODUCTION The present day challenge for the construction industry has to do with the concept of sustainable
Heat treatment consists of nucleation and crystallization, the best heat treatment in the experiment of coal gangue and iron ore tailings is as followed: nucleation temperature 780 o C and crystallization temperature 980 o C, the bending strength is up to 283.3 MPa. X-ray diffraction (XRD) shows that crystalline phase is augite, and the ...
Compressive Strength (MPa)/Age Ref. Mortar: 0.18: Iron ore tailings: 6.32/7 days: 32.14/7 days : Mortar: 0.20: Iron ore tailings/copper tailings: 6.80/3 days: 27.6/3 days ... This is one of the reasons why the flexural strength of iron ore tailings–based cementitious composite is lower than that of standard sand-cement composites . Under the ...
compressive strength iron ore. منزل ; compressive strength iron ore; ... compressive strength mpa iron ore. Research on iron ore tailing improving Compressive ... Effect of Raw Material Ratios on the Compressive Strength ... Use of Blast Furnace Slag Aggregate in …
Results and discussion Compressive Strength The concrete mixtures were made with the controlled mix as well as with RM and IOT to check the compressive strength for 7 and 28 days of 173 European Scientific Journal July 2014 edition vol.10, No.21 ISSN: 1857 – 7881 (Print) e - ISSN 1857- 7431 Compressive strength in N/mm2 curing (Fig. 1 and Fig ...
The concrete mix of M30 with 30 % IOW as fine aggregate and 0 % basalt fiber recorded the highest compressive strength up to 27.54 MPa and 29.91 MPa at 7 and 28 days, respectively. ... Effects of iron ore tailings on the compressive strength and permeability of ultra-high performance concrete. Constr. Build. Mater., vol. 260 (2020) ...
Compressive Strength of Fired Pellets Using Organic Binder: Response Surface Approach for Analyzing the Performance ... especially with the pressure force of 100 MPa and 125 MPa, whereas with increasing the pressure force to 150 MPa for the die diameter 20 mm for both lucerne hay and maize stover, a significant increment occurred in the ...
The compressive strength, splitting tensile, flexural strength, and bond stress of the mix10 were 37.71 MPa, 4.27 Mpa, 6.12 MPa, and 6.75 MPa, an increase of 7.37%, 20.96%, 24.13%, and 11.2% over ...
Compressive behaviour of polypropylene filled with iron ore tailings Journal of Engineering Design and Technology . 10.1108/jedt-12-2012-0056
Reusing of iron ore tailings (IOT), particularly as recycled aggregate to prepare concrete, plays an important role in reducing dependence on natural resources and solving the problem of waste accumulation. In this paper, the effects of IOT as aggregate on the flowability, compressive strength of ultra-high performance geopolymer concrete (UHPGC) were …
Compressive strength (MPa) 7 28 90 Curing time (d) (a) Compressive strength Iron tailing sand Quartz sand River sand 20 22 24 26 28 30 32 34 36 38 40 Flexural strength (MPa) …
The preparation of iron ore tailings (IOTs) into supplementary cementitious materials (SCMs) is an effective approach to achieve value-added utilization of industrial solid waste. ... achieving 28.6 MPa at 7 days and 42.9 …
The stabilization of CEBs with CCR increased the dry compressive strength (CS) from 1.1 MPa with 0% CCR to 4.3 MPa with 10% CCR and above; decreased the bulk density (ρb:1800–1475 kg/m3) and ...
Compressive strength (MPa) 7 28 90 Curing time (d) (a) Compressive strength Iron tailing sand Quartz sand River sand 20 22 24 26 28 30 32 34 36 38 40 Flexural strength (MPa) 79028 Curing time (d) (b) Flexural strength F : e in uence of di erent sands on strength. 3. Results and Discussion. . Inu ence of Di erent Sands on the Strength of UHPC. e in
Strength is a critical factor in metal uses, for example, some applications require stronger aluminum parts, while some products need high steel hardness or yield strength of steel, this may determine the selection of …
The compressive strength of the concrete with iron ore tailings after freezing-thawing was approximately 90% that of the reference concrete; hence, the compressive strength of the tailing mixes after freezing-thawing had some degree of discount . When used in buildings with antifreeze requirements, the concrete needs to be combined with an air ...
Compressive strengths and dynamic elastic properties of . The ultrasonic velocities and compressive strength of frozen and thawed iron ore are strongly influenced by the magnitude of porosity ami moisture content The velocities and strength both increase as the porosity decreases or as the moisture content increases Iron ore frozen is more homo #173 geneous …
The effects of oolitic haematite ore additions on the compressive strength of iron ore pellets were investigated in a preliminary study. It was found that additions of oolitic haematite at levels of up to 15% by mass decreased the compressive strength from about 3250 N to 1729.1 N, which is below the minimum requirement of 2500 N for use in a ...
The laboratory experiments reveal the uniaxial compressive strength value of collected ore sample 98.09 Mpa with elastic modules of 79.113 Mpa and 0.12 Poisson ratios …
Download scientific diagram | Response surface of the compressive strength (CS, in MPa) of alkali activated mortars with the addition of 40wt% (-1) and 60wt% (-1) of tailing for 7 days (-1) and 28 ...
Typical values of uniaxial strength (in MPa) for nine common rock types (after Johnson and Degraff, 1988). Rock Tensile Strength (MPa) Compressive Strength (MPa) Limestone …
of formed briquettes thus increasing the briquettes strength . 3.2. Compressive strength of fire high barite briquette at 700oC-1200oC . Fig 6 show the Compressive strength of fire high barite briquette at 700oC-1200o C .from this figure it is evident that the compressive strength increased as the temperature of fired sample increase. IJSER
Iron (Fe) is a metal that has been known since ancient times. In fact, the Earth's crust is made up of 5% of iron, which is the second most abundant metal after aluminum.
The field and laboratory investigations were performed and found that the ore rock is having uniaxial compressive strength between 5.09 to 22.65 MPa, point load strength between 0.54 to 3.22 MPa ...
Effects of iron ore tailings on the compressive strength and permeability of ultra-high performance concrete. Author links open overlay panel Weifeng Zhang a, Xiaowei Gu a, Jingping Qiu a, ... The compressive strength of ultra-high performance concrete (UHPC) at 28 days can be greater than 150 MPa (greater than 100 MPa, in China) [1]. The ...
On this basis, the compressive strength values are set to 70 MPa, 95 MPa, and 120 MPa, the value of the shear stiffness per unit area is taken as 3 × 10 10 N/m 3 according to the literature [37]. The corresponding parameter values of the normal stiffness per unit area, shear stiffness per unit area, and critical shear stress are obtained using ...
The use of Iron Ore Tailings (IOT) as finer aggregates and/or fillers in geopolymer mortars is a possible alternative ... (compressive strength of 34.0 MPa), 7 days (compressive strength of 50.3 MPa), and 14 and 28 days (compressive strength below 40.0 MPa). Their compressive strength results are lower for curing times greater than 7 days.
Similarly, the 90-day compressive strength trend aligned with the 28-day results. The 90-day compressive strength of S20M10 was 55.03 MPa, which was 96.93% of that of the PC sample. ... Effects of iron ore tailings on the compressive strength and permeability of ultra-high performance concrete. Construct. Build. Mater., 260 ...
KemPel™ Iron–Ore Pelletization Industry consolidation and Compressive Strength 500°C [kg] Magnetite Hematite Magnetite … for hematite pellets are not shown since the compressive strength results of hematite iron–ore … » More detailed! Laboratory studies for improving green ball strength in bentonite …. For iron ore pellets made with moisture ranging from 9.2 to …
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 …