Iron ore tailings in the production of cement tiles: a value analysis on building sustainability

Abstract The present work discloses the development of a sustainable cement tile (SCT) produced with Iron Ore Tailings from tailings dams (IOT). Initially, technical evaluation and environmental analysis of IOT were performed through physical, chemical and morphological characterisation, leaching and dissolution tests. Its feasibility as a pigment was also investigated. Subsequently, the value analysis was performed, starting from an empathy map to a study on environmental, social and emotional values in the relationship between people and product. As result, the IOT presented fine, crystalline particles, no toxicity, and is technically feasible to be employed as filler, aggregate and pigment in the production of SCT. The colour layer of the SCT presented more homogeneous colour and less pores than conventional ones. Therefore, the design of the SCT was developed, incorporating intangible values such as: environmental ideology, local identity and social expression. In this sense, the present work seeks to assist in the decision-making process involving IOT as construction material.

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Effect of Thickness in Intermediate Layer on Intensity of Stress Singularity at a Vertex in Three-Dimensional Bonded Joints

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.324-325.883 ◽

2006 ◽

Vol 324-325 ◽

pp. 883-886

Author(s):

Hideo Koguchi

Keyword(s):

Three Dimensional ◽

Stress Singularity ◽

Simple Relationship ◽

Bonded Joints ◽

Stress Distributions ◽

Singular Stress ◽

Value Analysis ◽

A Value ◽

Eigen Value ◽

The Relationship

In the present paper, singular stress fields at the vertex on the interface in three-dimensional bonded joints are analyzed using BEM. The order of stress singularity is determined solving an eigen equation based on FEM formulation and the stress distribution is expressed using the result of the eigen-value analysis. A simple relationship between the thickness of layer and a value of stress is introduced. Then, stress distributions for various thicknesses of layer are unified using the relationship, and the unified intensity of stress singularity is determined.

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Value analysis in measuring the impact of information technology and its success in developing information services

ARID International Journal of Informetrics ◽

10.36772/arid.aijisc.2021.232 ◽

2021 ◽

Author(s):

انعام علي توفيق الشهربلي

Keyword(s):

Information Technology ◽

Information Service ◽

Information Services ◽

Value Analysis ◽

A Value ◽

Descriptive Approach ◽

Qualitative Measure ◽

The Impact ◽

The Relationship

The research aims to measure the effect of using information technology in developing information service. And measuring the role of the relationship between the effectiveness of developing information services and efficiency in the success of using information technology, depending on the method of value analysis, and using the descriptive approach (the analytical method). The sample reached (70) individuals from the beneficiaries. The research adopted the qualitative measurement method of value analysis in a questionnaire dedicated to the information technology variable and to know the level of success in developing information services. To analyze the results, the research came out with a set of results, including: Information technology, using the method of value analysis, has an impact on increasing the efficiency of information services by a value of (49%), and increasing efficiency by an amount of (51%). The results also showed that the beneficiaries were satisfied and satisfied with the information services provided using information technology by (81%), in addition to the existence of a statistically significant moral correlation between the efficiency of using IT successfully and the effectiveness of developing information services. The value in information measurements as a qualitative measure of quality and with a qualitative trend in the discipline.

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Effect of Elapsed Time after Mixing on the Strength Properties of Lime–Iron Ore Tailings Treated Black Cotton Soil as a Road Construction Material

Infrastructures ◽

10.3390/infrastructures5110089 ◽

2020 ◽

Vol 5 (11) ◽

pp. 89

Author(s):

Annafi Qaudri Babatunde ◽

Eberemu Adrian Oshioname ◽

Yohanna Paul ◽

Osinubi Kolawole Junwolo

Keyword(s):

Iron Ore ◽

Construction Material ◽

Base Material ◽

Road Construction ◽

Strength Properties ◽

Black Cotton Soil ◽

Soil Parameters ◽

Dry Density ◽

Elapsed Time ◽

Iron Ore Tailings

The study evaluated the effect of elapsed time after mixing on the strength properties of lime and iron ore tailings (IOT) treated black cotton soil (BCS) (an expansive tropical black clay) as road construction material. BCS was treated with 0, 2, 4, 6, and 8% lime and 0, 2, 4, 6, 8, and 10% IOT content by dry weight of soil. Tests carried out include Atterberg limits, compaction, unconfined compressive strength (UCS), California bearing ratio (CBR) (unsoaked condition), and microstructure of specimens. Statistical analysis was done using MINI-TAB software. Results show that the liquid limit (LL) of BCS–lime–IOT mixtures decreased with increase in lime and IOT content. The LL values of all the treated BCS increased between 0 and 1 h elapsed time after mixing. On the other hand, the plastic limit (PL) of BCS decreased with increase in lime and IOT content while the plasticity index (PI) decreased from 27.7 to 22.9% for 0% lime/0% IOT content and from 30.6 to 26.6% for 0% lime/10% IOT content. Maximum dry density (MDD) of BCS increased while optimum moisture content (OMC) decreased with higher IOT content. The natural BCS recorded OMC value of 25.6% decreased to 15.2% for 8% lime/10% IOT treatment. The strength (i.e., UCS and CBR values) increased with increase in lime/IOT contents between 0 and 2 h elapsed time after mixing. Peak values were recorded for 8% lime/8% IOT treatment for all lime content considered. Regression analysis shows a strong relationship between the strength properties and the soil parameters. An optimal 8% lime/8% IOT treatment of BCS for elapsed time after mixing not exceeding 2 h was established and is recommended as sub-base material for low-trafficked roads.

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Study on Producing Sand-Lime Bricks with Iron Ore Tailings and Phosphogypsum and other Solid Wastes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.575-576.357 ◽

2013 ◽

Vol 575-576 ◽

pp. 357-360

Author(s):

Wen Hong Tao ◽

Xing Hua Fu ◽

Guang Li Chen ◽

Bin Wu

Keyword(s):

Fly Ash ◽

Iron Ore ◽

Raw Materials ◽

Solid Wastes ◽

Hydration Mechanism ◽

Iron Ore Tailings ◽

Weight Content ◽

Pressure Shaping ◽

And Performance ◽

The Relationship

The paper studied preparing sand-lime bricks by pressure shaping and nature curing, discussed the stimulation effect of compound activators composed of phosphogypsum and lime. The result shows that: when the proportions of raw materials are as follows: 10~15% weight content is iron ore tailings, 3% is phosphogypsum, 5% lime, 5% cement, 40~45% low quality fly ash, and 22~37% chips, the strength of sand-lime bricks produced gets its highest. XRD and SEM are used to characterize its mineral composition and microstructure. The paper also discussed the relationship between structure and performance inside the bricks, and its hydration mechanism.

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Effects of reductant type on coal-based direct reduction of iron ore tailings

Annales de Chimie Science des Matériaux ◽

10.3166/acsm.42.453-466 ◽

2018 ◽

Vol 42 (3) ◽

pp. 453-466

Author(s):

Wei WANG ◽

Pengfei YE ◽

Xiaoli ZHOU ◽

C WANG ◽

Zekun HUO ◽

...

Keyword(s):

Iron Ore ◽

Direct Reduction ◽

Iron Ore Tailings ◽

Reduction Of Iron ◽

Direct Reduction Of Iron

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Dewatering polymer application in an iron ore tailings dam

23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020 ◽

10.36487/acg_repo/2052_13 ◽

2020 ◽

Author(s):

Frederic Braga ◽

Raymond Guang ◽

Junio Pereira ◽

Jorge Davo

Keyword(s):

Iron Ore ◽

Tailings Dam ◽

Iron Ore Tailings ◽

Polymer Application

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Relation Between Metacognitive Ability with Science Process Skills on Grade 8th Students in MTs Negeri 3 Parigi

Jurnal Riset Pendidikan MIPA ◽

10.22487/j25490192.2019.v3.i1.pp8-13 ◽

2020 ◽

Vol 3 (1) ◽

pp. 8-13

Author(s):

Moch. Munir ◽

Amiruddin Kade ◽

Muslimin Muslimin

Keyword(s):

Research Result ◽

Reverse Direction ◽

Process Skills ◽

Science Process Skills ◽

A Value ◽

Regression Test ◽

Feasibility Test ◽

Relationship Of ◽

The Relationship ◽

Academic Year

This study aims to determine the relations between metacognitive to science process skills on grade VIII students MTs Negeri 3 Parigi. This research is descriptive, the approach used is a quantitative approach, manifested in the form of numbers analyzed by statistics and the results are described. The population is students of MTs Negeri 3 Parigi Academic Year 2017-2018 with a population of three classes, with a sample of 30 students. The instrument used is a metacognitive questionnaire consisting of 50 questions and an essay about science process skills 6 questions test. The result of the prerequisite test of the research result is all metacognitive indicators of normal and linear distributed and based on the regression feasibility test show that all data is feasible for regression test. The result of the regression test and test of determination to obtain a value which is not significant. Based on the results of the research analysis it can be concluded that the relationship of each metacognitive indicator to science process skills was not significant even there were metacognitive indicators that reverse direction significantly. The magnitude of the relationship of each metacognitive indicator with science process skills maximum 15.3%.

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Selective flocculation applied to Barsuan iron ore tailings

International Journal of Mineral Processing ◽

10.1016/0301-7516(85)90015-8 ◽

1985 ◽

Vol 14 (1) ◽

pp. 67-75 ◽

Cited By ~ 44

Author(s):

K. Hanumantha Rao ◽

K.S. Narasimhan

Keyword(s):

Iron Ore ◽

Selective Flocculation ◽

Iron Ore Tailings

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Review of the relationship between aggregates geology and Los Angeles and micro-Deval tests

Bulletin of Engineering Geology and the Environment ◽

10.1007/s10064-020-02097-y ◽

2021 ◽

Vol 80 (3) ◽

pp. 1963-1980

Author(s):

Solomon Adomako ◽

Christian John Engelsen ◽

Rein Terje Thorstensen ◽

Diego Maria Barbieri

Keyword(s):

Los Angeles ◽

Crystal Size ◽

Grain Shape ◽

Mechanical Performance ◽

Pore Space ◽

Construction Material ◽

Engineering Properties ◽

Coarse Grained ◽

The Impact ◽

The Relationship

AbstractRock aggregates constitute the enormous volume of inert construction material used around the globe. The petrologic description as igneous, sedimentary, and metamorphic types establishes the intrinsic formation pattern of the parent rock. The engineering properties of these rocks vary due to the differences in the transformation process (e.g. hydrothermal deposits) and weathering effect. The two most common mechanical tests used to investigate the performance of aggregates are the Los Angeles (LA) and micro-Deval (MD) tests. This study reviewed the geological parameters (including mineralogy, grain and crystal size, grain shape, and porosity) and the relationship to Los Angeles and micro-Deval tests. It was found that high content of primary minerals in rocks (e.g. quartz and feldspar) is a significant parameter for performance evaluation. Traces of secondary and accessory minerals also affect the performance of rocks, although in many cases it is based on the percentage. Furthermore, some studies showed that the effect of mineralogic composition on mechanical strength is not sufficient to draw final conclusions of mechanical performance; therefore, the impact of other textural characteristics should be considered. The disposition of grain size and crystal size (e.g. as result of lithification) showed that rocks composed of fine-grain textural composition of ≤ 1 mm enhanced fragmentation and wear resistance than medium and coarse grained (≥ 1 mm). The effect of grain shape was based on convex and concave shapes and flat and elongated apexes of tested samples. The equidimensional form descriptor of rocks somehow improved resistance to impact from LA than highly flat and elongated particles. Lastly, the distribution of pore space investigated by means of the saturation method mostly showed moderate (R = 0.50) to strong (R = 0.90) and positive correlations to LA and MD tests.

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