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  • Utilisation of iron ore tailings as aggregates in concrete

    The aim of this paper is to study the feasibility of using the iron ore tailings as both fine and coarse aggregates in making concrete. The paper evaluates the technical and environmental characteris-tics of the concrete with the main concern of recycling and adding economic value to the iron ore

    Utilisation of iron ore tailings as aggregates in concrete

    07-09-2015· Abstract. Sustainable handling of iron ore tailings is of prime concern to all stakeholders who are into iron ore mining. This study seeks to add value to the tailings by utilising them as a replacement for aggregates in concrete. A concrete mix of grade 40 MPa was prepared in the laboratory with water–cement ratio of 0.5.

    A study on suitability of iron ore overburden waste rock

    In the process, the waste produced from Mining industry is one of such source. The aim of this study is to evaluate the suitability of iron ore waste as partial replacement of coarse aggregates in concrete with reference to the conventional materials.

    Evaluation of iron ore tailings as replacement for fine

    01-09-2016· Zhang et al. also investigated properties of concrete with iron ore tailings and manufactured sand as fine aggregate. They reported that the drying shrinkage of mixed sand is less than river sand concrete and with increase in IOT the drying shrinkage of mixed sand decreases.

    Mangalore Tile Waste As Coarse Aggregate In Concrete

    26-03-2019· In this study, the potential of using these broken clay tile chips as coarse aggregate is studied inconcrete production. The use of concrete FS provides some advantages for related industries. In our project we used Iron ore dust(slag) as a fine aggregate with complete sand replacement. Use of Iron ore dust in concrete M as an alternative to normal aggregates. Conclusion

    Study on Replacement of Coarse Aggregate by E-Waste in

    E- waste as a concrete aggregate. Owing to scarcity of coarse aggregate for the preparation of concrete, partial replacement of E-waste with coarse was attempted. The work was conducted on M20 grade mix. In this work, thepercentage of various replacement levels of coarse aggregate with E-waste in the range of 0%, 5%, 10%, 15%, and 20%.

    UG-Mat Mineral Processing Wastes Recycled Materials

    For example, iron ores are often found in hard igneous or metamorphic rock formations, so waste rock from iron or taconite ore processing is usually hard and dense. For the most part, lead and zinc ores are found in limestone and dolomite rock, so the waste rock from processing these ores will have characteristics much like other carbonate aggregates.

    Recycled concrete as fine and coarse aggregates in

    25-05-2015· Synopsis. The effects of using crushed concrete as coarse and fine aggregates upon strength and deformation of concrete are reported. The properties of recycled aggregates differ from those of natural aggregates due to the presence of a considerable proportion of mortar attached natural aggregate and loose mortar.

    Replacement of Coarse Aggregate by Demolished Brick Waste

    concrete. b) Coarse aggregate: Coarse aggregate can be defined as inert granular materials such as gravel, crushed stone and sand. Coarse aggregate is one of the essential ingredients apart of water and cement in concrete production. It consists about 60 to 75 percent of total concrete production

    CERAMIC TILES WASTE AS COARSE AGGREGATES PARTIAL

    In accordance with conservation efforts, this research focuses on ceramic tile waste as partial coarse aggregates replacement for concrete production, prevention of environmental pollution with considering the elements of sustainable and cost-saving construction projects, especially material usage. Moreover, many of the construction industry in

    Utilisation of iron ore tailings as aggregates in concrete

    07-09-2015· Abstract. Sustainable handling of iron ore tailings is of prime concern to all stakeholders who are into iron ore mining. This study seeks to add value to the tailings by utilising them as a replacement for aggregates in concrete. A concrete mix of

    Iron Casting Waste as a Coarse Aggregate of Strength

    Test results and analysis have been made that iron slag as a substitute agent of coarse aggregate tends to meet all the standard specification requirements as a coarse aggregate. Bending strength of concrete, also increased of iron casting waste 25 and 50%. The highest flexural strength value occurred at 28 days with a value of 5.840 MPa.

    [PDF] Assessment of Mechanical and Durability Properties

    This paper investigates the suitability of using iron ore tailings (IOTs) and crushed waste rock (CWR) as fine and coarse aggregates to prepare high strength concrete (HSC) with 28-day target compressive strength of 80 MPa. This experimental investigation was carried out on four series of concrete mixtures with different combinations of fine and coarse aggregates, such as IOTs and crushed

    Magazine of Concrete Research ICE Virtual Library

    The use of imported iron ores has led, in recent years, to a lowering in the bulk density of some blastfurnace slags produced in the United Kingdom. To take account of this change, it was decided to examine the properties of this lighter-weight slag and its suitability as dense coarse aggregatefor concrete.

    Use of Waste Materials As a replacement of Coarse

    15-05-2013· Use of waste in concrete: Research efforts has been done to match society’s need for safe and economic disposal of wastematerials. The use of waste materials saves natural resources and dumping spaces, and helps to maintain aclean environment. The current concrete construction practice is thought unsustainable because, not only it isconsuming enormous quantities of stone, sand, and

    Experimental and Statistical Evaluations of Strength

    Iron ore tailings (IOT) are the by-products of iron ore beneficiation, and these tailings are disposed of in several tons annually in quarries, landfills, and tailings dams, causing environmental issues. Various researchers have attempted to study the properties of IOT and the use of them in concrete

    A Study on Compressive Strength of Concrete by Partial

    studies shows that agriculture waste coconut shell can also are used as coarse aggregate for concrete. Properties of Coconut Shell . 1. Coconut shell has high strength and modulus properties. 2. It has added advantage of high lignin content. High lignin content makes the composites more

    Reconstruction of broken Si-O-Si bonds in iron ore

    04-10-2019· This paper reports a study on the reconstruction of broken Si-O-Si bonds in iron ore tailings (IOTs) in concrete. Limestone and IOTs were used to investigate the influence of different types of coarse aggregates on the compressive strengths of concrete samples. The differences in interfacial transition zones (ITZs) between aggregate and paste were analyzed by scanning electron

    Lecture 4. Aggregates Aalto

    recycled concrete aggregate (RCA) when consisting primarily of crushed concrete or more general . recycled aggregate (RA) when it contains substantial quantities of materials other than crushed concrete. Currently, only the use of coarse aggregate derived from construction or demolition waste is recommended for use in new concrete construction.

    Types Of Aggregates Used In Construction

    07-08-2020· Aggregates are one of the important and essential constitutes of concrete. There are different Types of Aggregates used in making concrete. Aggregate provides the body to the concrete, reduces shrinkage, and affects the economy. Aggregate makes concrete strong and durable. Generally, aggregate in concrete occupies around 70-80 percent of the volume of concrete, their impact on

    Iron Casting Waste as a Coarse Aggregate of Strength

    Test results and analysis have been made that iron slag as a substitute agent of coarse aggregate tends to meet all the standard specification requirements as a coarse aggregate. Bending strength of concrete, also increased of iron casting waste 25 and 50%. The highest flexural strength value occurred at 28 days with a value of 5.840 MPa.

    Experimental and Statistical Evaluations of Strength

    Iron ore tailings (IOT) are the by-products of iron ore beneficiation, and these tailings are disposed of in several tons annually in quarries, landfills, and tailings dams, causing environmental issues. Various researchers have attempted to study the properties of IOT and the use of them in concrete

    Magazine of Concrete Research ICE Virtual Library

    The use of imported iron ores has led, in recent years, to a lowering in the bulk density of some blastfurnace slags produced in the United Kingdom. To take account of this change, it was decided to examine the properties of this lighter-weight slag and its suitability as dense coarse aggregatefor concrete.

    Use of Waste Materials As a replacement of Coarse

    15-05-2013· Use of waste in concrete: Research efforts has been done to match society’s need for safe and economic disposal of wastematerials. The use of waste materials saves natural resources and dumping spaces, and helps to maintain aclean environment. The current concrete construction practice is thought unsustainable because, not only it isconsuming enormous quantities of stone, sand, and

    End of life recycling concretecentre

    Recycled concrete can be used as aggregate in new concrete, particularly the coarse portion. When using the recycled concrete as aggregate, the following should be taken into consideration: Recycled concrete as aggregate will typically have higher absorption and lower specific gravity than natural aggregate and will produce concrete with slightly higher drying shrinkage and creep.

    BARYTES CONCRETE FOR RADIATION SHIELDING: MIX

    Municipal waste combustor ash as an aggregate in concrete masonry units. Miscellaneous Berg, E R. The use of municipal waste combustor ash (MWCA) as aggregate in concrete masonry units magnetite limonite in which the non-hydrated iron ore magnetite is used as an aggregate and the limonite again ismore

    Rust Coloured Stains on the surface of Exposed Aggregate

    of concrete. This document deals specifically with rust coloured stains created by “Ironstone” on the surface of Exposed Aggregate Concrete. Ironstone is the common term used to describe unstable aggregate (stone) particles that are rich in iron oxide minerals. These stones are generally dark grey to

    CHAPTER 1 COMPONENTS OF CONCRETE virginiadot.org

    COMPONENTS OF CONCRETE Concrete is made up of two components, aggregates and paste. Aggregates are generally classi! ed into two groups, ! ne and coarse, and occupy about 60 to 80 percent of the volume of concrete. The paste is composed of cement, water, and entrained air and ordinarily constitutes 20 to 40 percent of the total volume.

    Types Of Aggregates Used In Construction

    07-08-2020· Aggregates are one of the important and essential constitutes of concrete. There are different Types of Aggregates used in making concrete. Aggregate provides the body to the concrete, reduces shrinkage, and affects the economy. Aggregate makes concrete strong and durable. Generally, aggregate in concrete occupies around 70-80 percent of the volume of concrete, their impact on

    QUALITY ASSURANCE for AGGREGATES Indian Railways

    preferred in concrete mixes. Size of aggregates: The nominal maximum size of coarse aggregate should be as large as possible within the limits specified, but in no case greater than 1/4th of the min. thickness of the member. For most works, 20 mm aggregate is suitable. 40 mm and 10 mm size should be used for work specified.

    Iron Casting Waste as a Coarse Aggregate of Strength

    Iron Casting Waste as a Coarse Aggregate of Strength Bending Concrete (Case Study: PT. Brawaja Makassar South Sulawesi) Author: Natsir Abduh Subject: Journal of Engineering and Applied Sciences Keywords: Bending strength, concrete waste, iron casting, coarse aggregate, material, UNHAS Created Date: 4/5/2019 9:40:02 AM

    Study on application of iron tailings fine aggregate in

    Study on application of iron tailings fine aggregate in concrete Ke Tang1,a,*,Xuesong Mao1,b,Xinlei Tang1 1School of highway, Chang’an University, Xi’an, 710064, China aemail: [email protected] bemail: [email protected] Key words: Iron tailings, Mix design, Workability, Slump. Abstract: Natural sand plays a unique role in the mix proportion of road cement concrete, however,

    Use of Waste Materials As a replacement of Coarse

    15-05-2013· Use of waste in concrete: Research efforts has been done to match society’s need for safe and economic disposal of wastematerials. The use of waste materials saves natural resources and dumping spaces, and helps to maintain aclean environment. The current concrete construction practice is thought unsustainable because, not only it isconsuming enormous quantities of stone, sand, and

    End of life recycling concretecentre

    Recycled concrete can be used as aggregate in new concrete, particularly the coarse portion. When using the recycled concrete as aggregate, the following should be taken into consideration: Recycled concrete as aggregate will typically have higher absorption and lower specific gravity than natural aggregate and will produce concrete with slightly higher drying shrinkage and creep.

    BARYTES CONCRETE FOR RADIATION SHIELDING: MIX

    Municipal waste combustor ash as an aggregate in concrete masonry units. Miscellaneous Berg, E R. The use of municipal waste combustor ash (MWCA) as aggregate in concrete masonry units magnetite limonite in which the non-hydrated iron ore magnetite is used as an aggregate and the limonite again ismore

    Impacts of nonconventional construction materials on

    30-10-2020· Ceramics. Ceramics wastes emanating from construction industry and those sourced from production sites have been used for concrete production [11, 75].He replaced ceramic waste as coarse and fine aggregate (CCA&CFA) in the replacement of 25% to 100% and it was observed that the compressive strength gained in the later stage at 28 days [].

    Aggregates for Concrete University of Memphis

    coarse aggregate. There are several reasons for specifying grading limits and nominal maximum aggregate size; they affect relative. 82. Design and Control of Concrete Mixtures EB001. Fig. 5-4. Range of particle sizes found in aggregate for use in concrete. (8985) Fig. 5-5. Making a sieve analysis test of coarse aggregate in a laboratory. (30175

    CHAPTER 1 COMPONENTS OF CONCRETE virginiadot.org

    COMPONENTS OF CONCRETE Concrete is made up of two components, aggregates and paste. Aggregates are generally classi! ed into two groups, ! ne and coarse, and occupy about 60 to 80 percent of the volume of concrete. The paste is composed of cement, water, and entrained air and ordinarily constitutes 20 to 40 percent of the total volume.

    QUALITY ASSURANCE for AGGREGATES Indian Railways

    preferred in concrete mixes. Size of aggregates: The nominal maximum size of coarse aggregate should be as large as possible within the limits specified, but in no case greater than 1/4th of the min. thickness of the member. For most works, 20 mm aggregate is suitable. 40 mm and 10 mm size should be used for work specified.

    Different Types of Aggregate Types of Concrete Each

    High-Density Aggregate: Used to create very dense and heavy weight concrete mixes that are used mainly for shielding against radiation or for pipeline ballast. Heavy weight natural aggregates such as Baryle, Hermatite, Iron Ore and Magnetite are good examples. Heavy duty aggregate should be used for shielding radiation or pipeline ballast.