what of pyrite in sand is harmful to concrete

what of pyrite in sand is harmful to concrete 1 what of pyrite in sand is harmful to concrete 2


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Does anybody use sand as a base before they pour concrete ,

Does anybody use sand as a base before they pour concrete of a driveway? I was told by one of the contractor that I needed to put a layer of sand before I poured concrete for the driveway Another contractor told me that no sand is used because it is the cause for cracks as the concrete ,...

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Pyrite Mineral information, data and localiti

Pyrite Group The isometric cubic polymorph of orthorhombic marcasite Pyrite is a very common mineral also one of the most common natural sulfides, and the most common disulfide , found in a wide variety of geological formations from sedimentary deposits to hydrothermal veins and as a constituent of metamorphic rocksThe brassy-yellow metallic colour of pyrite has in many cases lead to ....

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Internal attack by sulphates in cement pastes and mortars ,

Aggregates containing sulphide minerals, such as pyrite, are considered unsuitable for use in concrete structures, since they can cause damage to the durability of structures However, in large works, it is common that the viability of the enterprise has as an influencing factor...

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Deicing Salts And Concrete

Deicing Salts - Does It Really Harm Concrete? DEAR TIM We just moved into our new house Our builder has advised us not to use rock salt on our concrete sidewalks and driveway for snow and ice removal He told us that it will damage the concrete I don t believe him, ,...

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Foundation Damage Due to Composition or Inclusions ,

Foundation Damage Due to Composition or Inclusions Foundation Cracks, Spalling, Stains caused by composition, inclusions, steel, rust Defects in concrete mix too much water, for example , or defects in placement of steel or iron reinforcement too close to surface, for example , as well as use of problem materials in concrete such as high levels of cinders, coal ash, or Iron sulfide mineral ....

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Is excessive cement in concrete harmful and why?

Apr 28, 2017 0183 32 Y 1 it becomes unnecessarily expensive 2 it needs too much water to make it workable, which leads to excessive drying shrinkage, as well as the fact that with more cement paste holding the aggregate particles apart, that also leads to excessi....

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Properties and Application of Concrete Made with Sea ,

Properties and Application of Concrete Made with Sea Water and Un-washed Sea Sand Keisaburo KATANO1 , Nobufumi TAKEDA2, Yoshikazu ISHIZEKI3, and Keishiro IRIYA4 1Department of production engineering, Obayashi Corporation, Japan 2Department of production engineering, Obayashi Corporation, Japan 3Department of production engineering, Obayashi Corporation, Japan...

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Concrete degradation

Concrete degradation may have various causConcrete can be damaged by fire, aggregate expansion, sea water effects, bacterial corrosion, calcium leaching, physical damage and chemical damage from carbonatation, chlorides, sulfates and non-distilled water This process adversely affects concrete exposed to these damaging stimuli...

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Internal attack by sulphates in cement pastes and mortars ,

Internal attack by sulphates in cement pastes and mortars dosed with different levels of pyrite , Keywords Internal attack by sulphides Pyrite Oxidation Concrete Durability 1 Introduction The concrete structure degradation-mechanisms, attacked , harmful ,...

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Pyrite Indiana Geological Water Survey

Pyrite s dark side is because it weathers easily to form acid mine drainage that can adversely affect coal mined lands In mineral collections it can deteriorate and ruin other minerals in the collection and in aggregate, it can rust out leaving iron stains on concrete buildings and in pavement...

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Types and Causes of Concrete Deterioration

Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors The following summary discusses potential causes of concrete deterioration and the factors that influence them CORROSION OF EMBEDDED METALS Fig 1 Corrosion of reinforcing steel is the most common cause of concrete ....

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How to Sand a Concrete Floor Hunker

Do not let the slurry dry on the concrete because it will harden in place If you only have a small area to sand, you can also use a palm sander, orbital sander or belt sander Rough imperfections may require the use of a special diamond disc and a concrete floor grinder...

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ASTM C33 / C33M

This specification defines the requirements for grading and quality of fine and coarse aggregate for use in concrete Fine aggregate shall consist of natural sand, manufactured sand, or a combination thereof Fine aggregate shall be free of injurious amounts of organic impuriti Fine aggregate for use in concrete that will be subject to ....

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Pyrite Mineral Uses and Properties

Pyrite should not be present in the base material, subsoil or bedrock under roads, parking lots, or buildings Oxidation of pyrite can result in damage to pavement, foundations, and floors In parts of the country where pyrite is commonly found, construction sites ,...

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Internal deterioration of concrete by the oxidation of ,

In concrete, the main factor increasing the oxidation degree of pyrite, found either in framboidal or massive form, is a high pH, related to the amount of OH- ions in the pore solution In concrete, both forms of pyrite have the same behavior in a high-pH solution the higher the alkalinity of the solution, the faster the reaction...

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Effects of Salt on Concrete

Oct 27, 2014 0183 32 Order concrete at 4,000 psi or greater Use of a water reducer in the mix will minimize water in the mix stronger concrete , yet maintain flowability keep it easy and cheap to place Excessive water will lower the strength of the concrete and if that water becomes trapped it could also have additional weakening effects on the surface...

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Dangers Of Pyrite Mining

Acid mine drainage - Wikipedia, the free encyclopedia Yellow boy in a stream receiving acid drainage from surface coal mining , In this case, the pyrite has dissolved away yielding a ,...

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What is Pyrite? Why is pyrite a problem? test ,

Pyrite or Iron Pyrite FeS2 is a very common mineral that is present in many sedimentary rocks as framboidal crystals Subject to certain conditions, pyrite is problematic in confined construction, such as under floor filling and bridge embankments This is due to a ,...

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Smoothing Rough Concrete

Jul 08, 2013 0183 32 Rough concrete can be very difficult to work with Not only does it limit you to the types of tools that can be used to apply an epoxy coating, but it will also add hidden square footage to the ....

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Information on Sanding Concrete Hunker

Before your attempt to sand cracks or holes in your concrete foundation, porch, or other structure in preparation for repair, having them examined by a professional inspector This damage may reveal more serious problems that are compromising the integrity of your home, and patching them will not maintain the strength of the concrete...

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Play Sand And Is It Safe For My Kids Sakrete

It seems that recently sand has gotten a bad name due to the industrial applications it is used in When using sand in industrial settings, such as for sand blasting sand these can be broken up into very fine particles that if one is exposed to and inhaled for a period of time may cause health problems...

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OVERVIEW Pyrite

Yes, for the garage slab using sand rather than gravel could be advantageous For the basement we must always use clean 3/4 20mm gravel IF THE GRAVEL AROUND THE FOUNDATION, OVER THE PERIMITER DRAINS, CONTAINS PYRITE, CAN THIS BE DANGEROUS ,...

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What is Pyrite in Houses? Property Health Check

It is not unusual for cracks to be visible in foundation walls, structural walls and floors in your home that have no relation to pyrite These cracks could potentially stop the sale of your house, as potential buyers will not take a chance in buying a property that may have pyrite under its concrete floors...

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Frequently Asked Questions about Pyrite Testing and Pyrite ,

Frequently Asked Questions about Pyrite in Hous If I suspect pyrite in my house, what should I look for? In most types of house construction, backfill is compacted over the soil and then the concrete floor slabs is poured over the backfill...

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TECHNIQUES FOR CONCRETE REMOVAL AND BAR ,

Techniques for Concrete Removal and Bar Cleaning on Bridge Rehabilitation Projects Michael C Vorster James P Merrigan Robert W Lewis Richard E Weyers ia Polytechnic Institute State University The Charles Edward Via, Jr Department of Civil Engineering 200 Patton Hall Blacksburg, VA 24061-0105 r slTrp Strategic Highway Research Program...

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Rust Coloured Stains on the surface of Exposed Aggregate ,

materials such as sand and aggregates commonly used in the production of concrete Ironstone or Pyrite is just one mineral in thousands that can be present in any single source of sand or stone and only detailed and exhaustive petrographic analysis can identify the presence , cleaners are particularly harmful to humans Read any safety ....

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How do pyrite and pyrrhotite damage building foundations ,

Pyrite and pyrrhotite in aggregates and concrete Aggregates, such as sand, gravel, crushed stone, or other rocky material, are used as fill material in construction and are added to cement and water to make concrete Aggregates come from a wide variety of sources, and sometimes the source rocks may contain pyrite or pyrrhotite...

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Why is sea sand not used for construction purposes? How ,

Sand primarily silica is used in construction as a component in various materials like concrete, mortar etc Definitely the salts adsorbed dissolution might not actually occur on sand are going to affect the durability in reinforced concrete....

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SANDING The CONCRETE counter top

Jan 28, 2017 0183 32 We are SANDING the concrete counter top It is a little messy but it is SO worth it They are a diamond in the rough before you sand them I hope you get ,...

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Pyrite in Aggregate Concrete Construction Magazine ,

Is the presence of pyrite in an aggregate likely to be injurious to concrete? The presence of an appreciable amount of pyrite iron disulphide is undesirable, since this compound readily decomposes into weak products such as iron sulphate and limonite, along with the formation of sulfuric ac...

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