• Environmental impact of concrete Wikipedia

    The environmental impact of concrete, its manufacture and applications, are complex.Some effects are harmful; others welcome. Many depend on circumstances. A major component of concrete is cement, which has its own environmental and social impacts and contributes largely to those of concrete.. The cement industry is one of the primary producers of carbon dioxide, a potent greenhouse gas.

  • Harmful Effects From Crushing Concrete

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    Both coarse aggregates and fine aggregates are the main constituents of concrete because they not only give the body to the concrete, it also have a significant effect on the fresh concrete based on aggregate’s shape, size, texture, grading and crushing type. Moreover it is proved that aggregate’s types has the severe effect on physic-mechanical properties of concrete as aggregate covered

  • Published in: American Journal of Civil Engineering and Architecture · 2013Authors: I B Muhit · S Haque · M R AlamAbout: Water–cement ratio · Absorption of water · Properties of concrete
  • Toxicity of Concrete: discuss (stone work forum at permies)

    Because it is porous, it will hold onto many things that come into contact with it, including toxins. In those cases, yes, concrete is toxic. However, there are probably far more instances of concrete being used for applications that don't expose it to harmful substances, and there's little if any danger from using it if you're in a pinch.

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  • Effect of high levels of fines content on concrete properties

    The effects of surface roughness, crushing index and lithology of manufactured sand particles on the performances of pavement cement concrete are investigated, in comparison with river sand

  • Effects of the Parent Concrete Properties and Crushing

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  • Is inhaling concrete dust harmful Answers

    2008-09-13· Not likely. While breathing concrete dust and soot is not good for you, harmful effects generally would come from prolonged exposure over a period of months of breathing high dust levels.

  • Worker Safety Series Concrete Manufacturing

    Hazard: Exposure to wet concrete can result in skin irritation or even first-, second- or third-degree chemical burns. Compounds such as hexavalent chromium may also be harmful. Solutions: Wear alkali-resistant gloves, coveralls with long sleeves and full-length pants, waterproof boots and eye protection.

  • Effects of the Parent Concrete Properties and Crushing

    2013-12-12· The present paper reports on the findings of an experimental study on the concomitant effects of the strength of the parent concrete, size of the natural aggregates used in the parent concrete, and the number of crushing stages on the properties of coarse recycled concrete aggregates, including mortar content, water absorption, bulk density

  • Aggregates for Concrete

    concrete and also the durability,strength, thermal properties, and density of hardened concrete. This Bulletin describes types of aggregates normally used in concrete, aggregate properties affecting performance of the concrete, tests used to measure aggregate properties, and methods used to obtain test samples. Normalweight as well

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  • Negative effects of high water to cement ratio

    2011-08-31· Other than reduction in strength, are there other negative effects to having a high water to cement ratio? Such as additional shrinkage, cracking, durability, etc. The reason I ask is because in my experience, most of the issues I see with concrete is poor consolidation. Additionally, I have rarely seen low break strenght results. Based on this

  • Strength and stiffness of compacted crushed concrete

    If it is the case, the quality control of CCA as the backfill material of civil engineering soil structures will become difficult. In view of the above, this series was performed to evaluate the effects of the strength of original concrete (before crushing) on the strength and stiffness of compacted CCA. At the same time, the strength and

  • Cement Hazards and Controls Health Risks and Precautions

    Corrosive bleed water from the concrete is absorbed by the worker’s pants and held against the skin for prolonged periods. Without waterproof knee pads, kneeling on wet concrete can irritate or burn the skin. Cement dust released during bag dumping or concrete cutting can also irritate the skin. Moisture from sweat or wet clothing reacts with

  • Is excessive cement in concrete harmful and why? Quora

    Yes. 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...

  • Environmental impact of concrete Wikipedia

    The environmental impact of concrete, its manufacture and applications, are complex.Some effects are harmful; others welcome. Many depend on circumstances. A major component of concrete is cement, which has its own environmental and social impacts and contributes largely to those of concrete.. The cement industry is one of the primary producers of carbon dioxide, a potent

  • Batching Concrete, Block and Asphalt Plants Health and

    Block plants have the same conveyor and mixing hazards as other processing operations associated with the quarry industry but they have two added hazards as the concrete is pressed into shape and this presents a risks to persons from the operation of hydraulic rams and during maintenance operations when there are risks during the changing of

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