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Children, Work and Quality Spun Articles

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But concrete production consumes natural resources at a very high rate and has detrimental effects on air and water quality. Sunken and cracked concrete will require plenty of labor before you can achieve a new, refinished surface. A polymer concrete surface can transform the appearance of your porch, making it smooth while protecting it from damage. Concrete blocks quickly became a standard building material after the first one was molded in 1882, according to the Portland Cement Association. Concrete blocks, known more formally as concrete masonry units, make concrete easy to work with, because the mixing and setting has already been done.

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The proportion of cement, sand and mortar may vary from 1:1:2 (considered the best quality mixture) to 1:3:6 (a low quality mixture mostly used for concrete filling). Reinforced or Structural Concrete In this type, lightweight cement concrete is reinforced with metal rods to impart tremendous load bearing capacity. It is mainly used in structures like foundations, certain types of concrete slabs, dams, and concrete block retaining walls on bridges and overpasses. This type may also be called non-reinforced concrete. Lean Concrete It is a plain type of concrete with a larger aggregate to cement ratio than structural concrete.

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Vacuum Concrete Vacuum concrete contains high water content which allows sufficient ease while working and placing it into complicated molds or while doing extensive reinforcement. This concrete is then subjected to a vacuum that ensures that no excess quantities of water is retained, which in turn ensures a stronger concrete on hardening. This concrete is used for paving slabs, road channels, kerbs, lintels, bricks, fence posts, bridge beams etc. Pumped Concrete This concrete is transported through pipes from the mixer to where it is deposited. The concrete is prepared by discharging it from the mixer into a hopper which feeds it to a pump which pushes it through a pipe.

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The vehicle has a large rotating drum in which the concrete continuously mixes until it is delivered to the site. The mix specification is first decided by the supplier and the contractor, prior to delivery. High Density Concrete High density concrete is used to build nuclear shield walls, ballast blocks and sea walls. It is produced using different materials in place of aggregate, like iron shot, steel shot and lead shot or barytes and haematite. Water Resistant Concrete Water resistant concrete includes water proofed or watertight concrete. Waterproofed concrete is manufactured when a water resistant layer or surface is added on the mass of ordinary concrete.