Posted on May 29, 2010 7:26 pm

self compacting concrete

Concrete strength is a problem of the greatest vital to any builder using concrete in their construction.  When concrete is being used, it is important to think about numerous factors which should determine the power of the concrete structure, and which should result from weak points that concrete is prone to.  
 
 Concrete has a very high compressive strength, implying that when something is pushing a concrete structure together, it is extremely resilient.  The exact level of a particular concrete structure’s compressive strength will be decided by mainly 2 things : the materials utilized in making the concrete, and the water-cementitious ratio.  The first of these, the aggregate materials which are used to make the concrete, can have a drastic impact on the structures’ compressive strength.  Most commonly, the aggregate used to create concrete is granite, some other form or stone, or sand ; however , in a few cases, concrete with atypically high compressive strengths have been made with aggregates like quartz.  Alternative routes of changing the total to increase concrete’s compressive strength is to use much finer total, eliminating big stones and rocks, using only fine powders.  The water-cementitious proportion is precisely what it sounds like, the ratio of water to cement used to make the concrete in question.  A lower water-cementitious ratio will result in a better, more adaptable concrete.  
 
 Unlike its strong compressive strength, concrete’s tensile strength is lacking.  When concrete is pulled apart by two forces, comparable to tearing a piece of bread, its strength is intensely weak.  In reality concrete’s tensile strength is only 15% of its compressive strength in some extreme cases.  In order to make up for this weakness, concrete is almost always reinforced with a kind of fiber or strengthening bar within the concrete structure itself.  The strengthening bar or fiber has a much higher tensile strength, and works to hold the concrete together even if forces are working to drag it apart.  The buttressed bar or fiber is generally constructed in a grid through the entire concrete structure, and the gains in tensile strength because of the use of reinforcement bar can be dramatic.  
 
 although concrete is not terribly vulnerable to growth or compression due to changes in temperature ( as a result of a low coefficient of thermal growth ), changes in temperature or atmosphere can still cause Problems for concrete structures.  Just as importantly than this however , is the proven fact that over time , all concrete structures will shrink as a consequence of ongoing chemical reactions occurring within the concrete from its production till its passing.  The cause of this shrinking is in part due to dehydration of the concrete mix over a period of time.  
 
 though cracks may appear in concrete after a little time due to enlargement, shrinking, stress or compression they typically are no explanation for concern.  The base line is that if concrete is made correctly, and is bolstered with a strengthening bar or fiber, the end product will be a highly strong, resilient structure.  Concrete strength is something that many folks recognize, and is the reason so many structures in today’s world are built with concrete : bridges, roads, skyscrapers and more.

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