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Because of their wide range of concrete materials,low cost,high compressive strength,can be poured into various shapes,and a good fire-resistant and difficult to weathering,low maintenance costs,the building structure in the world today has become the most widely used in building materials.The main drawback is that the concrete tensile poor,vulnerable to cracking.A large number of engineering practice and theoretical analysis shows that almost all of the concrete structures are working with cracks,but some very small cracks,or even invisible to the naked eye (
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