6505-11 - Progress in Concrete Technology Challenge...

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1 Progress in Concrete Technology Challenge: Compared to steel, normal concrete has a low strength/weight ratio. Concrete with a higher strength/weight ratio is needed for tall buildings and long-span bridges. Solution: To increase the strength/weight ratio, reduce the weight by using lightweight concrete or increase the strength by using high-strength concrete . Challenge: For placement of concrete in heavily reinforced structures, high workability is needed. Solution: Use high-workability or flowing concrete . Challenge: Drying shrinkage of normal concrete frequently leads to cracking. Solution: Use shrinkage compensating concrete . Challenge: Normal concrete has low toughness and low resistance to impact. Solution: Use fiber-reinforced concrete . Challenge: Low permeability and high chemical resistance are needed for durability of concrete. Solution: Use polymer concrete . Challenge: Control of temperature rise in mass concrete use for dams and other large structures is needed to reduce the chance of cracking of the concrete. Solution: Use techniques for precooling of concrete materials or roller-compacted concrete . Challenge: High density material is needed for use as radiation shielding in nuclear power plants. Solution: Use heavyweight concrete .
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