Ompletely recyclable concrete of aggregate-recovery type by using microwave heating

To build up a resource recycling society, the environmental issue of concrete is approached comprehensively with a new technique using aggregate coating with dielectric material and microwave heating. The increase of concrete strength is achieved by 1.2 times usingimproved coating agent mixed properly with silica-fume and by-product powder. The recovery of high-quality aggregate can also beachieved with low energy by using microwave heating selectively for coating layer. In addition, about 90% of original aggregate can be recycled. Thus, the trade-off relationship between strength of concrete and recovery of aggregates and another trade-off between energy consumption and aggregate quality have been solved simultaneously.