editorial参考文献.pdf

Journal of King Saud University – Engineering Sciences 29 (2017) 301
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Journal of King Saud University – Engineering Sciences
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Editorial
Civil infrastructure – the set of interconnected structural ele- Concrete Aggregate (RCA) that is derived from old concrete stem-
ments such as roads, water supply, sewers, electrical grids, ming from demolition sites. USA alone produces 325 million tons
telecommunications networks, and the built infrastructure of of waste concrete each year; however, less than five percent is
domestic, commercial and public buildings – is the foundation of recycled in new concrete as RCA. Unfortunately, the attached high
a community’s health, safety and prosperity. Unfortunately, most porosity mortar on the surface of RCA results in poor bond, inferior
countries around the world are experiencing a rapid loss of service- transport properties and a consequential loss of durability and
ability and safety in their concrete infrastructure. This is primarily strength. Furthermore, RCAs may introduce a number of contami-
due to a combination of improper maintenance and import