Concrete recycling reduces landfill waste and provides economical aggregate. Concrete waste from demolition or construction failure is crushed to produce recycled aggregate. Recycled aggregate is used in new concrete, road base, or landscaping. Crushing equipment including jaw crushers and impact crushers breaks concrete into manageable pieces. Sizing screens separate material into useful gradations. Contamination removal eliminates attached rebar, wood, and other materials. Separation equipment including magnets and air classifiers remove metal and light materials. Recycled aggregate properties differ from natural aggregate. Recycled concrete aggregate (RCA) has higher porosity and water absorption. Concrete containing RCA has slightly lower strength than concrete with natural aggregate. Performance is acceptable for many applications including pavement, base layers, and non-structural concrete. Cost savings from reduced new aggregate extraction often offset slightly reduced performance. Environmental benefits include reduced quarrying, reduced landfill use, and reduced transportation. Life-cycle analysis demonstrates environmental benefits of recycling. Recycled aggregate market is growing as environmental concerns increase. Quality standards for recycled aggregate ensure consistent performance. Testing of recycled aggregate verifies it meets specifications. Regulations requiring recycled content in concrete encourage use. Some jurisdictions mandate minimum percentages of recycled aggregate.