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• W127674175 abstract "Owing to shortage of space for land reclamation in Hong Kong, it is difficult to dispose tons of concrete waste generated daily from construction activities. This research aims to adopt Recycled Aggregate (RA) from concrete waste for higher grades of concrete construction. The three parts study is divided. The first part investigates the waste management and recycling in the construction industry by providing methods in managing the waste problems created by the local construction industry. Telephone-interview to the recycling firms, site visits to Construction and Demolition (CD ten material recycling practices are studied, including: i) asphalt; ii) brick; iii) concrete; iv) ferrous metal; v) glass; vi) masonry; vii) non-ferrous metal; viii) paper and cardboard; ix) plastic; and x) timber. Among various types of waste sources, concrete waste was found to be the major proportions between them. Adoption of RA from crushing the demolished concrete wastes thus becomes a burning issue. However, the use of Recycled Aggregate Concrete (RAC) to higher grade applications is rarely reported because of its poor compressive strength and high variability in mechanical behaviour. The benefits, difficulties, and recommendations in adopting RAC are thus explored and reported. The second part includes experimental works for examining the characteristics of RA and the properties of RAC. There are six groups of experimental works in investigating the characteristics of RA, namely: i) particle size distribution; ii) particle density; iii) porosity and absorption; iv) particle shape; v) strength and toughness; and vi) chemical composition. The properties of twelve RA samples and their correlations are explored. As the properties of RA are the main criteria to define their construction applications, classification system is developed, and aided with two new innovative testing techniques: i) Timely Assessment of Water Absorption (TAWA) for measuring the water absorption rate of RA without changing the behaviour of the original RA; and ii) Classification System on Cement Mortar Remains (CSCement) for measuring the amount of cement mortar attached to RA. For the production of RAC, eight groups of experimental works" @default.
• W127674175 created "2016-06-24" @default.
• W127674175 creator A5064905808 @default.
• W127674175 date "2005-01-01" @default.
• W127674175 modified "2023-09-26" @default.
• W127674175 title "Recycled aggregate from concrete waste for higher grades of concrete construction" @default.
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