Journal of Materials in Civil Engineering · 2017 · 281 citations · 45 references
EngineeringMechanical EngineeringDurabilityUltra-high-performance ConcreteNatural AggregatesRecycled Aggregate PropertiesMaterials ScienceRecycled Aggregate ConcreteDurability PerformanceConcrete TechnologyReinforced ConcreteFiber-reinforced Cement CompositeCement-based Construction MaterialRecycled Concrete AggregatesCivil EngineeringAsphalt RecyclingRecycled AggregatesRecyclingDurability PropertiesConstruction Engineering
Recycled concrete aggregates have been studied for two decades and are now viewed as a promising means to conserve natural resources and reduce concrete’s environmental impact. This study investigates the mechanical and durability properties of concretes made with recycled aggregates of varying sizes and replacement ratios. Fourteen RAC batches were produced and tested for compressive strength, elastic modulus, flexural and splitting tensile strengths, workability, drying shrinkage, and water absorption, varying the aggregate replacement ratio, coarse‑aggregate size, and mixing method. The results show that compressive strength alone does not determine RAC performance; the size and content of coarse aggregates significantly influence mechanical and durability properties even at equal compressive strengths.
The use of recycled concrete aggregates as an alternative aggregate material in concrete has been studied over the past two decades. It is now recognized that the recycled aggregate concrete (RAC), where natural aggregates are replaced with recycled concrete aggregates, is a promising technology for conserving natural resources and reducing the environmental impact of concrete. This paper presents a study on mechanical and durability properties of concretes manufactured with recycled aggregates of different sizes and contents. A total of 14 batches of RACs were manufactured. Tests were undertaken to establish the compressive strength, elastic modulus, flexural strength, splitting tensile strength, workability, drying shrinkage, and water absorption of each batch. Test parameters comprised the recycled aggregate replacement ratio, size of coarse aggregates, and mixing method used in the preparation of concrete. The results indicate that the compressive strength is not the only decisive factor on mechanical and durability-related properties of RACs. It is shown that the properties of different RAC mixes of the same compressive strength are affected by the size and content of the coarse aggregates.
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The greening of the concrete industry
Christian Meyer · Cement and Concrete Composites · 2009 · 1.5K citations