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The use of recycled aggregate in replacing the normal coarse aggregates in concrete construction has become popular among researchers. They compare the performance and characteristics of the two aggregates used.
Aggregates for Concrete Concrete Technology 11 2. Synthetic Aggregates Thermally processed materials, expanded clays and shale. Aggregates made from industrial byproducts, blastfurnace slag fly ash. 3. Recycled Aggregates Made from municipal wastes and recycled concrete from demolished buildings and pavements.
distribution is between and 25 mm. Figure 1 presents an image of the recycled concrete aggregates. Figure 1. Recycled concrete aggregates. Production and Caracterization of Recycled Concrete Aggregate The recycled concrete aggregate was obtained from the crushing of concretes that were produced in laboratory.
Effects of using recycled concrete aggregates on the Engineering Properties of Concrete: Programme and Proceedings of the use of recycled materials in Engineering constructions, The Institute of Engineers, Australia 3031 May 1996, pp147152.
mortar in conventional concrete. • NA (Natural Aggregate) = aggregate obtained from crushed stone or gravel. • OC (Old Concrete) = concrete particles obtained from demolished concrete structures which can be used as raw material for the production of recycled aggregates. Old concrete is also referred to as original concrete or demolished concrete.
Merlet, and Pimienta, P. (1994), "Mechanical and Physico Chemical Properties of Concrete Produced with Coarse and Fine Recycled Concrete Aggregates," Demolition and Reuse of Concrete and Masonry, Rilem Proceeding 23, EFN Spon, pp. 343353.
material, a composite of aggregates including sand and gravel, plus cement, water, and other materials. Cement is a key ingredient of concrete, typically making up 10% to 12% of the volume.
Rollercompacted concrete (RCC) pavement has renewed interest among designers as a sustainable pavement option with the potential to lower total cement content, incorporate recycled aggregates, reduce road closure time, and decrease total project costs.
The ultimate strength of concrete is related to water/cement ratio and the size, shape, and strength of the aggregate used. Concrete with lower water/cement ratio (down to ) makes a stronger concrete than a higher ratio. Concrete made with smooth pebbles is weaker than that made with roughsurfaced broken rock pieces for example.
coarse aggregates were replaced by recycled concrete aggregates. In the fourth and fifth concrete mix 75% 100 % of natural coarse aggregates were replaced by recycled concrete aggregates respectively. II. MATERIALS AND THEIR PROPERTIES The materials which were used in this investigation along with their properties are given in the table 1. Table1
The strength of recycled aggregates concrete can be increased by lowering the water–binder ratio if water reducers are used to provide the adequate workability. ... aggregates production process on properties of recycled aggregate concrete. Cement and Concrete Research, 2007, 735742.
durability of concrete produced using recycled aggregates was investigated. Physical and chemical properties of crushed concrete aggregates were assessed and compared to those of fresh aggregates. Concrete samples were produced using different water to cement ratios and were tested for
cement paste and the interfacial transition zones in recycled aggregate concrete. Use of milled waste glass, as partial replacement of cement, is estimated to produce significant gains in strength and durability of recycled aggregate concrete. Milled waste glass was .
conventional concrete. The physical and mechanical properties of the materials were tested as per IS 2386 (Part IVIII) 1960[6]. Properties of coarse aggregates The properties of the coarse aggregates are given in Table 1. The surface texture of the ceramic tile aggregates was found to be smoother than that of crushed stone aggregate.
The recycled concrete aggregates are generally more absorbent and less dense than the ordinary shape of aggregates is similar to that of the crushed stone. Concretes made with aggregates resulting from the recycling present good qualities of handiness, durability and