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Performance of Fresh and Hardened Concrete with Recycled Aggregates Included - Essay Example

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Performance of Fresh and Hardened Concrete with Recycled Aggregates Included

The various kinds of recycled aggregates in use include recycled concrete aggregate (RCA), recycled wash glass sand, recycled rubber tyres and others. This text will attempt to analyse the effects of recycled aggregates on the fresh properties of concrete (such as workability, compatibility, segregation, bleeding etc.) and on the properties of hardened concrete (such as strength, durability etc.). Effects of using recycled aggregate (RA) Recycled aggregates are composed of a host of materials but in general recycled aggregates are composed of common building materials in particular. These effects have been studied in detail in a number of studies. (Mindess & Young, 1981) (Back, 1977) (ACPA, 1993) Recycled aggregates composed of building materials are often composed of wasted concrete, tiles and bricks. In addition materials such as steel, wood, plastics, paper and other similar materials can also become part of the recycled aggregate. All of these materials affect the fresh and hardened properties of concrete significantly. Therefore these materials are generally excluded from recycled aggregates through fine selection by screening through magnetised means, wind separation, manual picking up etc. (Chen et al., 2003). Chen et al studied these effects by creating five mixtures of concrete with recycled aggregates composed of 0%, 17%, 33%, 50% and 67% by weight. Furthermore two groups of aggregate were created having different compositions of aggregate components as Group A (greater amount of tiles included) and Group B (greater amount of bricks included). Recycled aggregates such as sand, mortar, gypsum etc. were kept constant throughout both groups. The properties of both groups of recycled aggregates are shown in the table below and the properties of natural aggregate are shown below it. Figure 1 - Recycled Aggregate Properties Figure 2 - Natural Aggregate Properties Based on the tables above it is apparent that all properties remain nearly the same except for absorption which represents a major effect on fresh concrete. Recycled aggregates are far more absorbent because of their larger particle sizes. This indicates that nearly all of the properties of fresh concrete will be affected negatively. The results of the study also indicated that the properties of hardened concrete would also be affected as the proportion of aggregate included increased. More specifically, the compressive strength of hardened concrete decreases as the recycled aggregate content in it increases. The total change in compressive strength of the hardened concrete was within 10% of the compressive strength of concrete made out of natural aggregates. This is depicted in the graph below. Figure 3 - Change in Compressive Strength of Concrete with Increasing Recycled Aggregate Components Another study by Kovler and Roussel (2011) on the properties of fresh and hardened concrete ended up with similar findings. (Kovler & Roussel, 2011) The study also related that increasing non building based recycled aggregates reduced the properties of hardened concrete by as much as 30% especially in cases of adding rubber as the recycled aggregate. The study suggested that concrete composed of recycled aggregates especially with plastic and rubber components should be used for as low structural loading as warranted. However, in cases that building material based substances are added ...Show more
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Design and Technology – CE2140 Performance of fresh and hardened concrete with recycled aggregates included {Your Name} {KU Number} Introduction There is an increasing trend for using recycled materials to create new concrete in order to increase sustainability and decrease costs among other factors…
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