Abstract
In the present era of infrastructure development, demolishing waste management poses serious problems, particularly in urban centers. Vast development requires huge amounts of conventional concrete aggregates resulting in serious environmental problems. Therefore, efforts are carried out in utilizing demolishing waste, particularly demolishing concrete as coarse aggregates used in new concrete. This article presents laboratory investigations of flexural behavior of reinforced concrete beams made with partial replacement of natural coarse aggregates with coarse aggregates from demolished concrete under 12-month long-term loading. Two batches of beams were cast and cured for 28 days. In the first batch three RC beams with partial replacement of natural coarse aggregates were cast, while in the second batch 6 RC beams with all-natural coarse aggregates were prepared. Out of these six beams three beams were tested under short-term loading to determine maximum load. 50% of this load was used as sustained load on the remaining all beams. The beams were mounted on purpose made frames and deflection, strain, and cracking were recorded on daily basis. After the elapse of the defined time the beams were tested under central point load until failure. Result comparison shows a 4.96% increase in deflection and 2.33% reduction in peak load. Based on the results of this study it is concluded that demolished concrete as coarse aggregates in new concrete shows reasonably good performance under 12-month long-term loading.
Highlights
Concrete has proved itself as the best material for general construction
Long-term loading effects, creep, and shrinkage of concrete made with old concrete as coarse aggregates under 365 days sustained loading were compared with ACI provisions in [8]
To determine the maximum load sustained by the RC beams, three beams made with all-natural coarse aggregates were tested in UTM under central point load (Figure 4)
Summary
Concrete has proved itself as the best material for general construction. But there are several issues related with the production of its ingredients, since they pose problems to the environment. Evaluation of material properties and behavior under sustained/long-term loading is essential. To this end authors in [7] used 0%, 50% and 100% dosage of recyclable aggregates from demolished concrete to replace natural coarse aggregates in casting of reinforced concrete beams. Evaluation of long-term deflection by introducing the creep coefficient of recycled aggregates. The analysis of the results revealed that the size of the aggregates has influence on the final deflection, the authors introduced the regeneration coefficient to deal with this issue. Long-term loading effects, creep, and shrinkage of concrete made with old concrete as coarse aggregates under 365 days sustained loading were compared with ACI provisions in [8]. It is hoped that the outcome of the research will provide detailed understanding of the long-term behavior of the beams for the proposed duration and will improve the confidence about the material and set a landmark for future research in the field
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