Abstract
Green concrete is an active area of research. Structural demolishing waste is a global serious problem, particularly in urban areas. This research paper presents the experimental evaluation of the effect of long term loading on reinforced green concrete beams. Three beams were cast with partial replacement of natural coarse aggregates with demolished old concrete. Three beams were cast with all-natural coarse aggregates to compare the results. The beams were mounted on purpose made frames for 9 months. Deflection, strain and cracking in beams were monitored on a daily basis. After 9 months, the beams were tested until failure in a universal load testing machine under central point load. It was observed that the proposed beams exhibited 3.55% reduction in maximum load caring capacity compared to control specimens. The obtained results show good performance of the proposed green concrete beams under 9-month long term loading.
Highlights
The production of conventional concrete ingredients gave rise to several environmental issues
It was further observed that the maximum deflection in the proposed beams is within the allowable limits specified by ACI 318
The reduction in maximum attained load of beams with recyclable aggregates is recorded equal to 3.55% whereas the increase in deflection is equal to 4.39%, both less than 5%
Summary
The production of conventional concrete ingredients gave rise to several environmental issues. It is essential to check the performance of the proposed concrete under long-term loading to study the behavior of the material and improve the confidence in using it To this end, shrinkage, creep and deflection under long-term loading using recycled aggregates and high volumes of fly ash were studied in [4]. Authors in [5] extended the study to concrete creep and shrinkage They used four replacement levels of coarse aggregates, namely 0%, 20%, 50% and 100% and two different water-cement ratios, 0.5 and 0.65 for 1000 days in order to study the parameters. Authors in [10] studied the flexural capacity of recycled concrete beams under the combined effect of corroded steel and sustained loading They observed reasonable performance of the proposed material under longterm loading
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