Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate
The use of concrete mixes with recycled materials has gained traction in research communities. However, the major drawback of the recycled concrete aggregate (RCA) has been the contribution of the cement paste mortar attached to the surface. The quantity of surface-attached mortar on the virgin aggr...
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Wiley
2022-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2022/6804155 |
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| author | Brian Jacks Odero Raphael N. Mutuku Timothy Nyomboi Zachary Abiero Gariy |
| author_facet | Brian Jacks Odero Raphael N. Mutuku Timothy Nyomboi Zachary Abiero Gariy |
| author_sort | Brian Jacks Odero |
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| description | The use of concrete mixes with recycled materials has gained traction in research communities. However, the major drawback of the recycled concrete aggregate (RCA) has been the contribution of the cement paste mortar attached to the surface. The quantity of surface-attached mortar on the virgin aggregate dominates and defines the shear performance of concrete beams. Concrete shear failure is usually abrupt and catastrophic, especially in concrete beams without shear reinforcement. The effectiveness of the maximum size of RCA for the performance of untreated and treated with pozzolanic cement and rice husk ash (RHA) slurry was investigated. A total of sixteen (16) beams containing RCA of four (4) maximum sizes, 10, 14, 20, and 25 mm, were prepared and tested after 28 days. The beams were loaded in shear using shear span-depth ratios of 1.25 and 2.50. The results showed that the shear strength of the beams increases as the aggregate size increases to a maximum size of 20 mm, beyond which the shear strength reduces. It was attributed to the attached mortar, which increased as the size of the aggregate increased, creating a weak zone for shear failure in the concrete. In addition, RCA pretreatment using slurry-containing cement and RHA strengthened the attached mortar on the aggregate surface. It resulted in a dense and more compact aggregate that slightly improved the shear strength by about 2.2% for beams containing 20 mm RCA size. The ultimate shear strength of the experimental work in the study was predicted using eight (8) selected models from the literature. Models that account for the aggregate size and shear span to depth ratio resulted in shear strength ratios of 1.29, 0.91, 1.08, and 1.20 for Bažant and Becq-Giraudon, 2002, Zsutty, 1968, Xu et al., 2012, and Gastebled and May, 2001, which are almost similar outcomes to the experimental results. |
| format | Article |
| id | doaj-art-e3f1d454494d49d999419dbcfb45bfec |
| institution | Kabale University |
| issn | 1687-8442 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
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| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-e3f1d454494d49d999419dbcfb45bfec2025-02-03T06:00:55ZengWileyAdvances in Materials Science and Engineering1687-84422022-01-01202210.1155/2022/6804155Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete AggregateBrian Jacks Odero0Raphael N. Mutuku1Timothy Nyomboi2Zachary Abiero Gariy3Pan African University Institute of Basic Sciences Technology and InnovationTechnical University of MombasaPan African University Institute of Basic Sciences Technology and InnovationJomo Kenyatta University of Agriculture and TechnologyThe use of concrete mixes with recycled materials has gained traction in research communities. However, the major drawback of the recycled concrete aggregate (RCA) has been the contribution of the cement paste mortar attached to the surface. The quantity of surface-attached mortar on the virgin aggregate dominates and defines the shear performance of concrete beams. Concrete shear failure is usually abrupt and catastrophic, especially in concrete beams without shear reinforcement. The effectiveness of the maximum size of RCA for the performance of untreated and treated with pozzolanic cement and rice husk ash (RHA) slurry was investigated. A total of sixteen (16) beams containing RCA of four (4) maximum sizes, 10, 14, 20, and 25 mm, were prepared and tested after 28 days. The beams were loaded in shear using shear span-depth ratios of 1.25 and 2.50. The results showed that the shear strength of the beams increases as the aggregate size increases to a maximum size of 20 mm, beyond which the shear strength reduces. It was attributed to the attached mortar, which increased as the size of the aggregate increased, creating a weak zone for shear failure in the concrete. In addition, RCA pretreatment using slurry-containing cement and RHA strengthened the attached mortar on the aggregate surface. It resulted in a dense and more compact aggregate that slightly improved the shear strength by about 2.2% for beams containing 20 mm RCA size. The ultimate shear strength of the experimental work in the study was predicted using eight (8) selected models from the literature. Models that account for the aggregate size and shear span to depth ratio resulted in shear strength ratios of 1.29, 0.91, 1.08, and 1.20 for Bažant and Becq-Giraudon, 2002, Zsutty, 1968, Xu et al., 2012, and Gastebled and May, 2001, which are almost similar outcomes to the experimental results.http://dx.doi.org/10.1155/2022/6804155 |
| spellingShingle | Brian Jacks Odero Raphael N. Mutuku Timothy Nyomboi Zachary Abiero Gariy Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate Advances in Materials Science and Engineering |
| title | Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate |
| title_full | Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate |
| title_fullStr | Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate |
| title_full_unstemmed | Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate |
| title_short | Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate |
| title_sort | shear performance of concrete beams with a maximum size of recycled concrete aggregate |
| url | http://dx.doi.org/10.1155/2022/6804155 |
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