Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates
This paper is the outcome of experiments on the shear performance of reinforced concrete beams with approved composite-recycled aggregates. The strength grade of composite-recycled aggregate concrete (CRAC) was between 30 MPa and 60 MPa. The shear span-to-depth ratio varied from 1 to 3. The adaptabi...
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MDPI AG
2020-04-01
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| author | Changyong Li Na Liang Minglei Zhao Kunqi Yao Jie Li Xiaoke Li |
| author_facet | Changyong Li Na Liang Minglei Zhao Kunqi Yao Jie Li Xiaoke Li |
| author_sort | Changyong Li |
| collection | DOAJ |
| description | This paper is the outcome of experiments on the shear performance of reinforced concrete beams with approved composite-recycled aggregates. The strength grade of composite-recycled aggregate concrete (CRAC) was between 30 MPa and 60 MPa. The shear span-to-depth ratio varied from 1 to 3. The adaptability of HRB400 rebar, with critical yield strength of 400 MPa, used as stirrups was also verified. As the composite technology overcame the shortcomings of recycled coarse aggregate, CRAC had similar mechanical properties with those of conventional concrete. Details on the shear behaviors of test beams under a four-point loading test are presented. The results indicated that the changes of CRAC strain, stirrup strain, and shear-crack width depended on the failure patterns, which are controlled by the shear-span to depth ratio. The stirrups yield at the failure of reinforced CRAC beams. The shear cracking resistance and the shear capacity of reinforced CRAC beams can be predicted by the statistical equations. Based on the design codes GB50010, ACI318-19, Model Code 2010 and DIN-1045-1-2008 for conventional reinforced concrete beams, the shear strengths provided by CRAC and stirrups are statistical analyzed. The rationality of the design equations is examined by the utilization level of shear strength provided by CRAC. The maximum shear-crack widths are extracted from the test data of reinforced CRAC beams at normal service state. Comparatively, by specifying the lower limit of shear strength provided by the CRAC with various shear-span to depth ratios, China code GB50010 gives a rational method for utilizing CRAC. Under the premise that the design of shear capacity would give considerations to meet the normal serviceability, the factored strength of HRB400 rebar should be 360 MPa for the calculation of shear strength provided by stirrups. The design methods in codes of GB50010, ACI318-19 and Model Code 2010 are conservative for the shear capacity of reinforced CRAC beams. |
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| spelling | doaj.art-74163469f3d242d9baff5e6505c2cba32023-11-19T20:48:54ZengMDPI AGMaterials1996-19442020-04-01137171110.3390/ma13071711Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled AggregatesChangyong Li0Na Liang1Minglei Zhao2Kunqi Yao3Jie Li4Xiaoke Li5International Joint Research Lab for Eco-building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaInternational Joint Research Lab for Eco-building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Engineering, RMIT University, Melbourne, VIC 3003, AustraliaInternational Joint Research Lab for Eco-building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Engineering, RMIT University, Melbourne, VIC 3003, AustraliaSchool of Civil Engineering and Communications, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaThis paper is the outcome of experiments on the shear performance of reinforced concrete beams with approved composite-recycled aggregates. The strength grade of composite-recycled aggregate concrete (CRAC) was between 30 MPa and 60 MPa. The shear span-to-depth ratio varied from 1 to 3. The adaptability of HRB400 rebar, with critical yield strength of 400 MPa, used as stirrups was also verified. As the composite technology overcame the shortcomings of recycled coarse aggregate, CRAC had similar mechanical properties with those of conventional concrete. Details on the shear behaviors of test beams under a four-point loading test are presented. The results indicated that the changes of CRAC strain, stirrup strain, and shear-crack width depended on the failure patterns, which are controlled by the shear-span to depth ratio. The stirrups yield at the failure of reinforced CRAC beams. The shear cracking resistance and the shear capacity of reinforced CRAC beams can be predicted by the statistical equations. Based on the design codes GB50010, ACI318-19, Model Code 2010 and DIN-1045-1-2008 for conventional reinforced concrete beams, the shear strengths provided by CRAC and stirrups are statistical analyzed. The rationality of the design equations is examined by the utilization level of shear strength provided by CRAC. The maximum shear-crack widths are extracted from the test data of reinforced CRAC beams at normal service state. Comparatively, by specifying the lower limit of shear strength provided by the CRAC with various shear-span to depth ratios, China code GB50010 gives a rational method for utilizing CRAC. Under the premise that the design of shear capacity would give considerations to meet the normal serviceability, the factored strength of HRB400 rebar should be 360 MPa for the calculation of shear strength provided by stirrups. The design methods in codes of GB50010, ACI318-19 and Model Code 2010 are conservative for the shear capacity of reinforced CRAC beams.https://www.mdpi.com/1996-1944/13/7/1711composite-recycled aggregate concrete (CRAC)reinforced concrete beamstirrupsshear strengthshear-crack widthshear capacity |
| spellingShingle | Changyong Li Na Liang Minglei Zhao Kunqi Yao Jie Li Xiaoke Li Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates Materials composite-recycled aggregate concrete (CRAC) reinforced concrete beam stirrups shear strength shear-crack width shear capacity |
| title | Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates |
| title_full | Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates |
| title_fullStr | Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates |
| title_full_unstemmed | Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates |
| title_short | Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates |
| title_sort | shear performance of reinforced concrete beams affected by satisfactory composite recycled aggregates |
| topic | composite-recycled aggregate concrete (CRAC) reinforced concrete beam stirrups shear strength shear-crack width shear capacity |
| url | https://www.mdpi.com/1996-1944/13/7/1711 |
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