Flexural Stress-Strain Behavior of RC Beams Made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete: Part-1: 1:2:4 Ratio
Occupancy, particularly in urban areas, requires more space than ever. Space constraints need erection of high rise buildings in place of short height buildings. This need demolishing of old structures which creates huge quantities of demolished concrete. One of its best disposals is its use in new concrete. Therefore, this research work uses 50% replacement of natural coarse aggregates with coarse aggregates from old concrete to study the flexural stress-strain behavior of reinforced concrete beams. Total of 12 reinforced concrete beams (900x150x150 mm) were cast with 2#4 bars in tension and 2#4 bars in compression zones. Ordinary Portland cement with hill sand and crush aggregate was used in 1:2:4 proportions. Water cement ratio used is 0.54. The beams were cast in two batches, one with 100% natural aggregates and another with 50% natural coarse aggregates replaced with coarse aggregates from old concrete. In each batch 3 beams were cured for 7 and 28 days respectively. After curing all beams were tested with central point load. The beams were monitored at regular intervals for load, displacement, strain and load until first crack. The beams under study were compared with the controlled specimen. The results were in good agreement with the normal concrete specimen. Maximum reduction in flexural stress is recorded as 8.8% for 7-day cured beams and 5.52% for 28-day cured specimen. Thus, the use of coarse aggregates from demolished concrete in new concrete is proved to be promising partial replacement of coarse aggregate in terms of flexural stress-strain relationship.
Keywords:flexural stress, green concrete, old concrete, recycled coarse aggregates, strain
B. A. Memon, “Recent Development on Use of Demolished Concrete as Coarse Aggregates”, International Journal of Emerging Technology and Innovative Engineering, Vol. 2, No. 1, pp. 1–11, 2016
S. Tanwani, B. A. Memon, “Relationship between Weight and Tensile Strength of Concrete Cylinders Made by Partial Replacement of Coarse Aggregates from Old Concrete”, International Journal of Engineering Inventions, Vol. 5, No. 06, pp. 1-9, 2016
S. Tanwani, B. A. Memon, “Tensile Strength of Concrete Cylinders Made By Partial Replacement Of Natural Coarse Aggregates With Coarse Aggregates From Old Concrete”, International Journal of Emerging Technology and Innovative Engineering, Vol. 1, No. 4, 2015
M. Oad, B. A. Memon, “Compressive Strength of Concrete Cylinders using Coarse Aggregates from Old Concrete”, 1st National Conference on Civil Engineering (NCCE 2013-14)-(Modern Trends and Advancements), April 28–29, 2014
B. A. Memon, G. S. Bhatti. “Flexural Behavior of Beam made by Partial Replacement of Natural Aggregates with Coarse Aggregates from Old Concrete”, International Journal of Engineering Sciences & Research Technology, Vol. 3, No. 5, pp. 52-61, 2014
D. C. L. Teo, M. A. Mannan, J. V. Kurian, “Flexural Behavior of Reinforced Light Weight Concrete Beams Made with Oil Palm Shell”, Journal of Advanced Concrete Technology, Vol. 4, No. 3, pp. 459-468, 2006 DOI: https://doi.org/10.3151/jact.4.459
J. M. Khatib, S. Shariff, E. M. Negim, “Effect of Incorporating Foamed Glass on the Flexural Behavior of Reinforced Concrete Beam”, World Applied Sciences Journal, Vol. 19, No. 1, pp. 47-51, 2012
S. Kumaravel, S. Thirugnanasambandam, “Flexural “Behavior of Reinforced Low Calcium Fly Ash based Geopolymer Concrete Beam”, Global Journal of Researches in Engineering - Civil and Structural Engineering, Vol. 13, No. 8, pp. 8-13, 2013
M. A. Adam, M.Said, A. A. Mahmoud, A. S. Shanour, “Analytical and experimental flexural behavior of concrete beams reinforced with glass fiber reinforced polymers bars”. Construction and Building Materials, Vol. 84, pp. 354-366, 2015 DOI: https://doi.org/10.1016/j.conbuildmat.2015.03.057
S. Al-Obaidi, Behavior of Reinforced Concrete Beams Retrofitted in Flexure Using CFRP-NSM Technique, MSc Thesis, Portland State University, 2015
M. Mithra, P. Ramanathan, P. Muthupriya, R. Venkatasubramani, “Flexural Behavior of Reinforced Self Compacting Concrete Containing GGBFS”. International Journal of Engineering and Innovative Technology, Vol. 1, No. 4, pp. 124-129, 2012
N Harsha Vardan, K. Kartheek Babu, A. Annadurai, “Enhancing Flexural Capacity of Steel Fiber Reinforced High Strength Concrete Beams”, International Journal of Scientific Research Engineering Technology, Vol. 2, No. 2, pp. 57-61, 2016
S. P. Sangeetha, P. S. Joanna, “Behavior of Reinforced Concrete Beams with Partial Replacement of GGBS”, American Journal of Engineering Research, Vol. 3, No. 1, pp. 119-127, 2014
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