Experimental Study on Voided Reinforced Concrete Beams with Polythene Balls

International Conference on Civil Engineering and Infrastructural Issues in Emerging Economies 2017

土木建筑工程;经济学

Sivaneshan, P.^1 ; Harishankar, S.^1

School of Civil Engineering, SASTRA University, Thanjavur

613 401, India^1

关键词: Compression zones;    Polythene balls;    Present situation;    Reinforced concrete beams;    Simply supported;    Steel reinforcements;    Stress transfer;    Structural elements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012031/pdf
DOI  :  10.1088/1755-1315/80/1/012031

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The primary component in any structure is concrete, that exist in buildings and bridges. In present situation, a serious problems faced by construction industry is exhaustive use of raw materials. Recent times, various methods are being adopted to limit the use of concrete. In structural elements like beams, polythene balls can be induced to reduce the usage of concrete. A simply supported reinforced concrete beam has two zones, one above neutral axis and other below neutral axis. The region below neutral axis is in tension and above neutral axis is in compression. As concrete is weak in tension, steel reinforcements are provided in tension zone. The concrete below the neutral axis acts as a stress transfer medium between the compression zone and tension zone. The concrete above the neutral axis takes minimum stress so that we could partially replace the concrete above neutral axis by creating air voids using recycled polythene balls. Polythene balls of varying diameters of 75 mm, 65 mm and 35 mm were partially replaced in compression zone. Hence the usage of concrete in beams and self-weight of the beams got reduced considerably. The Load carrying capacity, Deflection of beams and crack patterns were studied and compared with conventional reinforced concrete beams.