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Strength of reinforced concrete beam using dual grade concrete

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Author: 
Rohan S. Shreshthi and Chetan S. Patil
Abstract: 

The purpose of this work was to investigate the use two different grades of concrete in one single structural beam unit. A beam is specified with two zones as compression zone and tension zone. Compression zone arise at top part of neutral axis and tension zone arise at bottom part of neutral axis. Here in case of reinforced concrete beam, steel plays a vital role to support especially in tension zone. Here, to simply investigate, the process of using high grade concrete above Neutral axis and low-grade concrete below neutral axis by using nominal steel is done. For this experimental project, High grade concrete of M 60 is used and Low-grade concrete of M 20 is used.
For getting pre-execution remark, we have casted concrete cubes with dual grade concrete by keeping 30 mm interval along depth, and separate M 20 and M60 grade cubes. The result shows that dual grade concrete cubes achieve average strength of 100+30% as compare to M20 for 7 days and up to 55 to 60 % as compare to M60 for 7 days. And, average strength achieved is up to 70 % of M60 for 28 days. And average strength achieved is 100+55% of M20 for 28 days. Further, PC beams and Reinforced Concrete beams with double grade concrete has been casted.

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