RECYCLED CONCRETE BLOCKS-ECOFRIENDLY AND COST-EFFECTIVE SOLUTION FOR MASONRY CONSTRUCTION

 

Introduction:

In this rapidly changing world where every sector is expanding and growing, the construction industry is the second largest industry. It produces around 11% of the GDP through investments. The total Municipal Solid Waste developed by India is around 100,000 Metric Tons. 25% percent of this MSW is produced through construction and demolition. This waste through construction and demolition in towns and cities is through destruction of old buildings and structures, renovations of existing buildings, excavation, construction of new structures, etc.


Construction demolition waste generated in major cities in India


India produces almost 25-30 MT/year of construction and demolition waste. Of 12 million tons of construction and demolition waste, if 30% is considered as concrete and 50% is considered as coarse aggregate, the available recyclable concrete aggregate (RCA) is of the order 1.8 million tons annually. The remaining waste is dumped in landfills and empty areas. Statistically, there are only 95 constructed landfill sites in India and around 1285 landfill are identified. This leads to challenges faced by the environment. Hence, construction and demolition waste should not be considered unusable and should be recycled and reused as said by the Central Pollution Control Board, Government of India.


Present method of recycling and reusing of C&D waste:

Concrete waste can be reused as cement replacement material in concrete blocks, as fine aggregate replacement. Mortar production can be done through fine recycled concrete aggregate. Studies show that 20% of fine aggregate replaced by RCA show better results. 31% of construction and demolition waste consists of brick waste. Thus waste clay bricks can be used in mortar and concrete.


METHODOLOGY:



Trial Mix:

The trial mix for producing recycled aggregate concrete, 45 days old concrete blocks are used. Various sizes of aggregates are formed by crushing concrete blocks and sieving them. Different sieves are used for fine and coarse form of aggregate.


Tests Conducted on Concrete:

Various tests are conducted on the concrete to test its strength. The compressive strength, split tensile strength and flexural strength are tested through different experiments.







Test Results:


Conclusion:

Using recycled concrete aggregate is a unique and ecologically safe solution. As demolished concrete is available freely the only economic expenditure will be the transportation and crushing. This is an environmentally helpful option than the conventional natural aggregate concrete. 


Credits:

Bhakti Gujarathi

S.Y.B.Tech

Manufacturing Science and Engineering


References:

https://www.researchgate.net/publication/344781726

‘Municipal Solid Waste Annual Report 2014-15’, published by Central Pollution Control Board, Government of India.

 ‘Management of Municipal Solid Waste’ status report published by Central Pollution Control Board, Government of India.

 Central Pollution Control Board Bulletin VOL.-I, JULY 2016


NOTE:

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