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Abstract
Nowadays the greatest crisis faced by the construction industry is the availability of sand. As the digging of river sand destroys the river bed and causes danger for people using the river, digging of river sand has been made illegal in most rivers. So getting river sand is really expensive nowadays as its availability is very limited. So more importance is now given nowadays for replacement of river sand as fine aggregate. Mostly used nowadays in Kerala is M-Sand. In our project we are trying to replace sand with crushed used (demolished) concrete. The concrete created with this aggregate showed almost the same strength of concrete with natural sand. This is not only much cheaper than river sand and M sand, but also helps to decrease the disposal of construction wastes, which environmentalists say degrades the land. So in the end use of this crushed concrete is beneficial not only to the contractor but also to our environment. This is an experimental study to see the feasibility of C&D wastes as fine aggregate in concrete.
Highlights
Comparing the results of crushed construction and demolition (C&D) wastes with the normal sand used, the fineness of the C&D wastes is more than the later
Comparing the compressive stress of normal M20 grade concrete with concrete made with C&D wastes as a replacement to sand, it seems the latter is a little lagging behind the normal concrete
Test results indicate that the concrete made using crushed C&D wastes gives almost as much as strength as normal concrete (Figures 1-5)
Summary
In the USA, the construction waste produced from building demolition alone is estimated to be 123 million tons per year [2]. Aggregate should not contain any constituent which affects the hardening of the cement and durability of the hardened concrete adversely It should be free from organic matter which reduces the hydraulic activity of cement and affects its normal setting and hardening. Classification of aggregate: Aggregates are classified based upon their size as a) Coarse aggregate and b) Fine aggregate a) Coarse aggregate: Coarse aggregate is material which passes through 80 mm sieve and retained on a 4.75 mm sieve It may be uncrushed gravel if it results from the natural disintegration of rock or crushed stone or crushed gravel if it is produced by crushing hard stone, gravel. In this project we are going to compare the results of concrete with crushed C&D wasted, with normal concrete by conducting following tests
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