Rubberized concrete : need of good environment

Abstract

It is argued that the recycling material may significantly contribute to sustain the environment and as a result enhance the human life in a positive way.. The main objective of this project is to find out optimal powder rubber which we can partially replace the sand in mixtures of concrete in order to increase ameliorative effects on impact resistance and make it suitable for specific engineering applications. Powder rubber of tyres ranging less than 0.4mm in size is used in this project. Different percentages of rubber particles, from (0% to 20%) are used and for each percentage, the suitable amount of sand is investigated in order to achieve the best hardened performances. In particular the following characteristics are examined: compressive strength, splitting tensile strength and impact load. Moreover, impact testing program was applied to specific specimens, cylinder of diameter 200 mm and thickness 50 mm, according to ACI committee 544 procedures. From this test we can determine the number of blows for first cricks and ultimate failure. Experimental results are compared with the reference max (without rubber aggregates). Test results show that decrease in concrete strength (compressive, tensile, and impact) with an increase in crumb rubber in the mixture comparing with the reference mix.