Enhancement Conventional Concrete using locally available Waste Material

Abstract

Concrete is a nifty construction material. Concrete has some attractive properties when it is newly mixed, it is plastic and malleable, but when it is hardened it becomes very strong and durable. These qualities make concrete unique from other materials. For the reason that concrete is the main construction material across the world and widely used in all kinds of civil engineering works, such as for building skyscrapers, dams, bridges,barrage, highways, and houses. As we know that aggregate represents about 70-80% of concrete elements, so it will be useful to recycle the aggregate for construction works and also to solve the environmental problems. Iraq is suffering a lot of the problem of rubble(debris)  as a result of the wars that occurred during the past years, on the other hand in some places have been converted buildings from residential buildings to commercial buildings, so these destroyed buildings constitute the problem of environmental pollutants. To minimize the trouble of excess of waste material it is suitable steps to utilize the recycled aggregates provide that the desired final product will meet the standards. In the present investigation adjustments to traditional mix designs of concrete using locally available waste material was studied experimentally.The experimental program consisted of nine mixes with mix proportions [1:2:4] and constant slump equal to (13) cm were constructed and tested. These nine mixes classified into three groups based on the types of sand and gravel used in all mixes.The experimental results showed that, the optimum mix was Mix₂ in Group (B) with (cement : 50% naturally sand and 50% crushed recycled concrete as sand : crushed boulder as gravel), which enhance the properties of the existing concrete , such that, increasing compressive strength by (18.6%), flexural strength by (8.3%) and splitting strength by (28.9%), as comparing with Mix₁ (Reference mix). 

Keywords

• Conventional concrete,Concrete locally waste material,Compressive strength,Flexural strength,Splitting strength

References

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