Effectiveness Of Kadapa Marble Dust In Recycle Aggregate Concrete

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G. Vishnu Vardhan and J. Karthikeyan

Abstract

Sustainability and availability of limited natural resources are few of the great concerns over the world. The concrete-jungle has occupied 2nd largest area after the water on the globe, but it is the time to look for alternatives for Ordinary Portland Cement. The manufacturing of 1 ton of cement can produce approximately same amount of CO2 which causes huge global warming. In order to reduce these adverse environmental effects, the researchers were started research on replacing OPC partially or fully with supplementary cementitious materials such as fly ash, blast furnace slag, metakaolin, and marble-dust. The present study was aimed to focus on replacing Ordinary Portland Cement with Kadapa marble dust and natural aggregates with recycled concrete aggregates for sustainable infrastructure. The present article focused on evaluating the effect of replacing Ordinary Portland Cement with marble-dust at a replacement dosage of 0, 5, 10, 15, 20, 25 and 30% by weight of cement and replacing natural aggregates with recycled aggregates at a dosage of 0, 25, 50, 75 and 100%. Firstly, a set of recycled aggregate concrete mixes were prepared with different dosages (0, 0.1, 0.2, 0.3, 0.4 and 0.5% by weight of binder) of super absorbent polymer and an optimum dosage of this polymer was determined based on 28-days compressive strength. Secondly, a set of cubic specimens were prepared with marble dust and recycled aggregates and subjected to curing for 7, 14, 28, 60 and 90-days. Thirdly, the optimization of dosage of marble-dust was carried out based on 90-days compressive strength. Later, a relation between 28 and 90-days compressive strengths was developed using a simple linear regression analysis. In addition, the microstructural analysis was carried out using scanning electron microscope and X-ray diffraction and finally a dosage of 15% was recommended for marble dust to replace Ordinary Portland Cement for recycled aggregate concrete.

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