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This paper reports mechanical and durability studies of blended pozzolonic concretes. Blended concretes were produced by partially replacing the cement by 25 percent fly ash and the Natural Coarse Aggregates (NCA) were replaced by Recycled Coarse Aggregates (RCA) in different fractions of 0, 25, 50, 75 and 100 percentages. Mechanical properties like Compressive Strength, Stress Strain behavior, and Modulus Of Rupture (MOR) of concrete and durability studies like carbonation depth and accelerated corrosion are reported. Experimental studies revealed that the compressive strength, Stress Strain Curves, Modulus of rupture of blended concrete having a resemblance to conventional concrete with NCA, at an optimum replacement level of 25 percent of Fly ash by weight of cement and 75 percent RCA by weight of NCA. It is observed that the carbonation depths were increased with increased content of RCA. Charge Deterioration Factors (ChDF) for a given effective cover, at a given duration of charging for NCA are lesser than that of RCA, which demonstrates corrosion resistance of NCA when compared to other mixes. |
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