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10The present day research is focussed on development of alternative binder materials to Ordinary Portland Cement (OPC) due to huge 11 emissions of green house gases associated with production of OPC. GGBFS-FA based geopolymer binders are an innovative alternative 12 to OPC which can obtain high strengths apart from being eco-friendly; since its production does not involve high energy and also con-13 tributes to sustainability by using the industrial waste materials. Steel slag, an industrial by-product obtained from manufacture of steel 14 can be identified as an alternative to natural aggregates for concrete production, since there is a possibility of acute shortage of natural 15 aggregates in future. The present study is conducted to evaluate the performance of weathered steel slag coarse aggregates in GGBFS-FA 16 based geopolymer concrete. GGBFS-FA geopolymer concrete with steel slag coarse aggregates are prepared by replacing natural granite 17 aggregates at different replacement levels i.e. 0%, 25%, 50%, 75% and 100% (by volume) and various fresh and mechanical properties are 18 studied. The flexural fatigue behaviour of GGBFS-FA geopolymer concrete with steel slag is also studied in detail. Efforts are also made 19 to model the probabilistic distribution of fatigue data of GGBFS-FA geopolymer concrete at different stress levels using two parameters 20 Weibull distribution. The results indicated that incorporation of steel slag in GGBFS-FA geopolymer concrete resulted in slight reduc-21 tion in mechanical strength. The water absorption and volume of permeable voids displayed higher values with inclusion of steel slag. 22Reduction in number of cycles for fatigue failure was observed in geopolymer concrete mixes containing steel slag as compared to granite 23 aggregates. Overall, the performance of steel slag was found to be satisfactory for structural and pavement application and steel slag can 24 be recognised as new construction material. 25

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The present investigation attempts a detailed study of mechanical properties and fatigue characteristics of a new class of Alkali Activated Slag Concrete (AASC) mixes incorporating Copper Slag (CS) as fine aggregates. The natural river sand is replaced with Copper Slag, upto 100% (by volume) as fine aggregate in these AASC mixes. The behavior of plain concrete prisms, cast with this range of AASC mixes under dynamic cyclic loads with sand/CS fine aggregates is studied and is compared with conventional OPC-based concrete specimens. The results indicate that incorporation of CS even upto 100% as fine aggregates, did not have any adverse effects on the mechanical properties of AASC mixes. The AASC mixes with CS displayed slightly better fatigue performance as compared to AASC mix with river sand. An attempt is also made herein to statistically describe the fatigue life data of AASC mixes using a 2-parameter Weibull distribution.

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