Studies on eco-friendly concrete incorporating industrial waste as aggregates

Abstract

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

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

“…FA is in the form of spherical particles composed of many phases-amorphous and also crystalline compounds, mostly silicon, calcium, aluminium and iron oxides. The versatility of fly ash for production of different types of cements is attributed to its physical features, chemical properties and phase composition [77][78][79].…”

Behaviour of concrete by using artificial aggregates a review

“…Hence there is a need for the production of artificial aggregate which meets present requirement of the construction industry. Weight loss and reduction in strength was monitored up to 56 days and durability test was conducted on normal cured specimen for 28days continuous immersion in NACL solution from the results it show that the present manufactured aggregate NitendraPalankar et al (2015) [13] in this project binder materials to ordinary Portland cement due to some amount of green house gases combined with production opc. GGBFS-FA geopolymer of concrete with steel slag coarse aggregate are prepared by recycling the natural granite aggregate at different percentage replacement of 0%, 25%,50%,75% and 100% of physical and mechanic properties.…”

Sustainability Requirements of Concrete Structures

“…The new research conducted by Palankar and et al is focused on the development of binder material alternatives instead of Ordinary Portland Cement (OPC) [21]. There are geopolymers binders which can be used as an alternative to OPC and these materials obtain high strengths, being eco-friendly and do not involve high energy for hydration.…”

“…In concrete industry, it is supposed that the quantity of Portland cement used has been reduced by replacing it with the cementitious materials like fly ash, granulated blast furnace slag. References [1,10,21] referred to the importance of cementitious additives for the concrete sustainability.…”