Title : UTILIZATION OF SUPPLEMENTARY CEMENTITIOUS MATERIAL AS ECO - FRIENDLY ROAD CONSTRUCTION
Authors : Sh.J.B. Sengupta and Sh. Dinesh Ganvir
Publication : 5-9 December 2010
Volume :
Pages : 26-52
Price : 250
Abstract : Concrete is responsible for 7-10% of CO2 emissions worldwide, making it the biggest climate change culprit outside of transportation and electricity-generation. To reduce the CO2 emission and heat of hydration of concrete, supplementary cementitious material (SCM) are added in concrete. The durability and long term performance are the main subject of concerned while adding SCM without scarifying the strength and to make it economic and environmental friendly. For sustainable development in any developing country like India, often resource crunch is faced in the execution of development programmes, such as road development for further connectivity of areas. This crunch has led many to search for the cheaper and unconventional alternatives. With a view to conserve the precious conventional binders in road construction, alternate binders have been investigated in laboratory using industrial byproducts such as cement fly ash and lime granulated blast furnace slag (GBFS). Based on the laboratory output, fly ash has now become a resource material for many types of use in road construction. Two varieties of slag from steel industry, i.e. “air-cooled” and “water- quenched” Granulated Blast Furnace Slag (GBFS) has been utilized on experimental basis as (i) road aggregates; and (ii) for producing “slag-cement” . Also the use of lime –GBFS binder has been made technically feasible for road construction. The primary condition of such utilization required that the material is made available at the user doorsteps ‘free of cost’ and in ready to use form’, of ‘certified quality’ and without hassles of further processing. Mostly these materials are economical to use at location closer to their production centers. Fly ash and GBFS material are available within an economical haulage radius from thermal power plants and steel plants. It is concluded that for road construction work, sustainable development is achievable through the judicious utilization of locally available solid industrial by-products.