Cement, Energy & Environment

BRUKSHYA MELA SAPLING DISTRIBUTION DETAILS PLANTATION & SAPLINGS DISTRIBUTED TO NEARBY VILLAGERS FREE OF COSTS 20000 --- en 17000 14164 (!) z 14000 ::::i Q,. 11000 <t en 8000 LL. 0 5000 0 z 2000 -1 000 2008-2009 2009-2010 2010-2011 2011-2012 2012-2013 YEAR SAVE PLANTS NOW WILL SAVE LATIER, TO HAVE A GOOD SCENERY, THERE SHOULD BE ENOUGH GREENERY! Utilization of Nano Materials in Cement and Concrete for Sustainable Development MMA/i Dr. S. Harsh Ashwani Pahuja National Council for Cement and Building Materials Ballabgarh The manufacture of Portland cement is an energy intensive process and releases approximately one tonne of C0 2 per tonne of Portland cement which is added to industria lly released C0 2 causing global warming . At the same time cement industry has also been contributing greatly towards gainful utilization and disposal of erstwhile waste materials which are now referred to as cement replacement materials or mineral admixtures such as fl y ash and blast furnace slag through manufacture of blended cements, i.e., Portland pozzolana and Portland slag cement. Fly ash and granulated blast furnace slag not only bring down the proportion of clinker in cement but also increase the durability of concrete. The growing concern for sustainability demands that further improvements are made in the performance of cement and concrete at lower clinker contents so as to save on raw materials and fuel and also bring down the C0 2 emissions from cement manufacture. Developments on use of nano sized materials in cement and concrete can result in properties significant for conservation of energy and raw materials and sustainable constructions. Applications of nanosciences and nanotechnology in development of cement, alternate cementitious binders and concrete are being made through the following routes, • Nano cements & eco-friendly, high performance cements/ binders manufactured with lower clinker content • Improvement in cement and concrete performance through incorporation of nano– particles and chemical admixture • Better understanding of cementitious materials through nanoscale investigations of cement hydration reactions and hydration products to 5