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ADAA APRIL 2015 05 Another landmark project using fly ash - Gerringongs Omega Bridge and the Winner is Fly Ash The Omega Bridge on the south coast of NSW Gerringong officially opened on the 13th of February this year. At over 340 metres long the bridge is the lynchpin for the 329 million Princess Highway upgrade between Gerringong and Gerroa. Interestingly the Bridge was constructed using the same method as the Sea Cliff Bridge construction in 2005. www.adaa.asn.auuploadsdefaultfilesadaa-case_study_8.pdf The method used is known as incremental launching in which segments are pushed and added to the bridge so to connect with the previous segment. This method reduced the amount of cranes needed to assemble the bridge while at the same time decreasing the environmental impact on the nearby Werri Lagoon. Due to the massive weight of the piers which support the bridge a concrete mix was developed containing 30 fly ash. The inclusion of the fly ash mix increased workability working time and ensured that the core temperatures and temperature gradients of the concrete were kept at a sufficient level. To read more about the project visit httpwww.abc.net.aulocalstories201409124086323.htm With the Olympics just around the corner the developers for the Rio De Janeiro Brazil Olympics are facing the task of completing the 34 venues and stadiums spread across the city by 2016. In 2013 the United Nations Environment Programme UNEP agreed that the construction of the new venues needed to include by-products such as fly ash and achieve 100 local sustainability targets. The main by-products used in the construction include fly ash silica fume and iron and steel slags. When the UNEP created the guidelines for developers researchers at the Federal University of Rio de Janeiro began testing the potential use of more locally available pozzolans such as sugar cane ash bagasse ash rice husk and believe it or not ash from burned sewage sludge. Results showed that using a 10-15 blend of bagasse ash as a cement replacement actually increased the compressive strength of the concrete. The research resulted in multiple by-product and pozzolanic research developments. The University researchers concluded that the mechanical hydration and rheological performance of the mixtures presented in this paper could be a blueprint for further development of ecological concrete. To read more about the use of by-products in the construction of the venues please visit httpgoo.glNxFPvd