Title : INNOVATIVE CONCRETE TECHNOLOGY SOLUTIONS FOR SLUMP RETENTION AND HIGH EARLY STRENGTH
Authors : Jürg Schlumpf
Publication : 23 - 26 October 2013
Volume :
Pages :
Price : 250
Abstract : It is a great challenge to improve sustainability of concrete. Strongest argument for concrete as the most important building material is its durability behavior over more than 100 years. Longer the service life, lower the maintenance and better the sustainability - nothing easier as that! But to improve energy efficiency and climate protection, concrete mix has to adapt durable recipes. Reduction and replacement of pure Portland cement and use of crushed aggregates are two of the key actions. By using these materials, concrete behavior change completely, very often water reduction is no longer an issues, but segregation and bleeding, slump retention for the required time period becomes a major topic. Finally keeping the construction speed by achieving the needed compressive early strength is a challenging task.For the implementation of durable and sustainable concrete, new concrete technology instruments have to be in place. Design by volume paste instead of content of cement, newest concrete admixture technologies as special slump keepers and high performing concrete accelerator in combination with practical tool to measure the progress of sustainability are key actions to fulfill the request of sustainable durability.