One essential requirement of precast concrete is a high early age strength, usually reached by a high content of fine Portland cement (OPC). In times of climate change, however a reduction of the global warming potential GWP and demand of primary energy PE of concrete is a desirable goal that can be reached by a low content of OPC. In this study it is shown, how mineral micro-fillers (MFs) in combination with so-called eco-fillers (EFs) can help to reduce the content of OPC of precast concrete leading to a reduction of GWP (up to -24 %) and PE (-14 %) while keeping an early age strength as high as that of a standard precast concrete. It is analysed how different fillers, depending on their fineness and type, influence the early- age- (i.e. 8 h with heat treatment), 28 d- strength, workability and demand of superplasticizer. Powder-materials of limestones, dolomites and ground granulated blast-furnace slag were used as very fine MFs (d50 < 3 µm) and EFs (3 µm ≤ d50 ≤ 30 µm).
|Title of host publication||Concrete with Supplementary Cementitious materials|
|Publication status||Published - Aug 2016|
|Event||2016 International RILEM Conference Materials Systems and Structures in Civil Engineering - Lungby, Lungby, Denmark|
Duration: 15 Aug 2016 → 29 Aug 2016
|Conference||2016 International RILEM Conference Materials Systems and Structures in Civil Engineering|
|Abbreviated title||MSSCE 2016|
|Period||15/08/16 → 29/08/16|