EFFECT OF WASTE MINERAL ADDITIVES ON FLOW STABILITY OVER TIME IN SELF-COMPACTING CONCRETE MIXES WITH LOW CLINKER CONTENT

• Main Authors: Anna M. Grabiec, Daniel Zawal, Wojciech Kostrzewski
• Format: Article
• Language: English
• Published: Polish Society of Ecological Engineering (PTIE) 2015-09-01
• Series: Journal of Ecological Engineering
• Subjects: self-compacting concrete; waste mineral additive; sustainability of civil engineering
• Online Access: http://www.journalssystem.com/jeeng/EFFECT-OF-WASTE-MINERAL-ADDITIVES-ON-FLOW-STABILITY-OVER-TIME-IN-SELF-COMPACTING-CONCRETE-MIXES-WITH-LOW-CLINKER-CONTENT,59375,0,2.html

Contemporary solutions in concrete technology are varied, and consist in e.g. the use of new generation concretes, including the most spectacular achievement of the 1990s – self-compacting concrete (SCC) being the subject of continuous research, as well as protection of the environment against excessive anthropogenic pressures, such as carbon dioxide which is a major emission substance from the cement industry. The studies analysed the possibilities for replacing part of the clinker binder (cement CEM I 42.5 R) in self-compacting concrete with three types of waste mineral additives: fly ash, limestone powder, and granite powder. Focus was placed on key technological characteristics of concrete mixes: air content and rheological properties, maximal diameter of slump-flow and changes thereof over time, as well as the mix’s flow time into the 500 mm diameter, determining the flow dynamics. 28-day compressive strength of the concrete was recognised as a secondary property which in self-compacting concretes results from achieving the right range of the mix’s rheological properties. Concretes were produced using gravel-sand aggregate in 3-fraction composition and a high-efficiency superplasticiser. The studies were conducted as a planned experiment in the 3-ingredient mixes plan.