Akademik Veri Yönetim Sistemi
ISWA World Congress, Vienna, Avusturya, 7 - 11 Ekim 2013
Self-compacting concrete (SCC) is considered as a concrete which can be placed and compacted under its self weight with little or no vibration without segregation or bleeding. It is used to facilitate and ensure proper filling and good structural performance of restricted areas and heavily reinforced structural members. It has gained significant importance in recent years because of the advantages it offers. SCC was developed in Japan. Researchers have found that the use of mineral admixtures such as fly ash and blast furnace slag could increase the workability of the concrete mix without increasing its cost, while reducing the dosage of superplasticizer needed to obtain similar slump flow compared to concrete made with Portland cement only. The waste marble dusts obtain by different methods or cutting process of marble in marble manufacturing companies. However, some environmental problems occur during the uncontrolled spill of these waste materials in habitat. During sawing, shaping, and polishing process, about 25% of the processed marble turns into dust or powder form. Turkey has 40% of the total marble deposits in the world such that 7,000,000 tons of marble have been produced in Turkey annually and 75% of it has been processed in nearly 5000 processing plants. The other waste used in this study is ground garnaulated balast furnace slag (GBFS) which is the by-product of iron industry. Slag is a mineral admixture that has a chemical composition very close to the one of cement and relatively constant. In the world, there is about 250 million tonnes of slag generated per year. Out of which only 90 million tones are used in the production of concrete.
The use of any of these mineral admixtures could increase the fluidity of the concrete and may reduce the requirement of superplasticizer necessary to obtain a similar slump flow compared with the same concrete containing cement only. In this study the physical and mechanical properties of steel fiber reinforced SCC produced with marble dust and blast furnace slag was investigated. Utilization of marble dust and GBFS as mineral filler material in SCC mixtures increased the cohesiveness of the fresh concrete. Due to the pozzolanic effect of GBFS the strength properties of hardened composite specimens were increased with improved flowability.