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2015, vol. 58, iss. 4, pp. 3-20
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Properties of self-compacting concrete made of recycled aggregates and various mineral additives
Svojstva samougrađujućeg betona spravljenog s recikliranim agregatom i različitim mineralnim dodacima
Project: Utilization of by-products and recycled waste materials in concrete composites in the scope of sustainable construction development in Serbia: investigation and environmental assessment of possible applications (MESTD - 36017)
Abstract
By its technology, Self-Compacting Concrete does not need compaction by vibration. Compaction of this concrete, in every part, or in every corner of the formwork, including its hardly available parts, is done without any external forces except its own weight. These properties are achieved by adding superplasticizers, commonly with new Viscosity Modification Admixtures, or/and determined amount of powders. It is possible to use different mineral additions, where the use of those which are industrial by - products (like fly ash) has multiple environmental benefits. Lack of natural aggregate in urban areas and increasing distance between deposits of high - quality natural aggregate and building sites, forced building contractors to analyze possibility of replacing of natural aggregate with recycled materials (masonry, slag, concrete, etc.). On the other hand, huge amount of old concrete exists in urban areas and its removal and deposition is a big ecological problem. Aim of this paper is analysis of properties and technology of Self-Compacting Concrete with different mineral additions (lime, fly ash and silica fume), natural and recycled aggregate, considering mixes without recycled aggregate, with third recycled fraction, and with second and third recycled fractions.
Sažetak
Po svojoj tehnologiji, samougrađujući beton nakon unošenja u oplatu ne zahteva vibriranje. Ugrađivanje ovog betona u svakom delu, ili u svakom uglu oplate, uključujući i njene teško pristupne delove, ostvaruje se bez ikakvih spoljnih sila, osim sile gravitacije, tj. njegove sopstvene težine. Ovakva svojstva postižu se dodavanjem betonu hemijskih dodataka superplastifikatora, najčešće u kombinaciji s novom vrstom aditiva za modifikaciju viskoziteta i/ili primenom određene količine finog mineralnog dodatka - praha. Moguće je koristiti različite mineralne dodatke, pri čemu upotreba onih koji predstavljaju industrijski nusprodukt (poput letećeg pepela) ima višestruke ekološke koristi. Nedostatak prirodnog agregata u urbanim sredinama i sve veće rastojanje između nalazišta kvalitetnog prirodnog agregata i gradilišta, prisilili su graditelje da razmotre mogućnosti zamene prirodnog agregata recikliranim materijalima (građevinska keramika, zgura, beton i tako dalje). S druge strane, u urbanim sredinama često se javlja velika količina betonskog otpada čije uklanjanje i deponovanje predstavlja ekološki problem. Predmet ovog rada je analiza svojstava i tehnologije samougrađujućeg betona s različitim mineralnim dodacima (mlevenim krečnjakom, letećim pepelom i silikatnom prašinom), prirodnim i recikliranim agregatom, pri čemu su pravljene mešavine bez recikliranog agregata, s trećom recikliranom frakcijom i s drugom i trećom recikliranom frakcijom.
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