ORALS

SESSION: Non-ferrousMonPM2-R7	6th Intl. Symp. on Sustainable Non-ferrous Smelting and Hydro/Electrochemical Processing
Mon Nov, 5 2018 / Room: Pontal (50/2nd)
Session Chairs: Shefik Imeri; Andrej Ivanič; Session Monitor: TBA

16:45: [Non-ferrousMonPM211] Invited
Freeze/Thaw Performance of Concrete with Addition of Fly Ash and Recycled Rubber
Andrej Ivanič¹ ; Sebastian Toplak¹ ; Samo Lubej¹ ; ¹University of Maribor, Maribor, Slovenia;
Paper Id: 236 [Abstract]

The concrete industry is one of the major consumers of natural resources. The main aim of sustainable development is to find alternative resources, which could decrease negative effects of the concrete industry on the environment and contribute to the preservation of natural resources. Huge amounts of waste tires accumulated all over the world are recognized as a good supplement for natural aggregates in concrete [1], while the fly ash is used as a replacement for Portland cement in concrete owing to its pozzolanic properties [2]. It is important to protect the environment, conserve the topsoil, and prevent dumping of fly ash from thermal power stations on land and to promote utilization of fly ash in the manufacture of building materials and construction activity. In this paper, an experimental investigation of the freeze/thaw performance on the concrete with recycled waste tire rubber and fly ash addition was conducted. As a partial substitute for the Portland cement, two types of fly ash were used and the specific part of mineral aggregate was replaced by recycled rubber particles. Half of the samples were subjected to freeze/thaw cycles in order to compare their mechanical properties with concrete samples not treated in the temperature chamber. All samples were also tested for compressive strength and modulus of elasticity. Test results indicated that there was a significant improvement of concrete resistance to freezing and thawing, which was also observed by other researchers [3]. However, the freezing and thawing did not affect the compressive strength and modulus of elasticity as much as these features were affected by the choice of fly ash.

References:
[1] D. Bjegović, A. Baričević, M. Serdar, Durability Properties of Concrete with Recycled Waste Tyres, International Conference on Durability of Building Materials and Components, Porto, Portugal, 2011.

[2] A. N. Scott, M. A. D. Thomas, Evaluation of Fly Ash From Co-Combustion of Coal and Petroleum Coke for Use in Concrete, ACI Materials Journal 104 (2007) 62-70.

[3] R.Siddique, T. R Naik, Properties of concrete containing scrap-tire rubber : an overview, Waste Management 24 (2004) 563-569.