Author(s):
1. Aleksandar Savić, Građevinski fakultet, Beograd, Serbia
2. Gordana Broćeta, Univerzitet u Banjoj Luci, Arhitektonsko-građevinsko-geodetski fakultet, Republic of Srpska, Bosnia and Herzegovina
3. Marina Aškrabić, Građevinski fakultet, Beograd, Serbia
4. Sonja Panić, Građevinski fakultet, Beograd, Serbia
5. Ljubomir Vidanović, Građevinski fakultet, Beograd, Serbia

Abstract:
The subject of the tests presented in the paper is the influence of the mixing method on the physical-mechanical properties of fine-grained concrete with the nominally largest aggregate grain of 8 mm. Concretes with three different aggregate compositions (river, crushed and mixture with coarse recycled aggregate) were mixed by the usual, and then by two-stage mixing approach (TSMA). Slump and flow, density and temperature were tested for fresh concrete. The compressive strength, flexural, splitting tensile strength, density, ultrasonic pulse velocity and water absorption were recorded on hardened concrete. Concretes prepared using recycled aggregate can, according to all the mentioned tests, be used as an adequate replacement for concretes prepared using river or crushed aggregate, while the two-phase approach had the greatest effect on increase of the flexural strength.

Key words:
recycled aggregate,concrete,two-phase mixing approach,properties of concrete

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
28.08.2020.

Conference:
Contemporary Materials 2020 - Savremeni materijali