Abstract
The main aim of this research was to investigate how the concentration of mineral aggregate influences the technological properties of concrete mixture such as: slump, flow characteristics and air content, as well as the density of concrete mixture. To sum up, 18 concrete mixture compositions were casted. First six compositions were casted in order to establish the dependence between the ratio of fine aggregate (sand fraction: 0/1 and 0/4) and the technological properties of fresh concrete mixture. Another six compositions were casted in order to investigate the link between course aggregate (gravel, fraction 4/16) concentration and the concrete mixture's technological properties. The last six mixtures were casted in order to test how the amount of fine particles (not exceeding 0.25 mm in diameter) influences the concrete mixture's technological properties. Santrauka Pagrindinis šio tyrimo tikslas – nustatyti, kaip mineralinių užpildų koncentracija veikia technologines betono mišinio savybes: slankumą, sklidumą, oro kiekį ir mišinio tankį. Iš viso buvo tirta 18 skirtingų betono mišinio sud≑čių. Pirmosios šešios sudėtys buvo analizuojamos siekiant nustatyti priklausomybę tarp smulkaus užpildo koncentracijos (smėlio frakcijos: 0/1 bei 0/4) ir technologinių betono mišinio savybių. Kitos šešios sudėtys buvo analizuojamos siekiant rasti priklausomybę tarp stambaus užpildo koncentracijos (žvirgždo frakcija 4/16) ir technologinių betono mišinio savybių. Paskutinės šešios betono mišinio sudėtys buvo analizuojamos siekiant nustatyti smulkiųjų dalelių, kurių skersmuo neviršija 0,25 mm, kiekio įtaką technologinėms betono mišinio savybėms.
Highlights
The easiest way to increase the workability of concrete mixture is to add extra water
The particles of limestone are much finer compared with the sand and the slump of concrete mixture decreased from 110 mm to 30 mm (50% of limestone filler)
The results showed that the plastic viscosity of concrete mixture increases using fine aggregate with bigger fraction
Summary
The easiest way to increase the workability of concrete mixture is to add extra water. There are a lot of incentives to improve the workability while keeping the w/c as low as possible or at least at a steady value. The workability of concrete mixture could be affected either by the shape and surface texture of the individual particles or the size distribution or grading of the aggregate particles. Researchers (Uğurlu, Topçu 2003) stressed out that the addition of 7–10% of mineral filler to fine aggregate (0–2 mm) improved the properties of concrete such as: compressive strength and flexural strength. Slump – is one of the most important technological properties of conventional concrete mixture. The relation between technological property (slump) and rheological property (yield stress) of concrete mixture was provided by Wallevik (2006) (Eq (1))
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
