Abstract
The aim of this study is to compare the properties of three self-compacted concrete (SCC) mixes, with normal concrete mix. For the SCC mixes, the cement was replaced partially with either limestone dust or clinker waste dust. Compressive strength, tensile splitting, and flexural strength tests were conducted at ages of 3, 7, 14, 28, and 56 days to trace the strength development. Modulus of elasticity tests were conducted at 28-days. The test results showed that mixes containing lime-stone dust have better fresh properties than the other SCC mix. The compressive strength test results showed that the mix containing clinker waste powder give higher compressive strength. and mix containing eight percent limestone give higher tensile splitting strength and flexural strength than the mix has ten percent of limestone give for all curing regimes. The results showed that the modulus of elasticity is relatively lower than that for normal concrete and the voids volume in normal concrete is greater than that of SCC. Keywords: Clinker dust, Compressive strength, Concrete, Fresh properties, Lime-stone
Highlights
Self-Compacting concrete (SCC) was first developed in Japan more than 20 years ago and it was widely applied in architectural and structural building elements due to its ability to spread and passing through congested reinforcement without compaction
Properties of Fresh SCC The Slump flow test is used to measure the ability of spreading by filling the standard slump cone (D1=100mm, D2=200mm and H=300mm) with SCC, Fig. (1), and left one minute and the cone is lift vertically and the time elapsed since the base of cone was lifted from the plate (900×900) mm till the concrete reached (500) mm diameter was recorded, two perpendicular diameters were measured as the concrete stopped spreading
The three SCC mixes contain more paste and less aggregate than the conventional concrete mixes, and this contributes to the improved workability
Summary
Self-Compacting concrete (SCC) was first developed in Japan more than 20 years ago and it was widely applied in architectural and structural building elements due to its ability to spread and passing through congested reinforcement without compaction. In 2005 Collepardi [3] used limestone dust in one mix and fly ash in another mix with the same cement content, and he found that both materials enhanced the compressive strength. In 2007 Felekoglu et al [5] made five mixes with different percent of super plasticizers, and different water quantities ranging between (140-227) litre/ m3 to get a proper method of mix design for SCC. They concluded that a proper fresh SCC property can be obtained if the mixing time does not exceed 30 minutes and the casting is not later than 30 minutes after mixing. The chemical analysis for the lime stone dust and the clinker waste dust are shown in Table (1)
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