Thermal conductivity and compressive strength of concrete incorporation with mineral admixtures

Civil Engineering Department, Engineering Faculty, Atatürk University, 25240 Erzurum, Turkey
Building and Environment 01/2007; DOI: 10.1016/j.buildenv.2006.06.010

ABSTRACT In this study, the effect of silica fume (SF), class C fly ash (FA), blast furnace slag (BFS), SF+FA, SF+BFS, and FA+BFS on the thermal conductivity (TC) and compressive strength of concrete were investigated. Density decreased with the replacement of mineral admixtures at all levels of replacements. The maximum TC of 1.233 W/mK was observed with the samples containing plain cement. It decreased with the increase of SF, FA, BFS, SF+FA, SF+BFS, and FA+BFS. The maximum reduction was, 23%, observed at 30% FA. Compressive strength decreased with 3-day curing period for all mineral admixtures and at all levels of replacements. However, with increasing of curing period reductions decreased and for 7.5% SF, 15% SF, 15% BFS, 7.5% SF+7.5% FA, 7.5% SF+7.5% BFS replacement levels compressive strength increased at 28 days, 7- and 28-days, 120 days, 28- and 120 days, 28 days curing periods, respectively. Maximum compressive strength was observed at 15% BFS replacement at curing period of 120 days.

1 Bookmark
  • Magazine of Concrete Research - MAG CONCR RES. 01/2009; 61(4):271-280.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this study, the influence of waste PET as lightweight aggregate (WPLA) replacement with conventional aggregate, on thermal conductivity, unit weight and compressive strength properties of concrete composite was investigated. For this purpose, five different mixtures were prepared (the control mixtures and four WPLA mixtures including 30%, 40%, 50%, and 60% waste PET aggregate by volume). Thermal conductivity (TC) coefficients of the specimens were measured with guarded hot plate apparatus according to TS ISO 8302 [1]. The thermal conductivity coefficient, unit weight and compressive strength of specimens decreased as the amount of WPLA increased in concrete. The minimum thermal conductivity value was 0.3924 W/m K, observed at 60% WPLA replacement. From this result, it was concluded that waste PET aggregates replacement with conventional aggregate in the mixture showed better insulation properties (i.e. lower thermal coefficient). Due to the low unit weight and thermal conductivity values of WPLA composites, there is a potential of using WPLA composites in construction applications.
    Composites Part B Engineering 02/2013; 45(1):721-726. · 2.14 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study is to suggest the material design method of lightweight mortar that reduces the mass of building components and provides them with better insulation. To achieve this, we applied a number of special lightweight aggregates and applied the packing density model, porous mortar, and a combination of both methods. A series of experiments were carried out in order to investigate the mechanical properties and examine the thermal conductivity of mortar. The study identified that the adopted material design methods were effective in reducing the density of mortar and in obtaining sufficient insulation. Furthermore, compressive strength sufficient for structural purposes was also achieved in certain types of mortar. Finally, by combining the packing density model and porous mortar, lightweight insulation blocks were developed for achieving not only sufficient bearing capacity but also high insulation performance.
    First International Conference on Concrete Sustainability, Tokyo; 05/2013