Self-Consolidating Green Concrete Based on Metakaolin and Aggregate Fines
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Self-Consolidating Green Concrete Based on Metakaolin and Aggregate Fines E.F. Kuznetsova1, G.M. Sobolev1, K. Sobolev2 1 Kostroma State Agricultural Academy, Kostroma, Russia 2 Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, Milwaukee, USA ABSTRACT The improvement of concrete workability can provide a considerable reduction of production expenses and also leads to significant improvement of construction quality. This paper reports on the development of self-consolidating concrete (SCC) based on local materials, such as metakaolin (MK) and aggregate fines. The use of metakaolin in SCC is found to be very promising, due to its ability to increase the flowability and segregation resistance of concrete mixtures. Furthermore, due to pozzolanic properties, the application of MK provides an improvement of concrete microstructure, strength and durability. The proposed SCC design includes the optimization of aggregates and combined aggregate-binder powders to target 0.45and 0.3- power particle size distributions, respectively. INTRODUCTION One of the promising directions to improve the performance of concrete is related to better material packing which is achieved by filling the cement matrix by highly dispersed mineral particles of different origin and granular composition. As a result, not only the strength and deformative characteristics of concrete can be improved, but using this approach also helps to extend the application range of raw materials, including industrial by-products [1]. Using multicomponent binders based on industrial by-products combined with chemical admixtures enables to adjust the characteristics of fresh and hardened concrete [2–8]. Nowadays, the application of selected industrial by-products such as silica fume, fly-ash, and blast furnace slag is a well established technology; however, the application of aggregate fines in concrete using local by-product deposits has a limited coverage in scientific literature [6]. The application of metakaolin (MK) is another attractive direction to improve concrete properties [2–5]. The addition of MK results in an increase of flowability of concrete mixture and prevents segregation of fresh concrete with high workability. The improvement of concrete structure is achieved due to the reaction of MK with Ca(OH)2 released during cement hydration and formation of secondary C–S–H phases [5]. Previous investigations demonstrated that concrete mixtures with metakaolin have similar characteristics to those with silica fume [2–5]. The reported research is focused on the development of superplasticized self-consolidating concrete (SCC) based on multicomponent binder with limestone microfiller and metakaolin. EXPERIMENTAL PROGRAM The standard method to estimate the interaction of components in the complex composite system "binder-mineral additive(s)-admixture-water-aggregates" is based on a complete factorial experiment. With seven or more components in the mixture, such experiment is time and effort
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