© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/). E3S Web of Conferences 49, 00079 (2018) https://doi.org/10.1051/e3sconf/20184900079 SOLINA 2018 The impact of coarse aggregate shape on the behavior of self-compacting high-performance concrete Krzysztof Ostrowski 1,* 1 Faculty of Mining and Geoengineering, AGH University of Science and Technology, Cracow, Poland Abstract. Self-Compacting High Performance Concrete (SCHPC) presents a crucial step in the development of concrete technology. The most important features of self-consolidating concrete are flowability, segregation resistance and passing ability. Generally, the rheological properties are modified by effective superplasticisers and water to binder ratio. The aim of this study is to focus on the important aspect of the impact of shape of the coarse aggregate on fresh concrete mixture properties, strength and deformability of SCHPC. Coarse aggregate is a significant proportion of the concrete volume and therefore has a meaningful influence on its quality. By appropriate selection of the shape of the grain aggregate, it is possible to affect the rheological parameters of concrete. The results presented in this study indicated that the shape of the grains of coarse aggregate has an impact on the strength and stiffness of SCHPC. Moreover, the occurrence of irregular grains of coarse aggregate causes lower slump flow and higher plastic viscosity in comparison to concrete mixtures with regular grains only. The research presented in this article is part of the author's wider research devoted to this issue. 1 Introduction In recent years, an increase of the interest in the use of self-compacting concrete (SCC) in civil engineering is has been noticed. This technology is still developing and being considered for a wider range of applications and properties of concrete [1]. The ability to consolidate under its own weight of concrete mixture without any means of compaction is a characteristic of SCC. Due to using small size aggregate and flowability of concrete mixture, SCC spreads fluently around reinforcement [2–5]. It is worth noting that nowadays cement paste content and water to binder ratio are the most significant parameters of the mix design which influences rheological parameters and strength of concrete. Nevertheless mixed design methods are still being developed [6–8]. The quality of the aggregate is determined by grain composition and grain shape, which significantly affects its strength. The content of irregular grains in mineral aggregates depends mainly on the method of crushing the raw material, i.e. on the type of grinding equipment used, their construction and operating parameters, the degree of fragmentation and the number of crushing stages [9]. Bearing this in mind, the purpose of this study was to appraise the effect of coarse aggregate shape on the properties of SCHPC. * Corresponding author: [email protected]
The impact of coarse aggregate shape on the behavior of self-compacting high-performance concrete
Apr 22, 2023
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