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      The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

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          Abstract

          The paper examines the impact of aggregate shape on the compressive strength and thermal properties of concretes with silica fume based on two different aggregates: natural round gravel aggregate and crushed basalt aggregate. Compressive strength and thermal properties of individual concretes were determined during the first year of specimens curing. Additionally, porosity tests were conducted using mercury intrusion porosimetry and optical porosimetry. Mercury porosimetry tests showed that the use of silica fume led to a decrease in the content of pores of size smaller than 0.15 µm compared to the reference concretes without the addition of silica fume. However, tests carried out on crushed basalt-based concrete showed the presence of numerous additional pores with diameters ranging from 0.05 to 300 μm. In case of natural round gravel aggregate-based concrete, the addition of silica fume brought about an increase in its compressive strength. In turn, basalt-based concrete exhibited notably lower compressive strength values due to significantly higher porosity within the range of more than 70 μm. In basalt concrete, the obtained λ values are much lower than in concretes with normal gravel aggregate. In addition, the specific porosity structure had its impact on the process of drying of specimens of each group which occurred at a significantly faster rate in the basalt-based concrete. In conclusion, it can be stated that the use of crushed basalt aggregate causes a significant aeration of concrete, even despite the use of silica fume. As a result, the concrete based on crushed aggregate is characterized by a definitely lower compressive strength, but also better thermal insulation properties compared to analogous concrete made on natural round gravel aggregate.

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          Optimization of ultra-high-performance concrete by the use of a packing model

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            Predicting the compressive strength of silica fume concrete using hybrid artificial neural network with multi-objective grey wolves

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              Improvement in concrete behavior with fly ash, silica-fume and coconut fibres

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                19 June 2020
                June 2020
                : 13
                : 12
                : 2780
                Affiliations
                Department of Building Physics and Building Materials, Faculty of Civil Engineering and Architecture, West Pomeranian University of Technology Szczecin, al. Piastów 50, 70-311 Szczecin, Poland; Halina.Garbalinska@ 123456zut.edu.pl
                Author notes
                [* ]Correspondence: jstrzalkowski@ 123456zut.edu.pl ; Tel.: +48-91-449-43-41
                Author information
                https://orcid.org/0000-0001-7001-9303
                Article
                materials-13-02780
                10.3390/ma13122780
                7345081
                32575544
                6dc65434-2a8f-4804-935b-8a02cf3eaaae
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 08 May 2020
                : 17 June 2020
                Categories
                Article

                aggregate shape,silica fume,thermal properties,compressive strength,basalt aggregate,gravel natural aggregate,mercury porosimetry,optical porosimetry

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