Effect of the mix composition with superplasticizer admixture on mechanical properties of high–strength concrete based on reactive powders
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Military University of Technology, Faculty of Civil Engineering and Geodesy, 2 gen. S. Kaliskiego Street, 00-908 Warsaw, Poland
Military University of Technology, Institute of Optoelectronics, 2 gen. S. Kaliskiego Street, 00-908 Warsaw, Poland
Institute of Aviation Łukasiewicz, Unmanned Technologies Center, 110/114 Krakowska Avenue, 02-256 Warsaw, Poland
Submission date: 2021-12-10
Final revision date: 2022-02-17
Acceptance date: 2022-03-01
Publication date: 2023-01-03
Archives of Civil Engineering 2022;68(4):77-95
This paper outlines effect of the mix composition on mechanical properties of high–strength concrete based on aggregate size like in of Reactive Powder Concrete (RPC) but without fiber reinforcement. The main purpose which guided the authors choosing proportion of water and superplasticizer (SP) was to achieve a similar consistency in the test slump for various concrete mix. Test results for 3 groups of superplasticizers, designated as D – with chemical base – acrylic polymer, V – with chemical base – polycarboxylate ether, P – with chemical base – modified polycarboxylates, two cement groups, designated as Cem A – with fineness Blaine 3980 cm 2/g, Cem B – with fineness Blaine 4430 cm 2/g and 2 types of aggregate: basalt and granite were presented. After curing for 1, 7 and 28 days samples were tested for compressive strength and flexural tensile strength. The article also presents the study of the elemental composition and structure of the SP with the use of the SEM electron microscope. The amount of solid particles in the SP was also determined by the water vaporization. The assumption of the paper was to maintain the consistency of the mixture at the S2 level according to the Eurocode standard. The paper proposes a method based on SEM analysis in order to select a superplasticizer with the best ductility parameters, and the best results of the compressive and flexural tensile strength of concrete samples were obtained. The best results for compressive strength after 28 days are obtained for concrete series with the polycarboxylate ether superplasticizer and modified polycarboxylate ether superplasticizer in combination with the use of type A cement and it is greater than for the concrete series with type B cement by 11.7%.
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