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      Rheology of Cement Pastes with Siliceous Fly Ash and the CSH Nano-Admixture

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      1 , * , 2
      Materials
      MDPI
      concrete, CSH nano-admixture, fly ash, concrete binding acceleration

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          Abstract

          The use of fly ash in cement composites adversely affects its mechanical properties during the first days of mixture curing. Modern technology, in the form of an admixture containing the hydrated calcium silicates, allows to accelerate the hardening and binding process of concrete. In this paper, studies on the influence of the admixture on properties of concretes with the ordinary Portland cements (OPC) containing the addition of siliceous fly ash (FA) have been carried out. As part of the experimental research, the authors conducted a series of studies for cement pastes modified with the addition of FA and the CSH nano-admixture (NA). In order to compare the mixtures, the following tests of cement pastes were carried out: the compressive and flexural strength, heat of hydration, SEM and rheological shrinkage. The mechanical parameters were tested after 4, 8, 12 and 24 h. The hydration heat test and microstructure analysis were carried out during the first 24 h of the concrete curing. All tests were carried out on the standard samples. On the basis of the heat of hydration test, much higher hydration heat was found in mixtures modified with the NA. During the shrinkage test, a positive effect of the NA was observed—the shrinkage during the first 28 days of mixture curing was lower than in the reference samples. The application of the CSH nano-admixture to cement pastes with the addition of FA has brought positive effects. Apart from a significant increase in strength in the first 24 h of mixture curing, a reduction in the rheological shrinkage was observed. The admixture can be successfully used in the ash concretes, in which a higher early strength is required.

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          Influence of Nucleation Seeding on the Hydration Mechanisms of Tricalcium Silicate and Cement

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            Properties of fresh and hardened fly ash/slag based geopolymer concrete: A review

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              Effect of Fly Ash and Silica Fume on Compressive and Fracture Behaviors of Concrete

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                29 June 2021
                July 2021
                : 14
                : 13
                : 3640
                Affiliations
                [1 ]Department of Conservation of Built Heritage, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40 Str., 20-618 Lublin, Poland
                [2 ]Department of Structural Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40 Str., 20-618 Lublin, Poland; g.golewski@ 123456pollub.pl
                Author notes
                [* ]Correspondence: b.szostak@ 123456pollub.pl ; Tel.: +48-815384412
                Author information
                https://orcid.org/0000-0002-2325-7103
                https://orcid.org/0000-0001-9325-666X
                Article
                materials-14-03640
                10.3390/ma14133640
                8269633
                34209995
                e63873a2-1b39-4c4b-964c-5bae9ef7cc3d
                © 2021 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 ( https://creativecommons.org/licenses/by/4.0/).

                History
                : 31 May 2021
                : 25 June 2021
                Categories
                Article

                concrete,csh nano-admixture,fly ash,concrete binding acceleration

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