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The interactions between anti-foaming and superplasticizing admixtures and their consequence for properties of self-compacting mortar and concrete

Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The aim of this paper is to investigate the effects of anti-foaming admixture type (AFA) and time of its introduction on compatibility with two types of PCP-based superplasticizer, air content, rheological parameters, physical adhesion, mechanical strength, microstructure and air-voids size of self-compacting mortar and concrete (SCC). Results reveal that the air content of plastic self-compacting mortars mixture decreases with the implementation of AFA regardless of the time of its introduction. Antifoaming admixture causes the increase of the mortar’s flow diameter most when it is introduced together with PCP. The plastic viscosity value depends on the type of AFA significantly. AFA admixtures reduce the physical adhesion of self-compacting mortar. Moreover, test results prove that mortars with AFA maintain initial consistency for a longer time in comparison with mortar with SP only. Too big amount of AFA has a negative effect on mechanical properties and microstructure. Proper dosage of the right type of the anti-foaming admixture does not influence negatively compressive strength of mortar or concrete. The research results proved that too high dosage of AFA may cause compressive strength decrease and microcracking of self-compacting mor-tar or concrete, indicated on the basis of SEM research results.
Rocznik
Strony
61--71
Opis fizyczny
Bibliogr. 32 poz.
Twórcy
  • PhD; Silesian University of Technology, Department of Building Processes and Building Physics, Faculty of Civil Engineering, Akademicka 5, 44-100 Gliwice, Poland
Bibliografia
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  • [7] Kamal H, Khayat, Assaad J. (2002 July-August). AirVoid Stability in Self - Consolidating Concrete. ACI Materials Journal, 99(4), 408-416.
  • [8] Khayat K.H. (2000). Optimization and performance of the air-entrained, self-consolidating concrete, ACI Materials Journal, 97(5).
  • [9] Kobayashi M., Nakakuro E, Kodama K., Negami S. (1981). Frost resistance of superplasticized concrete, ACI SP-68, 269-282.
  • [10] Litvan, G.G. (1983). Air entrainment in the presence of superplasticizers. ACI Journal 80(33), 326-331.
  • [11] EN 934-2:2009+A1:2012 Admixtures for concrete, mortar and grout. Concrete admixtures. Definitions, requirements, conformity, marking and labelling
  • [12] Łaźniewska-Piekarczyk B. (2009). The effect of superplasticizers and anti-foaming agents on the airentrainment and properties of the mix of self-compacting concrete, Cement Wapno Beton, 3, 133-145.
  • [13] Szwabowski, J., Łaźniewska, B. (2009). Air-entrainment problem in self-compacting concrete, Journal of Civil Engineering and Management, International Research and Achievements, Vilnius: Technika, 15(2), 137-147.
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  • [17] Łaźniewska-Piekarczyk B. (2008). The surface tension of cement paste and its affects to formation air bubbles, 6th International Conference AMCM’2008 Analytical Models and Concepts in Concrete and Masonry Structures, Łódź, 229-230 (abstract with paper in CD).
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Uwagi
PL
Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-03cccf62-a826-4eb3-871c-3451e24f3dcd
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