Influence of Blended Cements with Calcareous Fly Ash on Chloride Ion Migration and Carbonation Resistance of Concrete for Durable Structures

Glinicki, Michał A.; Jóźwiak–Niedźwiedzka, Daria; Gibas, Karolina; Dąbrowski, Mariusz

doi:10.3390/ma9010018

Cited by 52 publications

(46 citation statements)

References 21 publications

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“…Among the several ways to lessen these emissions, the use of additions as cement replacement has become very popular in recent years [1,2,3,4,5]. In general, many of these additions are wastes coming from other industries, so their reuse also has an added benefit.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

et al. 2017

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Nowadays, one of the most popular ways to get a more sustainable cement industry is using additions as cement replacement. However, there are many civil engineering applications in which the use of sustainable cements is not extended yet, such as special foundations, and particularly micropiles, even though the standards do not restrict the cement type to use. These elements are frequently exposed to the sulphates present in soils. The purpose of this research is to study the effects in the very long-term (until 600 days) of sulphate attack in the microstructure of micropiles grouts, prepared with ordinary Portland cement, fly ash and slag commercial cements, continuing a previous work, in which these effects were studied in the short-term. The microstructure changes have been analysed with the non-destructive impedance spectroscopy technique, mercury intrusion porosimetry and the “Wenner” resistivity test. The mass variation and the compressive strength have also been studied. The impedance spectroscopy has been the most sensitive technique for following the sulphate attack process. Considering the results obtained, micropiles grouts with slag and fly ash, exposed to an aggressive medium with high content of sulphates, have shown good behaviour in the very long-term (600 days) compared to grouts made with OPC.

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Section: Introductionmentioning

confidence: 99%

Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

et al. 2017

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“…Among the different ways to reach this aim, the use of additions as clinker replacement has lastly become increasingly common [1][2][3][4][5][6], providing benefits such as the lessening of CO 2 emissions and the reduction of energy consumption throughout the cement manufacture, as well as the reuse of wastes coming from other industrial sectors, which would also help to solve their storage problem.…”

Section: Introductionmentioning

confidence: 99%

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

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Nowadays, getting a more environmentally sustainable cement production is one of the main goals of the cement industry. In this regard, the use of active additions, like fly ash and ground granulated blast-furnace slag, has become very popular. The behaviour, in the short-term, of cement-based materials with those additions is well-known when their hardening is produced under optimum conditions. However, real structures are exposed to different environments during long periods, which could affect the development of microstructures and the service properties of cementitious materials. The objective of this work is to analyse the effects in the long-term (up to 5 years approximately) produced by the exposure to different non-optimum laboratory conditions in the microstructure, mechanical and durability properties of mortars made with slag and fly ash commercial cements. Their performance was compared to that observed for ordinary Portland cement (OPC) mortars. The microstructure has been analysed using mercury intrusion porosimetry. The effective porosity, the capillary suction coefficient, the chloride migration coefficient and mechanical strengths were analysed too. According to the results, mortars prepared using slag and fly ash sustainable commercial cements, exposed to non-optimum conditions, show a good performance after 5-years hardening period, similar or even better than OPC mortars.

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“…Każdorazowo badaniu poddano trzy próbki betonu o śred-nicy 100 mm i wysokości 50±3 mm. Pełen opis metody podano w [6]. Przyjęto kryteria oceny odporności na wnikanie jonów chlorkowych zaproponowane przez L. Tanga w [7]: kategoria "bardzo dobra", gdy D nssm < 2 x 10 -12 m 2 /s, "dobra", gdy D nssm = 2-8 x 10 -12 m 2 /s, "dopuszczalna", gdy D nssm = 8-16 x 10 -12 m 2 /s i "niedopuszczalna", gdy D nssm > 16 x 10 -12 m 2 /s.…”

Section: Metody Badańunclassified

Wpływ Kruszyw Specjalnych Na Porowatość I Przepuszczalność Betonów Osłonowych

et al. 2016

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Przedstawiono wyniki badań podciągania kapilarnego (PK), porowatości dostępnej dla wody (E) oraz współczynnika migracji jonów chlorkowych w stanie nieustalonym (D nssm ). Zakres badań obejmował betony z kruszywem magnetytowym, barytowym, serpentynitowym oraz kruszywem referencyjnym w postaci grysu amfibolitowego, które wcześniej poddane zostały selektywnemu kruszeniu i przesiewaniu, tak by zapewnić jednakowe krzywe uziarnienia/stosy okruchowe. Przeanalizowano wpływ mikrostruktury porów wyznaczonej za pomocą porozymetrii rtę-ciowej z odpornością na wnikanie jonów i cieczy w matrycę cementową. Z badań wynika, że betony z kruszywami specjalnymi osiągają wskaźniki przepuszczalności porównywalne lub nieco gorsze niż próbki referencyjne. Nie zaobserwowano systematycznego wpływu porowatości kapilarnej na wyniki badań przepuszczalności.Słowa kluczowe: podciąganie kapilarne, migracja jonów chlorkowych, kruszywo magnetytowe, kruszywo barytowe, kruszywo serpentynitowe, porowatość WprowadzenieStosowanie kruszyw specjalnych w betonach osłonowych ma szczególne znaczenie z uwagi na występujące w nich pierwiastki chemiczne osłabiające działanie promieniowania jonizującego. Kruszywa ciężkie w postaci rud magnetytu, barytu, hematytu, zawierające związki chemiczne z pierwiastkami o dużej masie atomowej, wykazują zdolność osłabiania promieniowania γ.

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Influence of Blended Cements with Calcareous Fly Ash on Chloride Ion Migration and Carbonation Resistance of Concrete for Durable Structures

Cited by 52 publications

References 21 publications

Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

Wpływ Kruszyw Specjalnych Na Porowatość I Przepuszczalność Betonów Osłonowych

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