Rozwój wytrzymałości na ściskanie naparzanych zapraw cementowych z dużą ilością popiołów lotnych mielonych na mokro

• Autorzy: Tan Hongbo , Gu Xianyue , He Xingyang , Luo Zhongtao

Identyfikatory

DOI

10.32047/CWB.2020.25.3.5

Warianty tytułu

EN

Compressive strength development of steam cured cement paste with high volume wet-grinded coal fly ash

• Języki publikacji: PL EN

Abstrakty

PL

W badaniach przygotowano mieloną na mokro drobnoziarnistą zawiesinę popiołu lotnego. Wykonano spoiwa cementowo-popiołowe z 30%, 50% i 70% zawartością popiołu lotnego, o stosunku woda/spoiwo równym 0,5. Próbki najpierw naparzano w 60°C przez 20 godzin, następnie schładzano do temperatury pokojowej, w ciągu 4 godzin. W końcowym etapie próbki dojrzewały w warunkach normowych do 28 dnia hydratacji. Zbadano wytrzymałość na ściskanie po 1 i 28 dniach oraz proces hydratacji i strukturę porowatości, wykorzystując rentgenografię, analizę termiczną, skaningową mikroskopię elektronową, spektroskopię magnetycznego rezonansu jądrowego oraz porozymetrię rtęciową. Wyniki pokazały, że jednodniowa wytrzymałość na ściskanie próbek zawierających do 50% DZPL była większa w porównaniu do zaczynu wzorcowego, w którym spoiwem był tylko cement. Wynika to z dużej aktywności i powierzchni właściwej popiołu lotnego, co spowodowało zwartą mikrostrukturę po naparzaniu. Dalszy wzrost wytrzymałości próbek dojrzewających po naparzaniu przez 28 dni, był zaskakująco mały. Zwiększenie wytrzymałości wynosiło 18% w przypadku 30% dodatku popiołu, 10% dla 50% dodatku oraz 11% po zastąpieniu 70% cementu popiołem. Wzrost wytrzymałości zapraw z popiołem mielonym na mokro, po dłuższym okresie dojrzewania, był znacznie mniejszy niż w przypadku zastosowania popiołu lotnego, który nie został poddany żadnej obróbce. Jednym z powodów była bardziej zwarta mikrostruktura zaczynów z popiołem mielonym na mokro, co utrudniało proces hydratacji cementu. Kolejnym powodem była mniejsza zawartość wodorotlenku wapnia, który jest substratem w reakcji pucolanowej popiołu.

EN

In this study, super fine fly ash slurry [WGFA] was prepared by wet grinding from the coal fly ash. Cement-fly ash binder with 30%, 50%, and 70% dosage of fly ash was designed, with a water/binder ratio of 0.5. The samples were firstly cured for 20 hours under steam curing at 60°C and then cooled to room temperature within 4 hours, followed by further curing to 28 days of age under standard curing condition. The compressive strength at 1 day and 28 days were examined, and the results were discussed in terms of hydration process and pore structure, which were evaluated by XRD, TG, SEM, NMR, and MIP. The results showed that 1 day compressive strength of the system with up to 50% WGFA was higher than that of the cement system. The reason was due to the high reaction activity of WGFA under steam curing and the excellent filling effect of fine particles. However, further curing to 28 days, the strength increase was surprisingly unacceptable, with an increase by 18% at 30% dosage, by 10% at 50% dosage, and by 11% at 70% dosage. These increases were much less than that in raw fly ash system. One reason was due to the denser structure which hindered the transportation of ions and water molecules for further hydration; the other reason was because of very little calcium hydroxide in the system, to activate the pozzolanic reaction of fly ash.

Słowa kluczowe

PL

popiół lotny; popiół węglowy; mielenie na mokro; wytrzymałość; hydratacja; udział duży

EN

coal ash; fly ash; wet grinding; strength; hydration; high volume

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2020
• Tom: R. 25, nr 3
• Strony: 211--231
• Opis fizyczny: Bibliogr. 72 poz., il., tab.

Twórcy

autor

Tan Hongbo

• State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, P. R. China

autor

Gu Xianyue

• State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, P. R. China

autor

He Xingyang

• School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, P. R. China

autor

Luo Zhongtao

• School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, He Nan, P. R. China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).