Wpływ nanokrzemionki na czas wiązania, wytrzymałość wczesną i hydratację kompozytu kopolimer styren-butadien/cement

• Autorzy: Wang Ru , Xi Ziyan , Wang Gaoyong

Identyfikatory

DOI

10.32047/CWB.2021.26.3.3

Warianty tytułu

EN

Influence of nanosilica on the setting time, early strength and hydration of styrene-butadiene copolymer/cement composite cementitious material

• Języki publikacji: PL EN

Abstrakty

PL

Materiały z cementu modyfikowanego kopolimerem styren-butadien [KSB] są szeroko stosowane, ale dodatek KSB może opóźnić wiązanie i twardnienie cementu, co ogranicza jego zastosowanie w niektórych przypadkach. W niniejszej pracy wybrano nanokrzemionkę jako składnik modyfikujący w celu omówienia jej wpływu na wczesną hydratację, wiązanie i twardnienie kompozytowego materiału cementowego KSB/cement. Mierząc czas wiązania i wytrzymałość wczesną kompozytowego materiału cementowego KSB/cement modyfikowanego nanokrzemionką, przeanalizowano wpływ nanokrzemionki na proces wiązania i twardnienia kompozytowego materiału cementowego. Ciepło hydratacji kompozytowego materiału cementowego KSB/cement modyfikowanego nanokrzemionką wyznaczono metodą kalorymetrii izotermicznej. Produkty hydratacji zbadano metodą dyfrakcji rentgenowskiej, co pozwoliło na analizę wpływu nanokrzemionki na wczesny proces hydratacji kompozytowego materiału cementowego. Wyniki badań wykazują, że dodatek nanokrzemionki może przyspieszać proces wiązania i twardnienia kompozytowego materiału cementowego, a im większa jest jej dawka, tym efekt ten jest wyraźniejszy. Dodatek nanokrzemionki przyspiesza tworzenie się ettringitu i wodorotlenku wapnia poprzez wpływ na hydratację glinianu trójwapniowego i krzemianu trójwapniowego – skraca okres indukcji i czas trwania głównego efektu termicznego, to jest przyspiesza proces hydratacji, a tym samym skraca czas wiązania i zwiększa wytrzymałość wczesną.

EN

Styrene-butadiene copolymer [SB] modified cement-based materials are widely used, but the addition of SB can delay the setting and hardening of cement, which limits its application in some projects. In this paper, nanosilica was selected as the modifying component to study its influence on the early hydration, setting and hardening of SB/cement composite material. By measuring the setting time and early strength of nanosilica modified SB/cement composite material, the influence of nanosilica on the setting and hardening process of composite cementitious material was analyzed. The hydration heat of nanosilica modified SB/cement composite material was determined by isothermal calorimetry, and its hydration products were examined by X-ray diffraction, so as to analyze the influence of nanosilica on the early hydration process of composite cementitious material. The results show that the addition of nanosilica can effectively promote the setting and hardening process of composite cementitious material, and the higher the dosage is, the more significant the effect is. It also indicates that addition of nanosilica accelerates the formation of ettringite and calcium hydroxide, by promoting the hydration of tricalcium aluminate and tricalcium silicate. Shortens the hydration induction period and acceleration period of the composite cementitious material and accelerates the hydration process, thereby shortening the setting time and increasing the early strength.

Słowa kluczowe

PL

cement; kopolimer styren-butadien; nanokrzemionka; czas wiązania; wytrzymałość wczesna; hydratacja wczesna

EN

cement; styrene-butadiene copolymer; nanosilica; setting time; early strength; early hydration

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2021
• Tom: R. 26, nr 3
• Strony: 204--217
• Opis fizyczny: Bibliogr. 34 poz., il., tab.

Twórcy

autor

Wang Ru

• Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education; School of Materials Science and Engineering, Tongji University, Shanghai, PR China

autor

Xi Ziyan

• Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai, PR China

autor

Wang Gaoyong

• Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai, PR 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 (2021).