Influence of superabsorbent polymers on properties of fiber reinforced mortars containing fly ashes

• Autorzy: Rostami Rohollah , Klemm Agnieszka J

Identyfikatory

DOI

10.7409/rabdim.020.010

Warianty tytułu

PL

Wpływ superabsorbentów na właściwości zbrojonych włóknami zapraw zawierających popioły lotne

• Języki publikacji: EN PL

Abstrakty

EN

High susceptibility to early cracking induced by self-desiccation processes is a major problem in concrete slabs and bridge decks segments, which are often subjected to a rapid evaporation of water. Internal curing provided by superabsorbent polymers (SAPs) can address the problem by facilitating hydration process and controlling water supply in both fresh and hardened states. The paper discusses the influence of three SAPs on fresh and hardened properties of fibre reinforced mortars containing fly ash (FRM-FA). The analysis confirmed that SAP with smaller particle sizes (< 80 µm) has a dominant influence on mitigation of autogenous shrinkage and facilitates formation of denser and more durable cementitious matrix. Despite initial strength reduction caused by collapsing SAP, mechanical characteristics of mortars are significantly improved by the prolonged hydration, facilitated by SAP and refilling of SAP pores. The effect is much more pronounced for finer polymers (< 80 µm).

PL

Wysoka podatność na przedwczesne spękania wywołane samoosuszaniem stanowi istotny problem w przypadku płyt betonowych i betonowych segmentów pomostów, gdzie często zachodzi bardzo szybkie parowanie wody. Wewnętrza pielęgnacja zapewniona przez superabsorbenty (SAP) może rozwiązać ten problem, wspomagając przebieg procesu hydratacji i zapewniając kontrolę nad dostępnością wody, zarówno w mieszance jak i stwardniałym betonie. W artykule omówiono wpływ trzech rodzajów SAP na właściwości mieszanek i stwardniałych zbrojonych włóknami zapraw zawierających popioły lotne (FRM-FA). Analiza potwierdziła, że SAP o mniejszych wymiarach cząstek (< 80 µm) ma dominujący wpływ na złagodzenie skurczu autogenicznego i ułatwia formowanie gęstszej i trwalszej matrycy cementowej. Pomimo początkowego spadku wytrzymałości spowodowanej zapadaniem się SAP, właściwości mechaniczne zapraw ulegają znacznej poprawie dzięki przedłużeniu hydratacji zapewnionemu przez działanie SAP oraz ponowne wypełnienie porów pozostałych po SAP. Wpływ ten jest znacznie wyraźniejszy w przypadku drob- niejszych polimerów (< 80 µm).

Słowa kluczowe

EN

fly ash (FA); polymeric fibres (PF); superabsorbent polymers (SAPs); sustainability

PL

popiół lotny (FA); superchłonne polimery (SAP); włókna polimerowe (PF); rozwój zrównoważony

• Wydawca: Instytut Badawczy Dróg i Mostów
• Czasopismo: Roads and Bridges - Drogi i Mosty
• Rocznik: 2020
• Tom: Vol. 19, no. 2
• Strony: 149--163
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Rostami Rohollah

• Glasgow Caledonian University, School of Computing, Engineering and Built Environment, 70 Cowcaddens Road, Glasgow G4 0BA, UK

autor

Klemm Agnieszka J

• Glasgow Caledonian University, School of Computing, Engineering and Built Environment, 70 Cowcaddens Road, Glasgow G4 0BA, UK

Bibliografia

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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).