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[64450] Artykuł:

The effect of meta-halloysite on alkali–aggregate reaction in concrete

Czasopismo: Materials and Structures   Tom: 50, Zeszyt: 5, Strony: 1-12
ISSN:  1359-5997
Wydawca:  SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Opublikowano: Pażdziernik 2017
 
  Autorzy / Redaktorzy / Twórcy
Imię i nazwisko Wydział Katedra Do oświadczenia
nr 3		 Grupa
przynależności		 Dyscyplina
naukowa		 Procent
udziału		 Liczba
punktów
do oceny pracownika		 Liczba
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kryteriów ewaluacji
Justyna Zapała-Sławeta orcid logo WBiAKatedra Technologii i Organizacji Budownictwa *****Takzaliczony do "N"Inżynieria lądowa, geodezja i transport10035.00.00  

Grupa MNiSW:  Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A)
Punkty MNiSW: 35
Klasyfikacja Web of Science: Article

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Keywords:

Alkali silica reaction  Meta-halloysite  Pozzolanic reactivity  Mortar expansion  Mitigation  Microstructure 


Abstract:

Damage to concrete structuresmay occur as a result of internal effects. Alkali silica reaction (ASR) is a long term reaction between alkalis and reactive aggregate present in the concrete. The reaction product is sodium-potasium-calcium silica gel, able to absorb water, resulting in the expansion and cracking of concrete. The key problem is to find the right method for mitigating the internal damage. This paper presents the results of an investigation into the effectiveness of calcined halloysite (meta-halloysite) in improving the resistance to alkali-silica reaction (ASR). The pozzolanic reactivity of meta-halloysite was also evaluated using Thermo-Gravimetric Analysis. Microstructures of mortar bars were observed by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (EDS) to investigate the location and chemical composition of ASR gel. The results from this study showed satisfactory level of pozzolanic reactivity when cement was partially replaced by meta-halloysite. It was demonstrated that a 20% addition of meta-halloysite are able to mitigate ASR and lower expansion of mortar bars with reactive aggregate to a safe level of not more than 0.1% at 14 days. Microstructural observations of the specimens containing meta-halloysite indicated the presence of a calcium-alkali-silicate-hydrate gel. But fewer reaction products and with different composition than those forming in the pastes without mineral additives are present.


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