The effect of meta-halloysite on alkali–aggregate reaction in concrete
PBN-AR
Instytucja
Wydział Budownictwa i Architektury (Politechnika Świętokrzyska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Materials and Structures (35pkt w roku publikacji)
ISSN
1359-5997
EISSN
Wydawca
DOI
URL
Rok publikacji
2017
Numer zeszytu
5
Strony od-do
1-12
Numer tomu
50
Link do pełnego tekstu
Identyfikator DOI
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Autorzy
(liczba autorów: 1)
Słowa kluczowe
en
Alkali silica reaction
Meta-halloysite
Pozzolanic reactivity
Mortar expansion
Mitigation
Microstructure
Streszczenia
Język
en
Treść
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.
Cechy publikacji
peer-reviewed
Inne
System-identifier
64450
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