Temat: reakcja alkalia-kruszywo - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Diagnosis of concrete structures distress due to alkali-aggregate reaction
Autorzy:: Owsiak, Z.
Zapała-Sławeta, J.
Czapik, P.
Powiązania:: https://bibliotekanauki.pl/articles/201887.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: alkali-aggregate reaction
diagnosis
concrete structure
reakcja alkalia-kruszywo
rozpoznanie
struktura betonu
Opis:: Damage and defects observed in concrete elements, such as a network of microcracks, popouts and eflorrescence can be caused by a variety of deleterious processes. The causes can include mechanical (overloading), physical (freeze-thaw cycle) or chemical exposure (sulphate corrosion, alkali-aggregate reaction). This paper analyses distress due to alkali-silica reaction, detected in selected concrete structures. The analysed concrete elements exhibited cracking, exudations and surface popouts. Identification of the presence of hydrated sodium-potassiumcalcium silicate gel can be considered the primary symptom suggestive of an alkali-silica reaction attack. Other damage-causing mechanisms can occur simultaneously.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 23-29
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Assessment gravel aggregate reactivity with alkalis in relation to methods of test
Autorzy:: Owsiak, Z.
Czapik, P.
Zapała-Sławeta, J.
Powiązania:: https://bibliotekanauki.pl/articles/230521.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: reakcja alkalia-krzemionka
kruszywo
petrografia
zaprawa
alkali-silica reaction
aggregate
petrography
mortar
Opis:: Alkali-aggregate reactivity (AAR) is one of the major causes of damage in concrete. Potential susceptibility of aggregates to this reaction can be determined using several methods. This study compares gravel alkali reactivity results obtained from different tests conducted on coarse aggregates with complex petrography. The potential for the reactivity in the aggregates was revealed in the chemical test using treatment with sodium hydroxide. Optical microscopy, scanning electron microscopy and X-ray diffraction were used to identify the reactive constituents. The expansion measured in the mortar bars test confirmed that the aggregate was potentially capable of alkali silica reactivity with consequent deleterious effect on concrete.
Źródło:: Archives of Civil Engineering; 2014, 60, 4; 441-451
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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