Mineral Composition of Heavy Aggregates for Nuclear Shielding Concrete in Relation to Alkali-silica Reaction

Jóźwiak–Niedźwiedzka, Daria; Gibas, Karolina; Brandt, Andrzej M.; Glinicki, Michał A.; Dąbrowski, Mariusz; Denis, Piotr

doi:10.1016/j.proeng.2015.06.132

Cited by 19 publications

(16 citation statements)

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“…Expansion produced by alkali-silica reaction has been also observed in Ikata nuclear power station (NPP) in Japan, in Gentilly in Canada, and in Saint-Laurent in Saint-Laurent, France. The concrete degradation due to ASR on the external face of the containment building of Tihange 2 in Belgium has been observed also (Jóźwiak-Niedźwiedzka et al, 2015). These examples demonstrate that the issue of ASR was not considered seriously during the material selection for NPP structures.…”

Section: Introductionmentioning

confidence: 89%

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Potential for Alkali–Silica Reaction in Radiation Shielding Concrete Containing Special Aggregates

Jóźwiak–Niedźwiedzka¹,

Glinicki²,

Gibas³

2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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In the present study, the potential for the alkali-silica reaction (ASR) in radiation shielding concrete containing special aggregates is presented. The tests were performed on two kinds of aggregate: (1) high-density aggregate to absorb the gamma radiation (barite, magnetite, and hematite) and (2) mineral with high bound water content to attenuate the neutron flux (serpentinite). The optical microscopy in transparent light on thin sections, XRD and XRF method, was used to assess the mineral composition of aggregates. ASTM C1260 test method for potential alkali reactivity of aggregates was applied also to investigate the effect of different content and crystal size of silica on the expansion due to ASR.The tests revealed that all tested aggregates, such as barite, magnetite, hematite, and serpentinite, were characterized by low solubility at high pH. The XRD and XRF results have shown presence of silica in all tested aggregates, but the microscopic observations enhanced size and composition of SiO 2 crystals. The aggregates were not deleterious themselves, but the different content and size of SiO 2 crystals in the aggregate influenced their potential for alkali-silica reaction. The quartz in heavy kinds of rocks and in the serpentinite used for radiation shielding was just as much potentially susceptible to deleterious ASR as quartz in common rocks used in concrete technology. In the hematite, silica crystals were classified as microcrystalline, so it should be considered as potentially reactive. The expansion tests confirmed that hematite was highly reactive. Other aggregates after 14 days of testing did not exceed 0.1% elongation limit. The microstructural analysis of thin sections prepared from mortars after ASTM C1260 test confirmed expansion of aggregate grains due to ASR.

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Section: Introductionmentioning

confidence: 89%

“…Damage can be caused by as little as 0.5% of defective aggregate. So, it is important to prove that special aggregate which is used for concrete in nuclear power structures is not prone to ASR, without any type of radiation (Jóźwiak-Niedźwiedzka et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Potential for Alkali–Silica Reaction in Radiation Shielding Concrete Containing Special Aggregates

Jóźwiak–Niedźwiedzka¹,

Glinicki²,

Gibas³

2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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Section: Materiały I Próbkiunclassified

“…Szczegółowy chemiczny skład kruszyw jest przedstawiony w publikacjach, [3,11]. Kruszywa ciężkie charakteryzowały się następującymi gęstościami: barytowe 4,2 g/cm 3 , magnetytowe 4,8 g/cm 3 , oraz hematytowe 5,1 g/cm 3 . Gęstość kruszywa serpentynitowego wynosiła 2,7 g/cm 3 , ale co waż-ne ze względu na absorpcję strumienia neutronów, zawartość chemicznej zwią-zanej wody wynosiła 12% oznaczona wg DTA.…”

Section: Materiały I Próbkiunclassified

“…Kruszywa ciężkie charakteryzowały się następującymi gęstościami: barytowe 4,2 g/cm 3 , magnetytowe 4,8 g/cm 3 , oraz hematytowe 5,1 g/cm 3 . Gęstość kruszywa serpentynitowego wynosiła 2,7 g/cm 3 , ale co waż-ne ze względu na absorpcję strumienia neutronów, zawartość chemicznej zwią-zanej wody wynosiła 12% oznaczona wg DTA. Wszystkie kruszywa były zbadane za pomocą metody XRD w celu określenia składu mineralogicznego.…”

Section: Materiały I Próbkiunclassified

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