Alkali-silica reactions in granite-based aggregates: The role of biotite and pyrite

Venyite, Paul; Nemaleu, Juvenal Giogetti Deutou; Kaze, Cyriaque Rodrigue; Tchamba, Arlin Bruno; Kamseu, Elie; Melo, Uphie Chinje; Leonelli, Cristina

doi:10.1016/j.conbuildmat.2021.126259

Cited by 13 publications

(5 citation statements)

References 56 publications

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“…Alkali Silica Reaction, also known as Concrete cancer [13], is a regressive chemical reaction occurring within Concrete. The Reaction occurs between the reactive Silica (found in specific aggregates with disturbed structure) with the Alkalis present in Cement.…”

Section: Alkali Silica Reaction-a Brief Chemistrymentioning

confidence: 99%

Determination of Alkali Silica Reactivity (Asr) Potential of Aggregates in Khairpur Region

2022

IRJMETS

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Concrete's durability is affected by a range of factors. Alkali Silica Reaction (ASR) is one of such mechanisms that adversely impacts Concrete's durability and reduces its service life. The Reaction of reactive Silica (present in specific aggregates) and alkalis (present in Cement) begets ASR. The disturbed internal structure of Aggregate has a strong penchant for reactivity. In the presence of moisture, the Reaction produces a hygroscopic gel around the aggregate surface, which absorbs more moisture. As a result, the gel volume increases. The process engenders microcracking in Concrete. It propagates to the surface and takes the shape of 'map cracking'. This research work focuses on assessing the reactivity potential of Coarse Aggregates taken from two quarry sites of Kot Banglo, Khairpur region. The aggregates are washed and crushed. They are tested with Ordinary Portland Cement (OPC). ASTM 1260 test procedure was employed to check the reactivity potential of aggregates. The 14-day expansion of mortar bars (specimen dimension 25mm x 25mm x 285mm) was less than 0.1%. According to ASTM 1260, the result validates the innocuous characteristic of aggregates.

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Section: Alkali Silica Reaction-a Brief Chemistrymentioning

confidence: 99%

Determination of Alkali Silica Reactivity (Asr) Potential of Aggregates in Khairpur Region

2022

IRJMETS

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“…But for some wasted rock slag, they can't be used as concrete aggregate directly, because of AAR, which is known as "Concrete Cancer" [4]. AAR mainly includes alkali-carbonate reaction (ACR) and alkali-silica reaction (ASR) [5][6][7]. There are large number research for the ASR [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Research on alkali-carbonate reaction (ACR) and damage of freeze-thaw for pure dolomite as concrete coarse aggregate

Chen,

Xiong,

Wang

et al. 2024

Preprint

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Alkali-carbonate reaction (ACR) is one of the important components of alkali aggregate reaction (AAR) in concrete structures, which may lead to a serious damage for the concrete construction and effect on the durability of concrete projects adversely. Previous research has systematically investigated the possibility of ACR in dolomitic limestone. However, there is limited literature available for ACR in pure dolomite aggregate specifically. Therefore, this paper aims to investigates whether pure dolomite occur ACR and the freeze-thaw resistance of pure dolomite coarse aggregate concrete (PDCAC) due to the raw materials produced in the southwest of China, which is cold in winter. To determine the alkali activity of pure dolomite, three methods were employed: lithofacies method (LM), rock-cylinder method (RCM), and rapid preliminary screening test for carbonate aggregates (AAR-5). Lithofacies method confirmed that the dolomite used in this paper was pure almost, and no SiO2 content, ruling out the possibility of alkali-silica reaction (ASR). The rock-cylinder method indicated a reduction in length during the 84-day test period, which indicates the absence of ACR. Subsequently, the AAR-5 method was used to test ACR, and the samples exhibited a length expansion rate of far less than 0.1% within 28 days, which further confirmed the absence of alkali activity in pure dolomite. Finally, the freeze-thaw cycles test was carried out on the concrete with pure dolomite as concrete coarse aggregate. The results revealed no significant spalling on the concrete surface after 200 freeze-thaw cycles, and pure dolomite coarse aggregate concrete can withstand freeze-thaw damage to a certain extent.

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“…However, some types of waste rock slag cannot be used as concrete aggregate directly because of AAR, which is known as "concrete cancer" [6][7][8][9]. AAR mainly includes the alkali-carbonate reaction (ACR) and alkali-silica reaction (ASR) [10][11][12]. There is a large amount of research on the ASR [13][14][15][16], while little research exists on the ACR.…”

Section: Introductionmentioning

confidence: 99%

The Risk of Alkali–Carbonate Reaction and the Freeze–Thaw Resistance of Waste Dolomite Slag-Based Concrete

Chen,

Xiong,

Wang

et al. 2024

Buildings

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The alkali–carbonate reaction (ACR) is a type of alkali–aggregate reaction (AAR) that may lead to serious damage in concrete construction. There is sufficient research on the effect of the ACR on dolomite limestone; however, research on the effect of the ACR on pure dolomite is absent, and there are a large number of dolomite resources that cannot be effectively utilized in civil engineering. This study aims to investigate whether the ACR occurs in pure dolomite spoil and to determine the freeze–thaw resistance of pure waste dolomite slag-based concrete (PWDSC). In this study, X-ray diffraction (XRD) and the lithofacies method (LM) confirmed that the tested samples were pure dolomite. The rock cylinder method (RCM) and rapid preliminary screening testing for carbonate aggregates (AAR-5) were employed to determine the alkali activity of pure dolomite: the RCM indicated a variation of −0.09% in length during the 84-day test period, the AAR-5 exhibited a length expansion rate of 0.03% within 28 days, and the expansion rates were less than 0.1%. These findings suggest that pure waste dolomite slag (PWDS) does not possess alkali activity. The freeze–thaw cycle test showed no significant spalling on the concrete surface, the inside of the cement produced few micro-cracks according to scanning electron microscopy (SEM), and the uniaxial compressive strength (UCS) test showed a decrease of approximately 20% after 200 freeze–thaw cycles. The results verified that ACR does not occur in PWDS and that it can withstand freeze–thaw damage, to a certain extent, when used as concrete coarse aggregate.

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Alkali-silica reactions in granite-based aggregates: The role of biotite and pyrite

Cited by 13 publications

References 56 publications

Determination of Alkali Silica Reactivity (Asr) Potential of Aggregates in Khairpur Region

Determination of Alkali Silica Reactivity (Asr) Potential of Aggregates in Khairpur Region

Research on alkali-carbonate reaction (ACR) and damage of freeze-thaw for pure dolomite as concrete coarse aggregate

The Risk of Alkali–Carbonate Reaction and the Freeze–Thaw Resistance of Waste Dolomite Slag-Based Concrete

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