Effect of alkali release by aggregates on alkali-silica reaction

Drolet, Cédric; Duchesne, Josée; Fournier, Benoît

doi:10.1016/j.conbuildmat.2017.09.085

Cited by 25 publications

(8 citation statements)

References 14 publications

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“…Sodium-free pozzolans are more appropriate since high concentrations of Na 2 O stimulate alkali-aggregate reactions in concrete and mortars, which contributes to the expansion of the mix. On the other hand, the presence of K 2 O does not significantly affect expansion [34]. Therefore, the composition of the waste investigated contributes to the durability of the cementitious compounds, especially those subjected to alkali-aggregate reactions.…”

Section: Resultsmentioning

confidence: 98%

Evaluation of the pozzolanic activity of red ceramic waste using mechanical and physicochemical methods

et al. 2019

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Alternative cementitious materials can potentially reduce the environmental impact of the extraction of lime and the hazardous production of Portland cement. Red ceramic waste can be comminuted to fine particles with both filler and pozzolanic activity and used in Portland and lime mortars. This study presents the evaluation of the pozzolanic activity of red ceramic waste by physicochemical and mechanical methods using Portland cement and lime mortars. The evaluated waste depicted high pozzolanic activity and absence of Na2O, and consumed 32% of CaO according to the adapted Chapelle test. The compressive strength recorded in the pozzolanic activity test with lime was 7.1 MPa at 7 days. Moreover, the compressive strength of mixes with 25% replacement of Portland cement by red ceramic waste was 11% higher than the reference waste-free composition. The red ceramic waste depicted adequate characteristics to be used in the production of large volumes of Portland and lime mixes commonly employed in the civil construction.

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Section: Resultsmentioning

confidence: 98%

Evaluation of the pozzolanic activity of red ceramic waste using mechanical and physicochemical methods

et al. 2019

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“…This might be due to the metamorphic nature of the rock. The alkali release from Springhill coarse aggregate was studied and there was no evidence of released alkalis into pore solution which might be due to the alkali uptake for the formation of ASR gel (Drolet, Duchesne and Fournier, 2017). Moreover, alkali release from aggregates was found to be higher in 0.7 M NaOH or KOH solutions compared to saturated lime solutions (Bérubé et al, 2002).…”

Section: Alkali Release From Aggregatesmentioning

confidence: 95%

“…The results are the average of three tested samples and are summarized in (Na2O = 0.0180%, K2O = 0.0198%) followed by Sudbury (Na2O = 0.0115%, K2O = 0.0129%) and then Spratt (Na2O = 0.0019%, K2O = 0.0032%) which had much lower alkali release compared to the other two aggregates. Springhill, Sudbury and Spratt aggregates have a total alkali content of 3.47%, 4.35% and 0.09% Na2Oe by aggregate mass, respectively (Bérubé et al, 2002;Drolet, Duchesne and Fournier, 2017). This could, partly, explain the higher alkali leaching from concrete It is clear that the amount of soluble alkalis is lower than the alkalis released in NaOH and KOH solutions with all the different aggregates.…”

Section: Alkali Release From Aggregatesmentioning

confidence: 96%

“…3) Springhill aggregate consisting of greywacke obtained from New-Brunswick contains reactive silica. The principal minerals in this aggregate are: Calcite, Muscovite, Chlorite, plagioclase Feldspar and Dolomite (Drolet, Duchesne and Fournier, 2017). The 1-year CPT expansion of concrete prisms cast with Springhill is 0.22% (Johnson and Shehata, 2016).…”

Section: Coarse Aggregatementioning

confidence: 99%

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Development of Enhanced Test Methods to Evaluate Alkalisilica Reaction in Concrete

Sinno¹

2021

Preprint

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Many preventive measures showed improved performance of concrete against alkali-silica reaction (ASR) based on the concrete prism test (CPT) described in the Canadian and American Standards, CSA A23.2-14A and ASTM C1293. However, research has shown that preventive measures that limited the 2-year expansion in the concrete prism test produced late expansion after 7-15 years when tested in the field. The objective of this research is to understand the possible reasons for this late expansion under field conditions and to come up with modified approach to determine the level of supplementary cementing materials (SCM) needed to mitigate the long-term expansion. The research mainly focuses on studying two possible reasons to explain the late expansion. The first reason is the rate and ultimate hydration of SCM, where their capacity to bind alkalis under CPT could be higher than those under field conditions. The other reason for the late expansion could be the geometry and size of the CPT samples which might reduce the expansion due to the excessive alkali leaching. Larger samples showed less leaching compared to standard prisms. 100-mm cylinders showed higher expansion than 75-mm standard prisms; however, both sample shapes showed similar expansions for one tested aggregate when used with SCM. In addition, the capacity of SCM to bind alkalis was shown to be higher at 38ºC compared to the other two tested temperatures investigated in this study: 23ºC and 60ºC. Samples with SCM at high replacement levels expanded more at 60ºC compared to 38ºC. Due to their reduced leaching compared to prisms, testing cylinders at 60ºC showed accelerated results reducing the testing duration to one year compared to the standard test duration of two years. Moreover, a new way to predict the minimum levels of SCM required to mitigate expansion due to alkali-silica reaction is presented showing better correlation with the field. Finally, a fast and reliable test method is suggested to evaluate the reactivity of mineral fillers by adapting and adopting the current test methods available for ASR testing.

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“…Resistance toward ASR depends on certain factors such as 1) availability of the reactive silica in the system 2) alkalis in the pore solution 3) availability of water [26,27]. Some literature also points out the importance of permeability of the mortar/concrete, where more permeable structures are more prone to the formation of the ASR gel [28,29]. The present work aims to completely replace the fine aggregate with processed Cu slag, further designated as the Modified Ferro Silicate (MFS) slag.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study on the Use of Modified Copper Slag as a Sustainable Fine Aggregate in Mortar

Sivakumar¹,

ruyaert²,

Belie³

et al. 2021

RPM

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Depending on the availability of aggregate sources pertaining to their geographic locations, the concrete industry utilizes conventional aggregates such as marine sand, dredged gravel, or crushed rocks. This method requires high energy and high processing costs for washing and grinding. The objective of this work is to use Modified Ferro silicate slag (MFS), a by-product obtained from the copper industry, as an alternative to the conventional fine aggregates found in mortar. No additional processing such as washing or grinding is required. By using the MFS slag as an aggregate in mortar or concrete, the factors of sustainability and a circular economy are enhanced. The current study focuses on the characterization of the MFS slag, including the mortar mixes with the MFS slag as a fine aggregate, and shows that the MFS slag can be a promising raw material to replace conventional aggregates in mortar. The leaching of its heavy elements such as Sb, As, Cr, Mo, Pb, and Zn was conducted well within limits (VLAREMA 4). The SEM and MIP analyses indicated that the porosity of the MFS slag mortar was higher compared to the standard aggregate mortar. Moreover, the MFS slag mortar showed acceptable resistance toward the alkali-silica reaction and carbonation.

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Effect of alkali release by aggregates on alkali-silica reaction

Cited by 25 publications

References 14 publications

Evaluation of the pozzolanic activity of red ceramic waste using mechanical and physicochemical methods

Evaluation of the pozzolanic activity of red ceramic waste using mechanical and physicochemical methods

Development of Enhanced Test Methods to Evaluate Alkalisilica Reaction in Concrete

Feasibility Study on the Use of Modified Copper Slag as a Sustainable Fine Aggregate in Mortar

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