Comparative analysis of fly ash effect with three different method in mortars that are exposed to alkali silica reaction

Yıldırım, Korkmaz; Sümer, Mansur

doi:10.1016/j.compositesb.2014.01.004

Cited by 10 publications

(1 citation statement)

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“…Ratio of alkali amount of cement used in the test was (Na2O+0.658(K2O)) = 0.22*0.658*0.46=0.52 (Na2O), which is below the value of 0.6%. [10]. Alkali levels of cement and mineral additives are presented in Table2.…”

Section: 1materials Used In the Experiments And Their Propertiesmentioning

confidence: 99%

Alkali̇ Si̇li̇ka Reaksi̇yonunun Azaltilmasinda Dört Farkli Mi̇neral Katki Kombi̇nasyonunun Opti̇mi̇sazyonu

Yıldırım¹,

Sümer²

2018

SAÜ Fen Bilimleri Enstitüsü Dergisi

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Presence of alkali silica in aggregates that are used in concrete production causes formation of cracks and decrease of performance over time in concrete.The first damage caused by ASR in Turkey had been observed in certain highway bridges in Izmir locality in 1995. It was found that some aggregates in other regions of Turkey also have a character to cause ASR.The purpose of the study was to minimize potential alkali silica reaction expansion in concrete and mortars produced with the aggregates that are used in constructions in our region.Accelerated mortar bar test method was employed in the study. It was observed in experimental study that that the use of 20-25% fly ash, 25-35% blast furnace slag and 10% silica fume and metakaolin as mineral additive reduced ASR.According to optimization studies, it is appropriate to use 5-10% silica fume, 5% metakaolin, 10-15% blast furnace slag and 10-20% fly ash as mineral additive in optimum mixtures giving ideal expansion value.It was found that the use of 65% of cement together with 35% silica fume, metakaolin, blast furnace slag and fly ash in mineral additive combinations prevents ASR.

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Section: 1materials Used In the Experiments And Their Propertiesmentioning

confidence: 99%

Alkali̇ Si̇li̇ka Reaksi̇yonunun Azaltilmasinda Dört Farkli Mi̇neral Katki Kombi̇nasyonunun Opti̇mi̇sazyonu

Yıldırım¹,

Sümer²

2018

SAÜ Fen Bilimleri Enstitüsü Dergisi

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Concrete containing recycled concrete coarse aggregate and crushed glass sand: Mitigating the effect of alkali–silica reaction

Gholampour,

Memarzadeh,

Nematzadeh

et al. 2024

Structural Concrete

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The utilization of recycled concrete and glass aggregates in concrete production has emerged as a highly promising method to significantly increase the recycling rate of waste materials. However, the interaction between alkaline environment and silica present in concrete detrimentally impacts mechanical properties and durability of the concrete due to the significant silica content of the aggregates. This study aims to develop a high‐performance and sustainable concrete to resist alkali–silica reaction (ASR). The study focuses on the use of a blend of ground granulated blast furnace slag (GGBS) and fly ash (FA) as binder materials to mitigate negative effects of the ASR on the mechanical properties and and durability of concrete made with crushed glass sand and coarse recycled concrete aggregate (RCA). Various tests, including ASR expansion, flow, slump, density, compression, three‐point bending, water absorption, and chloride attack, were conducted. Furthermore, microanalysis using scanning electron microscopy and energy‐dispersive x‐ray spectroscopy was performed. Based on the results, it is found that the GGBS is less effective than the FA in reducing the ASR expansion of the concrete, with only 3%, 9%, and 12% decreased expansion as a result of the addition of 20%, 40%, and 70% GGBS to the concrete containing 30% FA, respectively. It is also shown that combining 20% GGBS with 30% FA in the RCA concrete containing glass sand develops similar compressive and flexural strengths and water absorption compared to that containing natural sand. This can be related to the pozzolanic reaction of the FA and GGBS, which helps to retain the alkalis for reducing the crack development and propagation in the concrete. However, further GGBS content leads to a decrease in the strengths and an increase in the water absorption of the concrete. The results of this study point to the significant potential of combining FA and GGBS at an optimum ratio to mitigate the ASR effect on RCA concretes containing crushed glass sand. This approach helps in minimizing the emission of greenhouse gases and other pollutants generated during cement production, thereby mitigating environmental pollution. Additionally, it helps the preservation of natural resources by reducing the depletion of natural sand and coarse aggregate.

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Recent durability studies on concrete structure

Tang

Yao

Andrade

2015

Cement and Concrete Research

450

121

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Comparative analysis of fly ash effect with three different method in mortars that are exposed to alkali silica reaction

Cited by 10 publications

References 1 publication

Alkali̇ Si̇li̇ka Reaksi̇yonunun Azaltilmasinda Dört Farkli Mi̇neral Katki Kombi̇nasyonunun Opti̇mi̇sazyonu

Alkali̇ Si̇li̇ka Reaksi̇yonunun Azaltilmasinda Dört Farkli Mi̇neral Katki Kombi̇nasyonunun Opti̇mi̇sazyonu

Concrete containing recycled concrete coarse aggregate and crushed glass sand: Mitigating the effect of alkali–silica reaction

Recent durability studies on concrete structure

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