Synergistic effect of metakaolin and fly ash on properties of concrete

Sujjavanich, Suvimol; Suwanvitaya, Prasert; Chaysuwan, Duangrudee; Heness, Greg

doi:10.1016/j.conbuildmat.2017.08.072

Cited by 88 publications

(40 citation statements)

References 23 publications

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“…The results for OX50 and METAOX exhibited a similar trend, indicating that nanosilica OX50 had a higher impact on mechanical properties (and, particularly, on compressive strength) than A200. The mechanical characteristics at 28 days of all mixes with additives, with respect to the reference mortar, are coherent with the action of nanosilica and metakaolin, given the pozzolanic activity of these additions, as reported in [3,[9][10][11][12][15][16][17]. Additionally, the quick evolution of compressive and flexural strength with combined micro-and nano-additives seems to confirm a synergistic effect between them.…”

Section: Mechanical Characterisationsupporting

confidence: 80%

“…It is characterised by its fast strength evolution, accompanied by the densification of the microstructure at early ages [3,[9][10][11][12]. In particular, the incorporation of metakaolin has been associated with an enhanced durability in marine environments, as a consequence of pore refinement together with the immobilization of chlorides by means of the formation of Friedel's Salt [9,13]. Furthermore, improvements in terms of sustainability, thanks to the lower manufacturing temperatures compared to cement, have been highlighted [6,14].…”

Section: Introductionmentioning

confidence: 99%

“…There has been an important amount of research supporting the benefits of the use of microand nano-additives, in terms of the different properties of the resulting cement-based mortars and concrete. In the literature, the synergistic effect which has been found for a number of combinations of additives is especially relevant; this synergistic effect can contribute to further refinement of the porous network [9,[21][22][23]. Combinations of micro-and nano-additives can also produce an increase in the hydrate gel content at early ages.…”

Section: Introductionmentioning

confidence: 99%

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Service Life and Early Age Durability Enhancement due to Combined Metakaolin and Nanosilica in Mortars for Marine Applications

et al. 2020

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The addition of a range of micro- and nano-particles to high-performance concrete has been the focus of recent research. At present, studies are mainly aimed at designing customised mortars, providing them with specific properties for each application. Improving the durability of mortars is one of the main objectives in such research, as a result of increasing environmental concern. The research presented herein analyses the synergistic effect of nanosilica and metakaolin as additives on the service life of cement-based mortars subject to aggressive environments (i.e., chloride exposure) at early ages. The effects of the additives on the durability properties of submerged samples after two and three days of curing were analysed. Tests were conducted on several different properties: resistivity, porosity, mechanical properties, chloride diffusion, and service life. It is observed that metakaolin and nanosilica exhibit a synergistic effect as additives, which is related to porosity refinement and chloride ion binding capacity, which contributes to enhanced resistance against chloride penetration from very early ages.

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Section: Mechanical Characterisationsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Service Life and Early Age Durability Enhancement due to Combined Metakaolin and Nanosilica in Mortars for Marine Applications

et al. 2020

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“…Since the specific surface and pozzolanic activity index of metakaolin is superior to that of fly ash, the compressive strength results were higher. The pozzolanic materials form additional calcium silicate hydrate (C-S-H) by the reaction of pozzolan reactive silica and calcium hydroxide (CH) formed by cement hydration (Sujjavanich, Suwanvitaya, Chaysuwan, & Heness, 2017). While the use of pozzolan material at 25% increased the results, the use of pozzolan material at 50% started to affect the results negatively (Qasim, Hussein, & Banyhussan, 2020).…”

Section: Strength Resultsmentioning

confidence: 99%

High-temperature effects on white cement-based slurry infiltrated fiber concrete with metakaolin and fly ash additive

Aygörmez

Al-mashhadani

Canpolat

2020

rdlc

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In this study, the high flexural parameter properties of Slurry Infiltrated Fiber Concrete (SIFCON) were examined, as was the use of metakaolin and fly ash with PC CEM I 52.5 R (White Cement). 5 series were prepared and metakaolin and fly ash replaced PC CEM I 52.5 R at 25% and 50%. In this study, while researching White Cement in the production of SIFCON samples, metakaolin which is easy to obtain in kaolin-rich soils, and fly ash, which is a waste material, were also evaluated to reduce CO2 emission in cement production. 5% of steel fiber was used in all series and the results of 7 and 28 days flexural and compressive strengths and ultrasonic pulse velocity (UPV) were examined. Given the 28-day test period, a strength increase was observed in metakaolin-added samples, while lower results were obtained in fly ash-added samples since fly ash was not yet completely hydrated. After the 200, 400, and 600 °C high-temperature tests, the results of flexural and compressive strengths, UPV, and weight loss were examined. The increase in strength after 300°C can be caused by drying shrinkage of the matrix, whose C-S-H structure is not yet intact, and compression of the fiber wall. The conversion from Ca(OH)2 to CaO begins at about 400°C, and the C-S-H structure is quickly destroyed as it approaches 600°C. SIFCON samples have the highest mechanical and durability properties by replacing the metakaolin with White Cement by 25%. The lowest results were obtained by replacing the fly ash with White Cement by 50%.

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“…Research shows that metakaolin appears to work synergistically with other SCMs. Sujjavanich et al [47] observed that a ternary blend of cement, metakaolin and fly ash at a ratio of 80:10:10 yielded a more uniform fresh mix with good workability and a denser microstructure, with better performance in the hardened state in terms of durability, abrasion resistance, chloride permeability and steel corrosion risk. Vance et al [48] observed the synergistic effect of a blend of 10% limestone and 10% metakaolin, resulting in improved concrete compressive strength and significantly reduced CH content.…”

Section: Synergistic Behaviour Of Metakaolin and Its Wider Range Of Umentioning

confidence: 99%

Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

Bakera¹,

Alexander

2019

RILEM Tech Lett

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Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

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Synergistic effect of metakaolin and fly ash on properties of concrete

Cited by 88 publications

References 23 publications

Service Life and Early Age Durability Enhancement due to Combined Metakaolin and Nanosilica in Mortars for Marine Applications

Service Life and Early Age Durability Enhancement due to Combined Metakaolin and Nanosilica in Mortars for Marine Applications

High-temperature effects on white cement-based slurry infiltrated fiber concrete with metakaolin and fly ash additive

Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

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