Strength, permeability and shrinkage cracking of silica fume and metakaolin concretes

Güneyisi, Erhan; Gesoğlu, Mehmet; Karaoğlu, Seda; Mermerdaş, Kasım

doi:10.1016/j.conbuildmat.2012.02.017

Cited by 247 publications

(110 citation statements)

References 22 publications

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“…The additional pozzolanic reaction (by converting Ca(OH) 2 to extra calcium silicate hydrate in the accessible pore microstructure of the hardened cement paste) explains the MK and SF effect as compared to their reference mixtures. This is in agreement with the established fact in the literature [30,31].…”

Section: Fig 6 Mean Values Of Compressive Strength In Terms Of Simisupporting

confidence: 82%

Long term mechanical properties of self-compacting concrete made with slag cement and supplementary cementitious materials

Mir¹,

Nehme²

2017

Epitoanyag - JSBCM

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self-compacting concrete (scc) is becoming more popular in terms of application and innovation in the building industry. Durable concrete structures can be established when scc is used with the proper mix design and selection of materials. the amount and type of filler or supplementary cementitious materilas (scms) are among the most important parameters affecting the fresh and hardened properties of scc. mainly, scms improve the hydration of cement due to their physical characteristics and chemical compositions, thus a more sustainable and eco-friendly scc product could be achieved by the substitution of cement clinker by scms. the aim of this study was to evaluate the effect of total powder content, cement content and scms type on the fresh and hardened properties of scc. the compressive strength, splitting tensile strength, modulus of elasticity and total porosity properties were the experimental tests carried out in this investigation. the finding of this study showed that the compressive strength of scc with metakaolin (mk) gives higher values, as compared to mixtures with silica fume (sF), at the age of 400 days. mk and sF showed a negligible effect on the splitting tensile strength and modulus of elasticity, as compared to the reference mixtures. total porosity test results were lower with the increase of total powder content and by the addition of scms. keywords: self-compacting concrete, mechanical properties, sustainability, metakaolin, silica fume

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Section: Fig 6 Mean Values Of Compressive Strength In Terms Of Simisupporting

confidence: 82%

Long term mechanical properties of self-compacting concrete made with slag cement and supplementary cementitious materials

Mir¹,

Nehme²

2017

Epitoanyag - JSBCM

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“…Szakirodalmi adatok alapján a portlandcement tömegének 8-20 tömeg%-a helyettesíthető metakaolinnal [7][8][9][12][13][14][15][16][17][18][19][20][21][22]. …”

Section: A Metakaolinunclassified

Analysis of metakaolin as supplementary cementing material by the k-value concept

Borosnyói¹,

Szijártó²

2016

Epitoanyag - JSBCM

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Analysis of metakaolin as supplementary cementing material by the k-value concept Present paper studies metakaolin as a supplementary cementing material (scm) for concrete in terms of compressive strength development and k-value concept of cen/tr 16639:2014. sixteen different concrete compositions are studied in the range of water-to-cement ratio of w/c = 0.50-0.65. results indicate that the effectiveness of metakaolin depends on the applied w/c-ratio and the applied cement substitution ratio; the smaller the w/c-ratio, the more effective the metakaolin; the higher the cement substitution ratio, the less effective the metakaolin. the k-value decreases by the increase of w/c-ratio, independently of the age of concrete. the higher the cement substitution ratio, the smaller the k-value. the k-value tends to reach a final value in time. keywords: concrete, metakaolin, supplementary cementing material, strength, k-value concept kulcsszavak: beton, metakaolin, cement kiegészítő anyag, szilárdság, k-érték elve betontechnológia, cement kiegészítő anyagok (scm). BevezetésAz egyik leggyakrabban alkalmazott és legszélesebb körben felhasznált építőanyagunk a beton. A betonipar évente több mint 4 milliárd tonna cement előállítását igényli a világon. A cementgyártás környezetterhelése viszonylag nagy, amelynek oka a nagy nyersanyag-és energiaigény, illetve a szén-dioxid kibocsátás [1]. Egy tonna portlandcement előállítása átlagosan 830 kg szén-dioxid (CO 2 ) kibocsátással jár, amely a globális felmelegedésre hatást gyakorol. A cementgyártás az antropogén eredetű CO 2 kibocsátás mintegy 4-7%-áért felelős. Napjainkban a betontechnológiai kutatások egyik kiemelt célja olyan építőanyagok előállítása, amelyekkel csökkenthető a cementgyártás által kialakuló környezetszennyezés. A CO 2 kibocsátás csökkentésére alkalmazott egyik módszer (az újrahasznosított adalékanyagok alkalmazásán [2-6] túlmenően), hogy a cement egy részét helyettesítik más, reakcióképes anyagokkal, ún. cement kiegészítő anyagokkal. Ezek az anyagok többnyire ipari melléktermékek, gyártásuk a cementipar számára nem jár többlet CO 2 kibocsátással.A beton egyes tulajdonságainak javítása vagy különleges tulajdonságok elérése céljából a betonban felhasznált, a portlandcement részleges helyettesítésére szolgáló, finom szemű szervetlen alkotóanyagokat nevezzük általánosságban cement kiegészítő anyagnak. A cement kiegészítő anyagoknak két csoportját különböztetjük meg: I. típusú kiegészítő anyagok a kö-zel inert kiegészítő anyagok, míg II. típusú kiegészítő anyagok a puccolános vagy latens hidraulikus tulajdonságú kiegészítő anyagok. Ez utóbbi csoportba tartozik az erőműi pernye, a szilikapor, az őrölt kohósalak és a metakaolin. A metakaolinA metakaolin az aluminoszilikátok csoportjába tartozó agyagásvány. Szilikátkémiai jele: AS 2 (sztöchiometriai képlete: Al 2 Si 2 O 7 vagy Al 2 O 3 ·2SiO 2 ). A kaolin agyagásvány termikus aktiválásával állítják elő. A metakaolin puccolános tulajdonságokkal rendelkező anyag, szemcsemérete általában kisebb, mint a cementé. A metakaolin á...

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“…Poon et al [3] performed experimental studies on the degree of reaction of MK for MK blended cement paste and showed that at early curing ages, the rate of reaction of MK in cement-MK blends was higher than silica fume in cement-silica fume blends. Güneyisi et al [4] and Wong [5] pointed out that the compressive strength was improved in MK blended concrete due to the pozzolanic reaction of MK. Ferreira et al [6] and Poon et al [7] stated that chloride diffusivity decreased as MK replacement levels increased.…”

Section: Introductionmentioning

confidence: 99%

“…Considerable experimental studies have been performed regarding material characteristics, hydration, and the mechanical and durability properties of metakaolin (MK) blended concrete [2][3][4][5][6][7][8][9][10]. Bai et al [2] reported that MK blended concrete had a lower slump than control concrete because MK has a higher specific surface than cement.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydration-Mechanical-Durability Properties of Metakaolin Blended Concrete

Wang

2017

Applied Sciences

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Metakaolin (MK) is a highly active pozzolanic material and MK is increasingly used in producing high performance concrete.This study presents an integrated hydration-mechanical-durability model for evaluating various properties of metakaolin blended concrete. First, a blended hydration model is proposed for simulating the hydration of composite binders containing MK that considers the dilution effect and pozzolanic reaction due to metakaolin addition. The interactions between the metakaolin reaction and cement hydration were taken into account by means of the contents of calcium hydroxide and capillary water in hydrating the composite binder. The reaction degrees of cement and metakaolin were calculated using the hydration model. Second, the gel-space ratio of the MK blended concrete was determined based on the reaction degrees of the composite binders and proportions of concrete mix. Moreover, concrete compressive strength was calculated using the gel-space ratio. Third, the volumetric phase fractions were calculated based on the reaction degrees of the binders. Chloride penetrability of metakaolin blended concrete was analyzed through the capillary porosity of concrete. The proposed integrated hydration-mechanical-durability model is valuable for the material design of metakaolin blended concrete.

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Strength, permeability and shrinkage cracking of silica fume and metakaolin concretes

Cited by 247 publications

References 22 publications

Long term mechanical properties of self-compacting concrete made with slag cement and supplementary cementitious materials

Long term mechanical properties of self-compacting concrete made with slag cement and supplementary cementitious materials

Analysis of metakaolin as supplementary cementing material by the k-value concept

Analysis of Hydration-Mechanical-Durability Properties of Metakaolin Blended Concrete

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