Improving strength, drying shrinkage, and pore structure of concrete using metakaolin

Güneyisi, Erhan; Gesoğlu, Mehmet; Mermerdaş, Kasım

doi:10.1617/s11527-007-9296-z

Cited by 228 publications

(79 citation statements)

References 26 publications

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“…Sabir et al (2001) pointed out that there is a strong evidence that MK significantly influences the pore structure in pastes and mortars and produces substantial pore refinement leading to significant modifications to the water transport properties. Guneyisi et al (2008) explained that the reduction in water absorption is due to the beneficial effect of the filling effect of ultrafine MK as well as due to its pozzolanic reaction. It was also observed earlier by Badogiannis and Tsivilis (2009) that compared to PC concrete MK concretes significantly exhibited lower chloride and gas permeabilities and sorptivities.…”

Section: Absorptionmentioning

confidence: 99%

Effect of Metakaolin Content on the Properties of High Strength Concrete

Dinakar

Sahoo

Sriram

2013

Int J Concr Struct Mater

217

104

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This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constant water/binder ratio of 0.3. MK mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 MPa and 100 ± 25 mm. From the results, it was observed that 10 % replacement level was the optimum level in terms of compressive strength. Beyond 10 % replacement levels, the strength was decreased but remained higher than the control mixture. Compressive strength of 106 MPa was achieved at 10 % replacement. Splitting tensile strength and elastic modulus values have also followed the same trend. In durability tests MK concretes have exhibited high resistance compared to control and the resistance increases as the MK percentage increases. This investigation has shown that the local MK has the potential to produce high strength and high performance concretes.

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Section: Absorptionmentioning

confidence: 99%

Effect of Metakaolin Content on the Properties of High Strength Concrete

Dinakar

Sahoo

Sriram

2013

Int J Concr Struct Mater

217

104

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“…Typically, kaolin clay that is used in the production of metakaolin contains a high percentage (40-70%) of the clay mineral kaolinite, Al2Si2O5(OH)4 [11]. In its dehydroxylated form, metakaolin can be used in concrete to enhance mechanical properties and increase durability [12][13][14][15][16], while also improving the aesthetic appeal with its white color. The consensus within the literature is that metakaolin contributes to concrete performance in three ways [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The most common SCM used for this purpose is silica fume, and metakaolin has shown itself to be comparable to silica fume in ability to achieve high early-strength in concrete [13,15]. The aesthetic difference here being that silica fume tends to make the concrete darker with its gray color.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Materials for Transportation Infrastructures: Comparison of Three Commercially-Available Metakaolin Products in Binary Cementitious Systems

et al. 2018

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Abstract:Metakaolin is the only major natural pozzolan to be specified for use as a supplementary cementitious material in the United States. As a result, the metakaolin market for concrete has grown dramatically in the past 20 years. As of now, the specifications of up to 16 state departments of transportation allow for the use of commercially-available and high-reactivity metakaolin products. However, to the best of the authors' knowledge, no study has been performed to evaluate whether these products are comparable in their performance. Three commercially-available (U.S.) metakaolin products, each replacing 10%, 15%, and 20% of the cement content in concrete and mortar mixtures are studied. Concrete mixtures contained a cementitious content of 422 kg/m 3 , a coarse aggregate fraction of 985 kg/m 3 , and a water-to-cementitious ratio equal to 0.43. Varying levels of a superplasticizer were used to maintain a uniform workability between mixtures. Each mixture was subjected to the following tests: compression, split-cylinder tension, modulus of rupture, dynamic elastic modulus, rapid chloride-ion penetrability, alkali-silica reactivity, sulfate resistance, the coefficient of thermal expansion, and drying shrinkage. Benefits from the inclusion of metakaolin were highly product-dependent and include increases in mechanical strength. All metakaolin supplemented concrete mixtures benefitted from decreased permeability and increased resistance to chemical attacks, with the exception of the sulfate resistance of mortars including a metakaolin product with high fineness. The inclusion of any metakaolin at any replacement level increased the coefficient of thermal expansion of concrete specimens. Reasons for difference in performance between products are discussed, and predictors of quality are recommended.

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“…Mucho se ha investigado sobre el efecto del metacaolín en las propiedades del hormigón. Recientemente, Güneyisi et al (16) observaron que en un hormigón con un contenido de metacaolín del 30% la resistencia era mayor que en el material de control. Por su parte, Khatib et al (6,7) demostraron que la incorporación de un 10% de metacaolín en un hormigón elaborado con una mezcla de cemento y un 30% de escoria granulada de horno alto, molida (GGBS), mejoraba el desarrollo de la resistencia mecánica del material resultante.…”

Section: Introductionunclassified

“…The effect of metakaolin on concrete properties has been widely researched. Most recently, Güneyisi et al (16) reported that the concrete containing up to 30% metakaolin had higher strength than the control material. Khatib et al (6,7) showed that the introduction of 10% metakaolin in concrete containing 30% GGBS enhanced strength development.…”

Section: Introductionmentioning

confidence: 99%