Metakaolin and calcined clays as pozzolans for concrete: a review

Sabir, B. B.; Wild, S.; Bai, Jiping

doi:10.1016/s0958-9465(00)00092-5

Cited by 1,084 publications

(552 citation statements)

References 29 publications

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“…It is evident that the pozzolanic reaction combined with filler effect contributed to the reduction of the porosity of the concrete. 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.…”

Section: Absorptionmentioning

confidence: 99%

Effect of Metakaolin Content on the Properties of High Strength Concrete

Dinakar

Sahoo

Sriram

2013

Int J Concr Struct Mater

227

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

227

104

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“…The production of one ton of Portland cement requires about 4 GJ of energy and about 1.7 tons of raw materials (limestone and shale) which leads to environmental destruction and pollution problem (Malhotra 2000;Sabir et al 2001;Worrell et al 2001). There is a clear need to find materials which can be used as cement replacement material.…”

Section: Introductionmentioning

confidence: 99%

“…These materials consist of high silica content in non-crystalline form (Sabir et al 2001). Published data demonstrated that the use of pozzolan materials in concrete would result in ecological, technical and economic benefits (Hassan et al 2000;Khatri et al 1995;Malhotra et al 2000;Malhotra 1993;Mehta 2004;Yazıcı et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Metakaolin and rice husk ash were obtained by clacination of kaolin clay and burning of rice husk under controlled temperature, respectively (Sabir et al 2001;Chandrasekhar et al 2003). High strength concrete could be achieved by incorporating ground quartz sand and fine stone dust as a partial cement replacement in an autoclave curing system (Jaafar et al 2002;Yang et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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Use of Fine Ground Dune Sand as a Supplementary Cementing Material

Alhozaimy

Alawad

Jaafar

et al. 2014

Journal of Civil Engineering and Management

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Abstract. The process of Portland cement production is associated with high consumption of energy and resources. Therefore, there is a need to replace the Portland cement with environmental friendly materials. This study was conducted to determine the feasibility of using ground dune sand as cement replacement materials under different curing conditions. Portland cement was replaced by ground dune sand at five levels of replacement (0-40% by weight). The compressive strength of mortar under standard and autoclave curing conditions and the influence of different autoclave temperatures and durations were investigated. The microstructure of selected mixtures was analyzed by XRD and SEM. Results showed that the compressive strength under the standard curing decreased as the level of replacement increased. However, under autoclave curing compressive strength increased as the content of ground dune sand increased. XRD and SEM revealed the absence of calcium hydroxide and the formation of secondary calcium silicate hydrate. The improvement of compressive strength and the absence of calcium hydroxide under autoclave curing indicated that the pozzolanic reaction between silica of dune sand and calcium hydroxide occurred.Keywords: dune sand, autoclave curing, pozzolanic materials, compressive strength, XRD, SEM.

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“…In this case, metakaolin (MK) seems to be the main active element [6]. Many studies have been done about the effects of MK additions to cement mortars in order to achieve strength and durability [7], but there are not so many investigations on MKlime mortars and their influence on historic masonry requirements. On the other hand, lime-Portland cement blended mortars have frequently been used during the last two centuries for different situations.…”

Section: Introductionmentioning

confidence: 99%

Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry

Aguilar¹,

Olivares

2010

Cement and Concrete Research

105

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Lime-based mortars containing pozzolanic additions of metakaolin, sepiolite and white Portland cement are studied in order to determine their performance as historic masonry conservation mortars. Hydration products on metakaolin-lime blended mortars include stable and metastable phases. The presence of such products has been studied by means of DTA and XRD analysis, concluding that the selection between them is mainly related with the water-lime ratio. Sepiolite addition to metakaolin-lime mortars has shown to inhibit C 4 AH 13 formation. Therefore, the influence of phase distribution on the mechanical resistance is considered. Finally, compounds production on blended lime-white Portland cement was compared to natural hydraulic lime ones, and as a result, no remarkable differences appeared, apart from traces of possible cement Portland addition to the latter, usually not mentioned in the nominal composition supplied by the manufacturers of lime binders.

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Metakaolin and calcined clays as pozzolans for concrete: a review

Cited by 1,084 publications

References 29 publications

Effect of Metakaolin Content on the Properties of High Strength Concrete

Effect of Metakaolin Content on the Properties of High Strength Concrete

Use of Fine Ground Dune Sand as a Supplementary Cementing Material

Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry

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