Increasing concrete durability with high-reactivity metakaolin

Gruber, Karen A.; Ramlochan, T; Boddy, Andrea; Hooton, R.D.; Thomas, M D

doi:10.1016/s0958-9465(00)00097-4

Cited by 213 publications

(70 citation statements)

References 8 publications

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“…It was also observed earlier that the resistance to chloride ion penetration reduced significantly as the proportion of MK increased (Kim et al 2007;Boddy et al 2001). Also Gruber et al (2001) indicated that high reactivity MK substantially reduced chloride ion penetration in concrete and such reductions can be expected to have a substantial impact on the service life of reinforced concrete in chloride environments. Abbas et al (2010) explained that the addition of MK increased the system's capacity to bind chloride ions, thus reducing the free chloride ion availability.…”

Section: Chloride Permeabilitymentioning

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: Chloride Permeabilitymentioning

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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“…Data were presented in the form of 'apparent diffusion coefficients' calculated using Fick's second law of diffusion from chloride concentrationdepth profiles after 28, 90 and 140 days exposure to 1.0 mol/l NaCl solution. Two more recent publications [7,8] extend these periods to 365 and 1095 days. The apparent diffusion coefficients were reduced on increasing the exposure time and on decreasing the w/b ratio and showed marked decreases with increasing HRM content.…”

Section: Introductionmentioning

confidence: 99%

Progress of Carbonation in Chloride Contaminated Concretes

Wang¹,

Basheer²,

Nanukuttan³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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The paper reports the influence of the composition of Portland cement (PC) -pulverised fuel ash (PFA) -metakaolin (MK) binders on chloride ingress and strength retardation of PC -PFA -MK concrete exposed to synthetic seawater. PC -PFA -MK concrete covering four different total cement replacement levels (10%, 20%, 30% and 40%) and with various MK:PFA proportions was exposed to synthetic seawater for up to 1.5 years. The chloride concentration -penetration depth profiles and change in compressive strength of the concrete for a range of binder compositions and at various exposure times are compared with those of the control PC concrete. It is established that blending the binders in PC concrete and PC -PFA concrete with MK produces concrete with a reduced strength deterioration factor (SDF) and good resistance to chloride penetration when exposed to seawater. The results presented in this paper form part of an investigation into the performance of concrete incorporating both PFA and MK in the binder to produce high performance concrete. D

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“…This material is regarded to be a highly reactive pozzolan because its reaction with the Ca(OH) 2 generated during silicate hydration contributes to improvements in mortar and concrete mechanical strength and durability (4)(5)(6)(7)(8). The effect of the mineralogical properties of the kaolin used, the thermal treatment parameters and the degree of dehydroxylation on the pozzolanic activity of metakaloin has been the subject of a number of studies (9)(10)(11)(12).…”

Section: Materiales Y Procedimiento Experimentalmentioning

confidence: 99%

“…Este material ha sido considerado como una puzolana de alta reactividad ya que reacciona con el Ca(OH) 2 generado en la hidratación de los silicatos, contribuyendo al mejoramiento de propiedades tanto mecánicas como de durabilidad de los morteros y hormigones (4)(5)(6)(7)(8). El efecto de las propiedades mineralógicas del caolín, los parámetros del tratamiento térmico, el grado de deshidroxilación, entre otros factores, en la actividad puzolánica del metacaolín, ha sido objeto de diferentes investigaciones (9)(10)(11)(12); sin embargo, no se reportan estudios acerca de la influencia de la temperatura de tratamiento del caolín en el desempeño durable de las mezclas cementicias adicionadas.…”

Section: Introductionunclassified