Benefits of metakaolin over microsilica in developing high performance concrete

Kalpana, M.; Vaidevi, C.; Vijayan, D. S.; Benin, S.R.

doi:10.1016/j.matpr.2020.06.566

Cited by 10 publications

(7 citation statements)

References 5 publications

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“…Commonly used blending components include fly ash (FA), rice husk ash (RHA), granulated slag (GS), silica fume (SF), calcined clay (CC), and construction debris waste (CDW) powder [6][7][8][9][10][11][12]. There have been extensive studies reporting their suitability and application range as potential cementitious materials for green concrete [13][14][15][16][17][18][19][20]. Generally speaking, each of them vary in their micro-structural features, elemental compositions and therefore, inevitably, in their chemical reactivity with water.…”

Section: Introductionmentioning

confidence: 99%

“…Advantages and working range of bagasse ash and fly ash were also studied as potential replacement as cementitious materials with remarkable performance on the compressive strength of the concrete [8][9]. On the other hand, the micro-structural properties of metakaolin and micro-silica are found to benefit the calcite-bonding of high performance concrete when they applied separately [10][11][12][13][14][15][16]. In the absence of micro-fibres, metakaolin has reported higher strength and durability characteristics compared to the micro-silica mixtures [13,16].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the micro-structural properties of metakaolin and micro-silica are found to benefit the calcite-bonding of high performance concrete when they applied separately [10][11][12][13][14][15][16]. In the absence of micro-fibres, metakaolin has reported higher strength and durability characteristics compared to the micro-silica mixtures [13,16].…”

Section: Introductionmentioning

confidence: 99%

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A Compensatory Approach for Enhancing the Strength and Durability of Green Concrete Composites (GCC) with Multiple Combinations of Recyclable Pozzolanic Materials (RPM)

ARIYAGOUNDER,

MANGOTTIRI

2023

Preprint

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Recyclable Pozzolanic materials (RPM) derived from wastes are increasingly used in mortar and concrete for a number of purposes, chief among them being the reduction of cement quantity, which lowers construction costs as well as carbon footprint. Among these, the most often used mixture ingredients in concrete are fly ash (FA), rice husk ash (RHA), palm oil fuel ash (POFA), granulated slag (GS), silica fume (SF), construction debris waste powder (CDW), and calcined clay (CC). Recent studies reveal that they are reasonable to impart mechanical strength when applied individually; however, their combined effects are not extensively investigated due to the characteristic conflicts existing in their elemental composition and the resulting pozzolanic activities. We present a comprehensive evaluation of durability and strength properties of different combinations of binary and ternary replacements of specific pozzolanic components in varying amounts (5%, 10%, 15%, and 20%). These combinations were so chosen as to provide a compensatory effect on the apparent binding properties based on the difference in their geometry and composition. The results indicate that 5% of the ternary combination had good corrosion resistance and durability, whereas 10% of the single mode, 5% of the binary mode, and 5% of the ternary mode have high mechanical properties, durability, and resistance to corrosion. These insightful findings show that use of optimized mixtures of composite pozzolanic materials can improve the mechanical properties of concrete mixes by compensating each other for their intrinsic limitations, thereby ensuring higher sustainability towards green concrete applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Compensatory Approach for Enhancing the Strength and Durability of Green Concrete Composites (GCC) with Multiple Combinations of Recyclable Pozzolanic Materials (RPM)

ARIYAGOUNDER,

MANGOTTIRI

2023

Preprint

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“…The addition of MK as cementitious material in concrete shows excellent properties against penetration of various aggressive agents [4,5]. The accumulation of MK enhances the strength and durability of concrete [6,7,8]. The SCMs provide a variety of advantages in concrete, including improved ultimate strength, durability, reduced excessive surface cracking, cost savings, and greater sustainability.…”

Section: Introductionmentioning

confidence: 99%

Evaluating properties of high performance concrete containing metakaolin as cementitious material

Dubey

Deo

Ramtekkar

2022

IRASE

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High performance concrete is extensively used for construction works in recent era. For the preparation of high performance concrete (HPC) mineral and chemical admixtures are used. The addition of mineral admixtures minimizes the utilization of cement and makes concrete more sustainable. The addition of metakaolin as a substitute to cement enhances the properties of concrete. There is need to study the mechanical and micro-structural properties of concrete containing metakaolin as cementitious material. In this work an endeavour has been made to study the properties of HPC employing matakaolin as an alternative for cement. The cement has been replaced with metakaolin by 5%, 10%, 15%, 20%, and 25% respectively for 0.25, 0.3, and 0.35 w/c ratios. The strength and electrical resistivity tests are conducted for all concrete mixes on triplicate. Results confirm that the accumulation of metakaolin increases the properties of HPC. A maximum of 49% increase in compressive strength in concrete was observed by the accumulation of 15% of metakaolin in concrete as substitute to cement for 0.25 w/c ratio in comparison to standard concrete. The development of secondary calcium silicate hydrates and minimal Ca(OH)2 components was revealed by X-ray spectroscopy, indicating that the concrete was denser. The results of this study revealed that metakaolin has a considerable impact on high-performance concrete, particularly in terms of compressive and flexural strength.

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“…Наиболее простым и доступным фактором управления структурой цементного композита представляется использование химических добавок различной природы (неорганической и органической), морфологии и дисперсности. Наиболее часто в качестве неорганических добавок используются активные минеральные добавки, например, микрокремнезем, микроглинозем, метакаолин [4], а также продукты химического синтеза, например, нитрат, нитрит и хлорид кальция, натриевое жидкое стекло, хлорид аммония [5] и т. п. Различные поверхностно-активные вещества, в частности, супер-и гиперпластификаторы, являются типичными представителями органических добавок [5,6]. Кроме того, для улучшения физико-механических свойств цементных композитов все чаще используются дисперсноармирующие компоненты -полипропиленовые, стеклянные, базальтовые или стальные волокна [7][8][9].…”

Section: Introductionunclassified

Investigation of the effect of a multicomponent additive on the structure formation and hardening of cement composites

Shvedova

Artamonova²,

Slavcheva³

2022

kcmf

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The development and application of multicomponent multifunctional additives for cement composites is an important research area since the use of such additives allows controlling both the rheological properties of the freshly prepared mixture and the physical and mechanical characteristics of the finished composite. This work proposes to use a multicomponent multifunctional additive with the composition of “SiO2 nanoparticle - superplasticiser - polypropylene fibre” for the modification of cement composite materials based on sand and chalky flour. We studied the peculiarities of the influence of this additive on the technological characteristics of mixtures (plasticity and form stability) and the processes of setting-up, hydration, structure formation, and strength gain of the composite materials. It was shown that the introduction of this additive allows increasing the plasticity limit and structural strength and reducing relative plastic deformations of the cement mixture at the manufacturing stage. At the same time, this additive accelerates the processes of setting-up, hydration, and strength gain of cement composites. It was proved that the increase in strength is due to the formation of a dense structure of hydrated new growths of the cement substance formed by phases of low and highly basic calcium silicate hydrates of various compositions and morphologies, as well as the absence of a portlanditephase.

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Benefits of metakaolin over microsilica in developing high performance concrete

Cited by 10 publications

References 5 publications

A Compensatory Approach for Enhancing the Strength and Durability of Green Concrete Composites (GCC) with Multiple Combinations of Recyclable Pozzolanic Materials (RPM)

A Compensatory Approach for Enhancing the Strength and Durability of Green Concrete Composites (GCC) with Multiple Combinations of Recyclable Pozzolanic Materials (RPM)

Evaluating properties of high performance concrete containing metakaolin as cementitious material

Investigation of the effect of a multicomponent additive on the structure formation and hardening of cement composites

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