Combined effect of metakaolin and sea water on performance and microstructures of concrete

Shi, Zhiguang; Shui, Zhong He; Li, Qiu; Geng, Haoran

doi:10.1016/j.conbuildmat.2014.10.023

Cited by 198 publications

(68 citation statements)

References 36 publications

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“…Similar conclusions have been reported elsewhere, when lower FA contents were incorporated into composites (Mohammed et al 2004;Shaikh and Dobson 2019). Studies performed by Shi et al (2015) and Cheng et al (2018) have also confirmed the synergistic effects of MK and seawater, which lead to an improvement in the mechanical and microstructural properties of the concretes produced. However, very promising results have been reported when GGBFS, cement and seawater have been combined.…”

Section: Introductionsupporting

confidence: 88%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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This study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Introductionsupporting

confidence: 88%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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show abstract

“…Kaolinitic clay is an aluminum silicate hydrate ðAl 2 Si 2 O 5 ðOHÞ 4 Þ, which suffers dehydroxylation when submitted to calcination at a temperature range of 500-800°C [5,6]; in this process the clay loses its long range order and becomes an amorphous, reactive material known as metakaolin ðAl 2 O 3 2SiO 2 Þ [1,7,8]. The use of metakaolin (MK), has been found to have several benefits on concrete performance, such as increased resistance to sulfate attack, improved early mechanical strength and reduction of alkali-silica induced expansion [5,9].…”

Section: Introductionmentioning

confidence: 99%

Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Uchima

Restrepo

Tobón

2015

Construction and Building Materials

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“…Seawater caused an increase in compressive strength initially without changing the pore structure. Shi et al studied the effect of 0–6% of meta‐kaolin and using sea water to mix concrete on hydration properties and concrete microstructures. Compressive strength increased by 33% in 28 days by adding 5% weight of meta‐kaolin.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and durability properties of concrete containing zeolite mixed with meta‐kaolin and micro‐nano bubbles of water

Zadeh

Saghravani

Asadollahfardi

2018

Structural Concrete

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This research investigates the effect of using pozzolans as a substitution for a part of cement in concrete sample production, and using micro‐nano bubbles of water as a replacement for water in the mixture of concrete samples. We also sought to determine the optimal combination of zeolite and meta‐kaolin mixed with micro‐nano bubbles of water on the mechanical and durability properties of concrete samples. The results of the experiments indicate that using 10% zeolite in the concrete samples increased compressive strength and flexural strength by 3.7 and 17.85%, respectively. It also decreased 30 min water absorption, 24 hr water absorption and chloride permeability by 4.34, 16.61, and 41.52%, respectively, at the age of 28 days compared to the control sample. In addition, samples containing micro‐nano bubbles of water with 50 and 100% replacement for water in mixed concrete increased the compressive strength by 8.82 and 13.2%, increased the tensile strength by 10 and 19.64%, and decreased 24‐hr water absorption by 14.13 and 18.96% at the age of 28 days compared to the control samples. The best outcomes were achieved with a combination of 10% zeolite, and 10% meta‐kaolin mixed with 100% micro‐nano bubbles of water, which increased compressive strength, tensile strength and flexural strength by 14.85, 18.37, and 5.92%, respectively, compared to the control sample. Moreover, it decreased 24‐hr water absorption and chloride penetration at the age of 90 days by 17.56 and 80.45%, respectively, as compared to the control sample.

show abstract

Combined effect of metakaolin and sea water on performance and microstructures of concrete

Cited by 198 publications

References 36 publications

The effects of seawater and nanosilica on the performance of blended cements and composites

The effects of seawater and nanosilica on the performance of blended cements and composites

Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Mechanical and durability properties of concrete containing zeolite mixed with meta‐kaolin and micro‐nano bubbles of water

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