Effect of metakaolin addition and seawater mixing on the properties and hydration of concrete

Li, Qiu; Geng, Haoran; Shui, Zhonghe; Huang, Yun

doi:10.1016/j.clay.2015.06.043

Cited by 105 publications

(33 citation statements)

References 37 publications

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“…Based on the results presented here, it can be concluded that seawater has a noticeable effect on increasing the hydration rate in the early stages of hydration and that this effect is even more pronounced when seawater is mixed with NS. As has been reported by Li et al (2015) and Parthasarathy et al (2017), the formation of CH in the early stages is promoted as a result of the acceleration of the hydration process by the chlorides in seawater. CH is therefore consumed at the early stage of hydration, due to the very high pozzolanic activity of NS, resulting in the production of a C-S-H phase.…”

Section: Hydration Kineticssupporting

confidence: 65%

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

et al. 2019

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This contribution investigates the effects of seawater and colloidal silica (NS) in the amounts of 1, 3 and 5 wt%, respectively, on the hydration, strength development and microstructural properties of Portland cement pastes. The data reveal that seawater has an accelerating effect on cement hydration and thus a significant contribution to early strength development was observed. The beneficial effect of seawater was reflected in an improvement in compressive strength for up to 14 days of hydration, while in the 28 days compressive strength values were comparable to that of cement pastes produced with demineralized water. The combination of seawater and NS significantly promotes cement hydration kinetics due to a synergistic effect, resulting in higher calcium hydroxide (CH) production. NS can thus react with the available CH through the pozzolanic reaction and produce more calcium silicate hydrate (C-S-H) gel. A noticeable improvement of strength development, as the result of the synergistic effect of NS and seawater, was therefore observed. In addition, mercury intrusion porosimetry (MIP) tests confirmed significant improvements in microstructure when NS and seawater were combined, resulting in the production of a more compact and dense hardened paste structure. The optimal amount of NS to be mixed with seawater, was found to be 3 wt% of cement.

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Section: Hydration Kineticssupporting

confidence: 65%

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

et al. 2019

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“…With a pH value of 7, water could not activate MK, which was activated later by calcium hydroxide formed during the hydration of cement in mortar. The improvement of compressive strength of mortar by MK was due to the accelerated hydration of cement, filler effect, and pore structure refinement by MK, as reported in previous studies (Li et al, 2015).…”

Section: Compressive Strengthsupporting

confidence: 81%

“…When MK was added into concrete, the compressive strength could be improved, permeability, and porosity could be decreased and pore structure could be refined due to the filler effect, acceleration of hydration, and pozzolanic reaction with CH to form C-S-H (Wild et al, 1996;Aquino et al, 2001;Lagier and Kurtis, 2007;Gueneyisi et al, 2008;Shui et al, 2010;Fernandez et al, 2011;Kadri et al, 2011). The compressive strength increased with the content of MK, and the maximum effect was reached at 28 days as observed by many researchers previously (Justice and Kurtis, 2007;Khatib, 2008Khatib, , 2009Arikan et al, 2009;Johari et al, 2011;Kadri et al, 2011;Antoni et al, 2012;Li et al, 2015). The early age (before 24 h) autogenous shrinkage of concrete decreased with the increase of content of MK due to the dilution effect of MK, although the longterm autogenous shrinkage of concrete containing MK could be higher than that of control specimen, due to the acceleration of Portland cement hydration, and pozzolanic reaction by MK with calcium hydroxide (Kinuthia et al, 2000;Brooks and Johari, 2001).…”

Section: Introductionmentioning

confidence: 68%

Effect of Pre-dispersing Metakaolin in Water on the Properties, Hydration, and Metakaolin Distribution in Mortar

Geng

Chen

et al. 2019

Front. Mater.

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The effects of pre-dispersing metakaolin (MK) in water on the properties and hydration of mortar and distribution of MK particles in mortar were characterized by analytical techniques. Zeta-potential of MK-water dispersion significantly decreased with the increase of pH of solution, resulting in a stable dispersion at pH of 8 with zeta-potential of −40 mV. The bulk density of MK-water slurry rapidly increased with water/MK ratio due to the surface tension force of water and filling of spaces by water, resulting in a maximum bulk density of 665.2 kg/m 3 at water/MK ratio of 1.0. Comparing to that of powder MK, pre-dispersing MK in water did not alter hydration products, slightly improved compressive strength, and pore structure, but further reduced shrinkage and significantly improved the uniformed distribution of MK particles in mortar.

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“…Many researchers have studied the properties of concrete hydration. Li et al studied the effects of substituting meta‐kaolin and mixing with seawater on the hydration properties of concrete. Meta‐kaolin improved compressive strength by modifying the pore structure.…”

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.

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Effect of metakaolin addition and seawater mixing on the properties and hydration of concrete

Cited by 105 publications

References 37 publications

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

Effect of Pre-dispersing Metakaolin in Water on the Properties, Hydration, and Metakaolin Distribution in Mortar

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

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