Artificial pozzolanic cement pastes containing burnt clay with and without silica fume

Amin, M.S.; Abo-El-Enein, S.A.; Rahman, Adel Abdel; Alfalous, Khaled A.

doi:10.1007/s10973-011-1676-5

Cited by 55 publications

(28 citation statements)

References 28 publications

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“…at 820-850 °C in correspondence of a large mass decrease due to CO2 evolution and the conversion of CaCO3 to CaO. In addition, the samples Cal-SA Cal-FS, and Cal-FS-P show an extra shoulder at around 770 °C, related to the transformation of amorphous CaCO3 to CaO [39,40]. The thermograms also confirm the previous hypothesis about the presence of SiO2 and silicates in the coatings.…”

Section: Sinteringsupporting

confidence: 84%

Hydration induced morphological change on proppant surfaces employing a calcium-silicate cement system

Correas

Wright

Andreoli

et al. 2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Sinteringsupporting

confidence: 84%

Hydration induced morphological change on proppant surfaces employing a calcium-silicate cement system

Correas

Wright

Andreoli

et al. 2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…2 also show that the paste made of Mix ES (90% OPC + 6% EAFS + 4% SF) possesses the highest combined water contents at intermediate and later stages of hydration as Physico-chemical characteristics of blended cement pastes compared to those of the other mixes (blank, E1, E2, E3 and E4) indicating the higher pozzolanic activity of silica fume with the free lime liberated from OPC hydration leading to the formation of excessive amounts of CSH with higher water contents. Obviously, the Wn-values with age of hydration show almost the same trend observed for the changes in the values of compressive strength [7]. Fig.…”

Section: Hydration Kineticssupporting

confidence: 72%

“…The presence of silica fume causes a notable improvement in the mechanical properties for the hardened paste of Mix ES as compared to Mix E3; Silica fume consists of very fine amorphous particles, large surface area, high SiO 2 content and acts as a very reactive pozzolana when used as a blend in cement and concrete. Silica fume plays two important roles: (i) it acts as a filler, due to its fine particle size, fills the spaces between the cement grains and this effect reduces the pore size and (ii) it acts as a pozzolanic material due to its ability to react with free lime liberated from the hydration of OPC leading to the formation of additional amounts of calcium silicate hydrates with a consequent increase in compressive strength [7].…”

Section: Resultsmentioning

confidence: 99%

“…It consists of 95% amorphous silica with a very high surface area; these characteristics increase its pozzolanic activity [7,8]. Metakaolin (MK) is ultrafine artificial pozzolana powdered form of anhydrous alumino-silicate derived from the calcination of raw kaolin at a specific temperature range to form a phase transition which is highly disordered, amorphous and with pozzolanicity [9].…”

Section: Introductionmentioning

confidence: 99%

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Physico-chemical characteristics of blended cement pastes containing electric arc furnace slag with and without silica fume

et al. 2015

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Filled-pozzolanic cement pastes were made by different replacements of OPC by electric arc furnace slag (EAFS) with silica fume (SF) at water/cement ratio of 0.27. The pastes were hydrated up to 90 days. At each time interval, the physico-chemical characteristics of the hardened cement pastes were studied and related to the structure of the hardened pastes and the role of EAFS replacement as a filler in the hardened OPC-EAFS pastes. It was found that the optimum replacement of OPC by EAFS for the improvement in hydraulic properties of filled cement pastes is 6%. High replacement of OPC by EAFS (10% or 15%) causes a notable deterioration in the compressive strength at all ages of hydration. The replacement of EAFS in Mix (90% OPC + 10% EAFS) by 4% SF causes a marked improvement in the mechanical properties for the hardened pastes of Mix (90% OPC + 6% EAFS + 4% SF). The DSC thermograms for all pastes indicated the formation of nearly amorphous calcium silicate hydrates, calcium sulphoaluminate hydrates, calcium aluminate hydrates and portlandite. The SEM micrographs showed that the partial substitution of OPC by EAFS and/or SF leads to more dense structures as compared to the neat OPC paste. ª 2014 Production and hosting by Elsevier B.V. on behalf of Housing and Building National Research Center.

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“…The paste made of Mix M3 (90% OPC + 10% NMK) possesses the highest strength values at all hydration ages as compared to the other pastes containing 0%, 4%, 6% and 15% NMK. The notable increase in the values of compressive strength for the OPC pastes containing different amounts of NMK may be attributed to the following mechanism: when water is added to each OPC-NMK mixture, free calcium hydroxide liberates as a result of initial hydration of OPC fraction, the silica and alumina of NMK go into solution quickly and react to form secondary hydration products (mainly as calcium silicate hydrate) together with formation of hexagonal calcium aluminate hydrate (mainly as C 4 AH 13 ) which are precipitated as soon as saturation is approached [22]. For hardened paste made of mix M4 (85% OPC + 15% NMK) the results of compressive strength indicate relatively low strength values than those obtained for all of the tested mixes, Fig.…”

Section: Compressive Strengthmentioning

confidence: 99%

Hydration characteristics and compressive strength of hardened cement pastes containing nano-metakaolin

2017

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In this study the effect of inclusion of nano-metakaolin (NMK) to ordinary Portland cement (OPC) on the hydration characteristics and microstructure of hardened OPC-NMK pastes was studied. The OPC-NMK blends were prepared by the partial substitution of OPC by NMK (4, 6, 10 and 15 weight %). The fresh pastes were made using an initial water/solid (W/S) ratio of 0.27 by weight and then hydrated for various time intervals. At the end of each hydration time, the hardened blended cement pastes were tested for compressive strength, free lime content, combined water content, X-ray diffraction (XRD) analysis, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The compressive strength results revealed that the inclusion of nano-metakaolin into OPC improved the mechanical properties of NMK-OPC pastes during almost all ages of hydration, especially with the paste containing 10 wt% NMK. The compressive strength values obtained for OPC paste blended with 4% silica fume (SF) and 6% NMK are comparable to those of the neat OPC paste. The DSC thermograms and XRD diffractograms obtained for some selected hardened pastes indicated the formation of amorphous calcium silicate hydrates, calcium sulfoaluminate hydrates, calcium aluminate hydrate and calcium hydroxide. SEM micrographs showed the formation of a dense microstructure for the hardened OPC-NMK and OPC-NMK-SF pastes as compared to the neat OPC paste after 90 days of hydration. ª 2015 Production and hosting by Elsevier B.V. on behalf of Housing and Building National Research Center. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/ by-nc-nd/3.0/).

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Artificial pozzolanic cement pastes containing burnt clay with and without silica fume

Cited by 55 publications

References 28 publications

Hydration induced morphological change on proppant surfaces employing a calcium-silicate cement system

Hydration induced morphological change on proppant surfaces employing a calcium-silicate cement system

Physico-chemical characteristics of blended cement pastes containing electric arc furnace slag with and without silica fume

Hydration characteristics and compressive strength of hardened cement pastes containing nano-metakaolin

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