Mechanical behavior of activated nano silicate filled cement binders

Shebl, S. S.; Allie, Lazbourne; Morsy, Mohamed; Aglan, H.

doi:10.1007/s10853-008-3214-9

Cited by 63 publications

(21 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The nano-metakaolin particles act as nuclei of hydration, possess pozzolanic activity, and can fill the voids in the cement matrix. Also the large surface area of nano-particles and their abundance due to their small size, can facilitate the chemical reactions necessary to produce a dense structure with more calcium silicate hydrates (CSH) and less calcium hydroxide contents [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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

2017

View full text Add to dashboard Cite

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/).

show abstract

Section: Introductionmentioning

confidence: 99%

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

2017

View full text Add to dashboard Cite

show abstract

“…Shebl et al [12] aimed to develop the effect of variable ratio of nano silicate (NS) replacement on the properties of blended white cement pastes as compared with the control paste through the measurements of indirect tensile strength (ITS). It was found that, increasing the replacement content of unactivated NS up to 2%, improved the ITS by about 40% compared with the control paste.…”

Section: Introductionmentioning

confidence: 99%

Influence of nano materials on flexural behavior and compressive strength of concrete

Mohamed

2016

HBRC Journal

102

View full text Add to dashboard Cite

This paper investigates the effect of nano particles on the mechanical properties at different ages of concrete. Different mixtures have been studied including nano-silica (NS), nano-clay (NC) or both NS and NC together with different percentages. Mechanical properties have been investigated such as compressive and flexure strength through testing concrete prisms 40, 40 and 160 mm at 7, 28 and 90 days in order to explore the influence of these nano particles on the mechanical properties of concrete. Results of this study showed that nano particles can be very effective in improving mechanical properties of concrete, nano-silica is more effective than nano clay in mechanical properties and wet mix gives higher efficiency than dry mix. Exceeding a certain percentage of nano particles in concrete negatively affects the mechanical properties. Also, binary usage of nano particles; (NS + NC) had a remarkable improvement appearing in concrete compressive strength than using the same percentage of single type of nano particles. This improvement can be attributed to the reaction of nano materials with calcium hydroxide Ca(OH) 2 crystals, which are arrayed in the interfacial zone (ITZ) between hardened cement paste and aggregates, and produce C-S-H gel and the filling action of nano particles which cause more densified microstructure. A percent of 3% nano particles consisting of 25% NS and 75% NC gave the highest mechanical properties representing in both compressive and flexure strengths among other percentages. ª 2014 Production and hosting by Elsevier B.V. on behalf of Housing and Building National Research Center.

show abstract

“…In recent years, nano-sized particles are widely studied for their application in cement-based materials in terms of eventually improved material properties, e.g., mechanical performance [9][10][11], permeability [9,12,13], and microstructure of the matrix [12,14]. The incorporated nanoparticles are mainly inorganic materials, e.g., nano-TiO 2 [15], nano-SiO 2 [13,16], and/or nano-Fe 2 O 3 [14].…”

Section: Introductionmentioning

confidence: 99%

Corrosion performance of reinforced mortar in the presence of polymeric nano-aggregates: electrochemical behavior, surface analysis, and properties of the steel/cement paste interface

Koleva

Breugel

2012

J Mater Sci

View full text Add to dashboard Cite

This study reports on the effect of admixed polyethylene oxide-b-polystyrene (PEO 113 -b-PS 70 ) micelles on corrosion behavior of reinforced mortar. The electrochemical measurement shows that the corrosion performance of the reinforcing steel was not significantly improved. However, surface analysis and microstructural investigation at the steel/cement paste interface reveal that the admixed micelles lead to a steel surface layer with enhanced barrier properties in terms of morphology and composition. Therefore, the presence of micelles further minimized and halted the corrosion process, despite the very aggressive, chloride-containing environment of 5% NaCl. The reasons and mechanisms behind the hereby observed corrosion behavior of reinforced mortar in the presence of micelles are related to the influence of these nano-aggregates on microstructural properties. These further results in altered water/ion transport and chloride-binding mechanisms in the bulk mortar matrix and thus steel product layer modifications towards enhanced corrosion resistance.

show abstract

Mechanical behavior of activated nano silicate filled cement binders

Cited by 63 publications

References 20 publications

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

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

Influence of nano materials on flexural behavior and compressive strength of concrete

Corrosion performance of reinforced mortar in the presence of polymeric nano-aggregates: electrochemical behavior, surface analysis, and properties of the steel/cement paste interface

Contact Info

Product

Resources

About