Hydration and microstructures of concrete containing raw or densified silica fume at different curing temperatures

Zhang, Zengqi; Zhang, Bo; Yan, Peiyu

doi:10.1016/j.conbuildmat.2016.06.014

Cited by 112 publications

(31 citation statements)

References 31 publications

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“…With the incorporation of the SF to Portland cement, a slight decrease of the total porosity was detected (Zhang et al 2016, Alonso-Rodriguez et al 2017, while an increase of porosity was observed with the incorporation of the MK (Frías, 2006). In general, the differences are very small and can be considered very similar to the reference paste.…”

Section: Mipmentioning

confidence: 96%

Effect of Partial Substitution of Highly Reactive Mineral Additions by Nanosilica in Cement Pastes

Rêgo

Frías

Moragues

et al. 2019

J. Mater. Civ. Eng.

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The phenomena involved in portland cement hydration and interactions with nanosilica are very complex and not yet fully understood. In addition, few papers have currently proposed to investigate the microstructure and mechanical properties of ternary mixtures using portland cement, colloidal nanosilica, and highly reactive mineral additions. This article investigates, for the first time, the behavior of different highly reactive mineral additions (silica fume and metakaolin) when partially replaced by colloidal nanosilica in the microstructure and hydration of cementitious materials. For the study of the cementitious material microstructures, a Langavant calorimeter, compressive strength, Xray diffraction, thermogravimetry, infrared spectroscopy, and mercury intrusion porosimetry were used. The pastes with a 1% substitution of highly reactive mineral additions by nanosilica showed higher compressive strength and more refined porosity than the pastes with only silica fume or metakaolin. The results show that nanosilica appears to have better synergism with metakaolin than with silica fume.

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Section: Mipmentioning

confidence: 96%

Effect of Partial Substitution of Highly Reactive Mineral Additions by Nanosilica in Cement Pastes

Rêgo

Frías

Moragues

et al. 2019

J. Mater. Civ. Eng.

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“…Ref [5] explains that mechanical properties, complete replacement of coarse aggregate would be possible when recycled coarse aggregates were produced from unique concrete with a least strength. [2], [6] clarifies the inclusion of SF can decrease the content of Calcium Hydroxide (CH) due to its pozzolanic response. [13] illustrates that denser formation of CSH gel will influence the structural strength of concrete In general, this research paper focuses on assessing the relationship between the structural and microstructural behavior of HPC and to attain sustainability through partial replacement of concrete ingredients with recycled waste material or cost-effective materials.…”

Section: Introductionmentioning

confidence: 97%

Strength and Microstructure of Sustainable High Performance Concrete

Saran*¹,

Harish.²

2019

IJRTE

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Concrete has an amalgamated microstructure which would be very difficult to study its microstructure due to high level of heterogeneity This research intends to produce a Sustainable High performance concrete (SHPC) by replacing conventional concrete materials with sustainable materials. The vital elements of concrete were replaced with sustainable materials which has the ability to improve the mechanical property of concrete and to make the concrete sustainable. Cement was partially substituted with Fly ash (30% and 35%) and Silica fume (7.5 % and 10%) and fine aggregate was wholly substituted with manufactured sand. Coarse aggregate was partially replaced with recycled aggregate taken from the Construction Demolished Waste (CDW) (30% and 40%).Five trial mixes were prepared and casted into cubes. Compressive strength and quantitative analysis of concrete by using XRD Analysis were studied and the obtained results were interrelated with each other based on their composition of minerals elements and strength of SHPC. The comparative study showed a promising result on the SHPC 3 in which the sustainable materials binds to produce a well-built C-S-H gel. The influence of the sustainable materials at optimal range could help to accomplish sustainability in High Performance Concrete.

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“…Nowadays, an increasing amount of supplementary cementitious materials (SCMs) have been used in the preparation of cement concrete, eg, fly ash, 2-6 steel slag, [7][8][9][10][11] silica fume, 4,[12][13][14][15] and ground granulated blast furnace slag (GGBS). 13,[16][17][18][19] In addition to the chemical reaction, these mineral admixtures also have some impacts on the early hydration of cement due to their physical presence which is generally named as filler effect.…”

Section: Introductionmentioning

confidence: 99%

A new hydration kinetics model of composite cementitious materials, Part 2: Physical effect of SCMs

et al. 2020

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This paper is the second part of an overall research project that aims to model the hydration kinetics of composite cementitious materials. The new hydration kinetic model of Portland cement was constructed in the first part of this research project. The aim of this part is to characterize the physical effect of SCMs by modifying some kinetic parameters of the hydration kinetic model of cement. In this paper, the filler effect of SCMs is attributed to the “dilution effect”, “nucleation effect” and “accelerated dissolution effect”. The dilution effect is considered by introducing the actual water/cement ratio into the kinetic model. The nucleation surface area, nucleation and growth rates are modified to account for the nucleation effect and accelerated dissolution effect of fillers. The simulative fit results show that the extra contribution of SCMs due to their filler effect on hydration of cement at early ages has an upper limit: at most 20% extra nucleation surface area, 30% extra nucleation ratio and 40% extra growth ratio of calcium silicate hydrate (CSH). The new modified kinetic model and the value‐taking method of the newly introduced parameters are verified by simulative fitting to the kinetic data from reference. The apparent activation energies of the nucleation rate, growth rate, and diffusion rate are approximately 35 kJ/mol, 36 kJ/mol and 38.5 kJ/mol, which are slightly smaller than those of the pure Portland cement reported in the first part of this research project.

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Hydration and microstructures of concrete containing raw or densified silica fume at different curing temperatures

Cited by 112 publications

References 31 publications

Effect of Partial Substitution of Highly Reactive Mineral Additions by Nanosilica in Cement Pastes

Effect of Partial Substitution of Highly Reactive Mineral Additions by Nanosilica in Cement Pastes

Strength and Microstructure of Sustainable High Performance Concrete

A new hydration kinetics model of composite cementitious materials, Part 2: Physical effect of SCMs

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