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Karen Scrivener

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Publications associées (271)

Methods for determination of degree of reaction of slag in blended cement pastes

Karen Scrivener, Emmanuel Gallucci, Vanessa Kocaba

To measure the degree of reaction of slag in blended pastes, five methods were studied. Selective dissolution and differential scanning calorimetry are shown to be unreliable, SEM-BSE-IA-mapping is time consuming, but does provide good results with a reaso ...

Pergamon-Elsevier Science Ltd2012

Straight talk with Karen Scrivener on cements, CO2 and sustainable development

Karen Scrivener

2012

The influence of sodium and potassium hydroxide on volume changes in cementitious materials

Karen Scrivener, Aditya Kumar

This research investigates the influence of alkali hydroxides on unrestrained volume changes. A detailed multi-method approach is used to characterize the progress of cement hydration, autogenous and drying volume changes (i.e., shrinkage), autogenous RH d ...

Pergamon-Elsevier Science Ltd2012

Effects of uniaxial stress on alkali-silica reaction induced expansion of concrete

Cyrille Dunant, Karen Scrivener

ASR affected concrete in real structures is usually subject to loads which affect the macroscopic expansion of the material. An experimental study was undertaken using sensors embedded in reactive and non-reactive samples loaded on modified creep frames. N ...

Pergamon-Elsevier Science Ltd2012

Effect of mixing on the early hydration of alite and OPC systems

Patrick Juilland, Karen Scrivener, Emmanuel Gallucci, Aditya Kumar

The kinetics of hydration of cementitious materials is sensitive to the mixing procedure. High shear mixing conditions lead to an increase in the kinetics of hydration at early age compared to low shearing conditions such as hand mixing. In this study the ...

Pergamon-Elsevier Science Ltd2012

Effect of recycled cellulose fibres on the properties of lightweight cement composite matrix

Amor Guidoum, Karen Scrivener, Mohamed Bentchikou

This paper discusses the results from an experimental investigation conducted to study the effect on using cellulose fibres as cement replacement on the properties of lightweight cement composite. The fibres were recycled from waste paper and packaging and ...

2012

The influence of aluminium on the dissolution of amorphous silica and its relation to alkali silica reaction

Karen Scrivener, Theodor Alexandre Emmanuele Chappex

It is known that the addition of supplementary cementitious materials (SCMs) in concretes reduces or even stops expansion due to alkali silica reaction (ASR). It has been widely shown that the main mechanism controlling ASR in blends is the alkali fixation ...

Pergamon-Elsevier Science Ltd2012

Effects of aggregate size on alkali-silica-reaction induced expansion

Cyrille Dunant, Karen Scrivener

The macroscopic effects of ASR are linked to the damage state at the microstructure level. In this paper we used a combination of experiments and modelling to study the effect of aggregate size on the manifestation of ASR. There are two main ways in which ...

Pergamon-Elsevier Science Ltd2012

Alkali fixation of C-S-H in blended cement pastes and its relation to alkali silica reaction

Karen Scrivener, Theodor Alexandre Emmanuele Chappex

Supplementary cementitious materials (SCM) are known to reduce or even stop expansion due to alkali silica reaction (ASR) in concretes with reactive aggregates. Studies indicate that the main reason for this is the decrease in alkalinity of the pore soluti ...

Pergamon-Elsevier Science Ltd2012

The influence of sodium and potassium hydroxide on alite hydration: Experiments and simulations

Karen Scrivener, Caterina Gianocca, Aditya Kumar

The basic nature of alkali hydroxides (NaOH, KOH) when added to mixing water, increases the pH in proportion to the level of salt addition. For alite (impure tricalcium silicate; MIII-Ca3SiO5) hydration, this pH increase accelerates the rate of hydration a ...

Pergamon-Elsevier Science Ltd2012

Modelling early age hydration kinetics of alite

Karen Scrivener, Shashank Bishnoi, Aditya Kumar

The modelling platform mu ic [1] has been used to investigate the mechanisms occurring during the hydration of alite. It is shown that it is possible to obtain a good simulation of the hydration kinetics through the implementation of two mechanisms: a diss ...

Pergamon-Elsevier Science Ltd2012

Cement substitution by a combination of metakaolin and limestone

Mathieu Antoni, Karen Scrivener, John Espen Rossen

This study investigates the coupled substitution of metakaolin and limestone in Portland cement (PC). The mechanical properties were studied in mortars and the microstructural development in pastes by X-ray diffraction, thermogravimetry analysis, mercury i ...

Pergamon-Elsevier Science Ltd2012

Discussion of the paper "Accelerated growth of calcium silicate hydrates" by Luc Nicoleau

Karen Scrivener, Shashank Bishnoi

Some of the limitations of the model recently used by Nicoleau in a recent article [Accelerated growth of calcium silicate hydrates: experiments and simulations, Cement Concr. Res. 21 (2011) 1339 - 1348.] are discussed. (C) 2012 Elsevier Ltd. All rights re ...

Pergamon-Elsevier Science Ltd2012

The origin of early age expansions induced in cementitious materials containing shrinkage reducing admixtures

Patrick Juilland, Karen Scrivener, Barbara Lothenbach

Studies on the early-age shrinkage behavior of cement pastes, mortars, and concretes containing shrinkage reducing admixtures (SRAs) have indicated these mixtures frequently exhibit an expansion shortly after setting. While the magnitude of the expansion h ...

Pergamon-Elsevier Science Ltd2011

Modelling hydration kinetics of multi-phase cementitous systems

Karen Scrivener, Ajay Kumar

2011

An algorithm to compute damage from load in composites

Cyrille Dunant, Karen Scrivener

2011

Hydration of cementitious materials, present and future

Karen Scrivener

This paper is a keynote presentation from the 13th International Congress on the Chemistry of Cement. It discusses the underlying principles of hydration and recent evidence for the mechanisms governing this process in both Portland cements and other cemen ...

Pergamon-Elsevier Science Ltd2011

Reply to the discussion by J. Makar, J.J. Beaudoin, T. Sato, R. Alizadeh and L. Raki of "dissolution theory applied to the induction period in alite hydration"

Patrick Juilland, Karen Scrivener, Emmanuel Gallucci

Pergamon-Elsevier Science Ltd2011

Application of the Rietveld method to the analysis of anhydrous cement

Karen Scrivener, Vanessa Kocaba

X-ray powder diffraction allows direct measurement of the phase content in cement. More recently, whole pattern approaches such as the Rietveld method show an improvement in both within (repeatability) and between laboratory (reproducibility) precision. Th ...

Pergamon-Elsevier Science Ltd2011

The origin of the pozzolanic activity of calcined clay minerals: A comparison between kaolinite, illite and montmorillonite

Rodrigo Fernandez Lopez, Karen Scrivener

This paper investigates the decomposition of three clayey structures (kaolinite, illite and montmorillonite) when thermally treated at 600 degrees C and 800 degrees C and the effect of this treatment on their pozzolanic activity in cementitious materials. ...

Pergamon-Elsevier Science Ltd2011

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