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Karen Scrivener

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Related publications (271)

Effect of cement substitution by limestone on the hydration and microstructural development of ultra-high performance concrete (UHPC)

Karen Scrivener, Mohammadhadi Kazemi Kamyab, Wei Sun, Wei Huang

The effect of limestone on the hydration and microstructural development of ultra high performance concrete (UHPC) with different levels of replacement (34%, 54% and 74% by volume) was investigated. Up to 54% replacement of cement by limestone the mixes sh ...

Elsevier2017

Phase assemblage of composite cements

Mohsen Ben Haha, Karen Scrivener, Pawel Tadeusz Durdzinski

The phase assemblage of binary Portland cements with 45 wt% replacement by calcareous fly ash and slag has been investigated by experiment, mass balance and thermodynamic simulations. The input for these calculations was based on clinker reaction measured ...

Pergamon-Elsevier Science Ltd2017

A reassessment of mercury intrusion porosimetry by comparison with H-1 NMR relaxometry

Karen Scrivener, Arnaud Charles Albert Muller

This paper shows how MIP measurements can give an accurate picture of the capillary porosity of cement pastes. Regions of the intrusion curves can be identified corresponding to capillary or gel pores. The amount of capillary pores is in excellent agreemen ...

Pergamon-Elsevier Science Ltd2017

Corrugated tube protocol for autogenous shrinkage measurements: review and statistical assessment

Karen Scrivener, Pietro Lura, Zhangli Hu

Among different methods of measuring early age autogenous deformation of cementitious materials, the corrugated tube method described in the ASTMC1698-09 standard is one of the most commonly used. Despite the standardization and the common application of t ...

Springer2017

Optimization of SEM-EDS to determine the C-A-S-H composition in matured cement paste samples

Karen Scrivener, John Espen Rossen

Microanalysis of characteristic X-rays in the SEM is a powerful method to assess the chemical composition of phases in cement pastes, in particular the calcium silicate hydrate containing aluminium (C-A-S-H). Nevertheless, many variables may influence the ...

Elsevier Science Inc2017

Modified poly(carboxylate ether)-based superplasticizer for enhanced flowability of calcined clay-limestone-gypsum blended Portland cement

Karen Scrivener, Aurélie Rosine Favier, Amin Hodaei, Tunahan Aytas, Buse Tatli

Supplementary materials that are utilized to replace ordinary Portland cement (OPC) decrease the workability of the cementitious mixtures and superplasticizers are usually added to cement to control their fluidity. In general, current superplasticizers are ...

Pergamon-Elsevier Science Ltd2017

Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)

Karen Scrivener, Barbara Lothenbach, Émilie Michèle L'Hôpital

Uptake of the alkalis K and Na by calcium silicate hydrate (C-S-H) and calcium alumina silicate hydrate (C-A-S-H) of molar Ca/Si ratios = 0.6 to 1.6 and molar Al/Si ratio = 0 or 0.05 has been studied at 20 degrees C. Alkalis are thought to be bound in the ...

Pergamon-Elsevier Science Ltd2016

Impact of water activity on the stability of ettringite

Karen Scrivener, Thomas Matschei

The stability of ettringite as function of temperature and water vapour pressure was studied on synthetic samples using X-ray diffraction, thermogravimetric analysis, sorption balance measurements and different calorimetry techniques. Crystalline ettringit ...

Pergamon-Elsevier Science Ltd2016

Assessment of early age properties of cementitious system through isopropanol-water replacement in the mixing water

Karen Scrivener, Emmanuel Gallucci, Xiao Wang

In this study, a new method to assess early properties of cementitious materials by water-solvent replacement is investigated. Isopropanol was used to replace a part of mixing water of binder paste, limiting the maximum degree of hydration it can achieve. ...

Pergamon-Elsevier Science Ltd2016

Future Cements: Research Needs For Sustainability And Potential Of Lc3 Technolgyscrivener

Karen Scrivener

Due to the enormous volumes produced the production of concrete accounts for around 5-10% of man-made CO2 emissions. Consideration of possible routes to reduce this environmental impact indicates that the use of calcined clays in as supplementary cementiti ...

Int Center Numerical Methods Engineering2016

Development of a new rapid, relevant and reliable (R-3) test method to evaluate the pozzolanic reactivity of calcined kaolinitic clays

Mohsen Ben Haha, Karen Scrivener, François Henri Avet, Adrian Alujas Diaz, Ruben Anton Snellings

The present paper introduces a new rapid, relevant and reliable (R-3) test to predict the pozzolanic activity of calcined clays with kaolinite contents ranging from 0 to 95%. The test is based on the correlation between the chemical reactivity of calcined ...

Pergamon-Elsevier Science Ltd2016

Assessing the environmental and economic potential of Limestone Calcined Clay Cement in Cuba

Karen Scrivener, Aurélie Rosine Favier

Cement is the most produced material around the world. Developing countries face a growth of population involving an increasing need of infrastructures. Due to this situation, the cement industry needs to find the best comprise between increasing the cemen ...

Elsevier Sci Ltd2016

Microstructural Modeling of Early-Age Creep in Hydrating Cement Paste

Karen Scrivener, Shashank Bishnoi

This paper presents a new approach to model the creep behavior of cement paste at early ages. The creep behavior is simulated by applying a time-varying generalized Maxwell model on the individual elements of a finite-element mesh of a simulated three-dime ...

Asce-Amer Soc Civil Engineers2016

Physically based models to study the alkali-silica reaction

Cyrille Dunant, Karen Scrivener

The Laboratory of Construction Materials in Lausanne has been studying the alkali-silica reaction for more than 10 years, advancing the understanding of the reaction, and also producing microstructural models which can be used to predict quantitatively the ...

Ice Publishing2016

Rapid screening tests for supplementary cementitious materials: past and future

Karen Scrivener, Ruben Anton Snellings

Rapid screening tests for supplementary cementitious materials (SCMs) have been in use for over 150 years. Over the years a multitude of methods have been put forward to predict the strength development of SCMblended mortars and concrete. This paper summar ...

Springer2016

Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate

Karen Scrivener, Barbara Lothenbach, Émilie Michèle L'Hôpital

Aluminium uptake in calcium silicate hydrate (C-S-H) was studied at different Ca/Si ratios from 0.6 to 1.6 at 20 degrees C. Aluminium incorporation in C-S-H depends on the total amount of aluminium present in the sample. At low Al/Si ratio (

Pergamon-Elsevier Science Ltd2016

Effect of fineness in clinker-calcined clays-limestone cements

Mathieu Antoni, Karen Scrivener, Adrian Alujas Diaz, Leng Maday Vizcaino Andres

This paper looks at the effect of fineness of the different components in a blend containing 55% Portland cement, 30% calcined clay and 15% limestone. The calcined clay originates from a natural deposit in Cuba and contains less than 50% kaolinite. The par ...

Ice Publishing2015

Degradation mechanism of slag blended mortars immersed in sodium sulfate solution

Karen Scrivener, Cheng Yu, Wei Sun

Additions of slag are usually considered to give cementitious materials which perform well in sulfate bearing environments. This paper compares the deterioration of slag cement blends to those of plain Portland cement and demonstrates that this occurs more ...

Pergamon-Elsevier Science Ltd2015

Composition of C-S-H in pastes with increasing levels of silica fume addition

Karen Scrivener, John Espen Rossen, Barbara Lothenbach

New results show that the microstructure development of cement–silica fume blends is very different from plain cement. Portlandite (CH) tends to precipitate as platelets and even around clinker grains as “CH rims” and is consumed by pozzolanic reaction wit ...

Pergamon-Elsevier Science Ltd2015

Pozzolanic reactivity of low grade kaolinitic clays: Influence of calcination temperature and impact of calcination products on OPC hydration

Rodrigo Fernandez Lopez, Karen Scrivener, Adrian Alujas Diaz

The influence of thermal activation temperature in the pozzolanic reactivity of low grade kaolinitic clay and the impact of calcination products in OPC hydration are assessed in this paper. The raw material, with approximately 40% kaolinite and 40% of 2:1 ...

Elsevier Science Bv2015

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