Barbara Lothenbach

About
Privacy
Disclaimer

Graph Chatbot

Related publications (31)

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

Fe-containing phases in hydrated cements

Karen Scrivener, Belay Zeleke Dilnesa, Barbara Lothenbach

In this study synchrotron X-ray absorption spectroscopy (XAS) has been applied, an element specific technique which allows Fe-containing phases to be identified in the complex mineral mixture of hydrated cements. Several Fe species contributed to the overa ...

Pergamon-Elsevier Science Ltd2014

On the relevance of volume increase for the length changes of mortar bars in sulfate solutions

Karen Scrivener, Wolfgang Kunther, Barbara Lothenbach

The ingress of sulfate ions into cementitious materials leads to the formation of ettringite, gypsum and other phases. The increase in solid volume through the formation of these phases is often assumed to be the only reason for expansion. In this paper we ...

Pergamon-Elsevier Science Ltd2013

Influence of bicarbonate ions on the deterioration of mortar bars in sulfate solutions

Karen Scrivener, Wolfgang Kunther, Barbara Lothenbach

This work investigates the influence of bicarbonate ions on the deterioration of cementitious material exposed to sulfate ions. Mortars based on a CEM I and on a CEM III/B cement were investigated. Experimental investigations were compared to thermodynamic ...

Pergamon-Elsevier Science Ltd2013

Deterioration of mortar bars immersed in magnesium containing sulfate solutions

Karen Scrivener, Wolfgang Kunther, Barbara Lothenbach

Mortars prepared with a CEM I and a CEM III/B binder were investigated in different magnesium sulfate solutions. The main deterioration mechanism for the CEM I was expansion, while surface erosion was dominant for CEM III/B. The presence of sodium, potassi ...

Springer Verlag2013

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

Supplementary cementitious materials

Karen Scrivener, Barbara Lothenbach

The use of silica rich SCMs influences the amount and kind of hydrates formed and thus the volume, the porosity and finally the durability of these materials. At the levels of substitution normally used, major changes are the lower Ca/Si ratio in the C-S-H ...

Pergamon-Elsevier Science Ltd2011

Impact of chloride on the mineralogy of hydrated Portland cement systems

Barbara Lothenbach

Chloride ion is in part bound into ordinary Portland cement paste and modifies its mineralogy. To understand this a literature review of its impacts has been made and new experimental data were obtained. Phase pure preparations of Friedel's salt, Ca4Al2(Cl ...

Pergamon-Elsevier Science Ltd2010

Physical and microstructural aspects of sulfate attack on ordinary and limestone blended Portland cements

Karen Scrivener, Barbara Lothenbach

The consequences of external sulfate attack were investigated by traditional test methods, i.e. length and mass change, as well as by a newly developed, surface sensitive ultrasonic method, using Leaky Rayleigh waves (1 MHz). The macroscopic changes are di ...

Pergamon-Elsevier Science Ltd2009

Influence of limestone on the hydration of Portland cements

Karen Scrivener, Emmanuel Gallucci, Barbara Lothenbach

The influence of the presence of limestone on the hydration of Portland cement was investigated. Blending of Portland cement with limestone was found to influence the hydrate assemblage of the hydrated cement. Thermodynamic calculations as well as experime ...

Pergamon-Elsevier Science Ltd2008

A thermodynamic and experimental study of the conditions of thaumasite formation

Karen Scrivener, Thomas Schmidt, Barbara Lothenbach

The formation of thaumasite was investigated with the progressive equilibrium approach (PEA). This approach experimentally simulates the conditions of various levels of sulfate addition in hardened cement pastes. The influence of limestone, time, C(3)A con ...

Pergamon-Elsevier Science Ltd2008

Page 2 of 2