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Unidirectional penetration approach for characterizing sulfate attack mechanisms on cement mortars and pastes

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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 ...

Elsevier2008

The sulfate attack is known to influence the durability of concrete. In general, significant damage due to sulfate interaction results in the structural breakdown of the concrete structure. However, the precipitation of thaumasite due to sulfate concentrat ...

EPFL2007

Placing concrete requires much more water than the cement needs for its hydration. This results in an important porosity in the hardened concrete, which accentuates the degradation of this material. By adding small amounts of polymeric admixtures, called s ...

EPFL2004

Effects of an early or a late heat treatment on the microstructure and composition of inner C-S-H products of Portland cement mortars

Karen Scrivener

The influence of both early and late heat treatments on the microstructure and on the hydration products of Portland cement mortars has been investigated. The mortars were given either a 4-h or 28-day precure at 20 °C before heating at 90 °C for 12 h and w ...

2002

The Chemical and Physiological Size of Fluorine

The effect of fluorine as a substituent on reactions and biol. activity of natural products was reviewed with 324 refs. ...

Wiley1999

Heat curing and delayed ettringite formation

Karen Scrivener

This paper reports some preliminary results from a study of the effect of elevated temperature curing on mortars and the phenomenon of delayed ettringite formation (DEF). Mortars made from cements with sulphate levels of 3%, 4%, and 5% and with 5% sulphate ...

1995

Diffusion de gaz, carbonatation et retrait de la pâte de ciment durcie

Though the carbonation of cementitious materials has been widely studied, numerous problems remain unsolved. The lack of quantitative data especially appears when one tries to model the carbonation process with the aim of predicting the lifetime of a reinf ...

EPFL1993

Propriétés physico-chimiques et ostéogéniques d'un biociment hydraulique à base de phosphates de calcium

Biocements made from β-TCP - H3PO4 - H2O and β-TCP - MCPM - H2O mixtures were studied in order to obtain a better control of their setting time and mechanical strength (β-TCP = Ca3(PO4)2; MCPM = Ca(H2PO4)2.H2O). The effects of factors like the purity of th ...

EPFL1993