External sulfate attack (ESA) of cementitious materials has been studied worldwide for a very long time. This physical/chemical interaction between sulfate ions and the cement hardened elements affects the long-term durability of concrete structures: cracking, spalling or strength loss of concrete structures. To study these damaging phenomena, some...
Les bétons de chanvre sont des matériaux d'isolation biosourcés dont l'utilisation est en plein essor en France. Cependant, leur développement est encore limité par le manque de recul sur leurs performances, notamment en ce qui concerne leurs propriétés mécaniques. La variabilité des caractéristiques des granulats végétaux est à l'origine de ce rés...
The addition of water is used to past by internal post-curing of hardening cement. Hydration and curing of cementitious are widely identified by non-destructive 1H nuclear magnetic resonance (NMR) measurements of transverse relaxation time and self-diffusion. However, those non-destructive analytical methodologies do not give a truly chemical chara...
This study deals with the definition of an efficient combination of fly ash (FA) with lime or cement and with both, to improve the dredged sediment (DS) properties. At early age, filler and nucleation effects of FA lead to a refinement of the microstructure in addition to the macro porosity reduction induced by lime and cement. At long term, the mi...
The biodeterioration of cementitious materials in sewer networks has become a major economic, ecological, and public health issue. Establishing a suitable standardized test is essential if sustainable construction materials are to be developed and qualified for sewerage environments. Since purely chemical tests are proven to not be representative o...
Swelling clays characterized by their shrinkage and swelling phenomenon are known to be the main cause of cracking of paved roads. So, the road construction on swelling soils require knowledge and specific techniques, including the chemical stabilisation with lime or cement addition. This technique favors the sustainable developement by avoiding wa...
Published in Matériaux & Techniques
Polymer-modified mortars are cementitious materials that integrate polymers from 5 to 20 wt.%. Those materials are widely used for protecting and/or repairing concrete surfaces among which building facades, civil engineering structures, or sewage networks. In this context, polymer-modified mortars are applied into thin layers of about 1–3 cm. Howev...
International audience
Civil engineering structures exposed to external sulphate are widely encountered in the world. Usual laboratory experiments used to characterize sulphate attack require long periods of time (e.g., for months). We have adapted a test already available in the literature: ground compacted materials placed in an oedometric cell are flushed with a sodiu...
