Aubert J.E.,CNRS Materials and Construction Durability Laboratory |
Segui P.,CNRS Materials and Construction Durability Laboratory |
Husson B.,CNRS Materials and Construction Durability Laboratory |
Measson M.,Eiffage Travaux Publics
Cement and Concrete Composites | Year: 2012
This paper presents an original method developed to quantify the reactivity of mineral additions based on the measurement of the lime (CaO) and gypsum (CaSO 4, 2H 2O) consumed by mineral additions in a paste. Three mineral additions were tested: a Siliceous Filler (SF), a natural pozzolan (Poz) and a Wastepaper Sludge Ash (WSA). The results obtained on SF, considered as a reference, show the efficiency of this method. Its application to Poz and WSA permits the quantity of lime and gypsum consumed by these additions to be evaluated and, thus, the amount of each component to be optimized in Hydraulic Road Binders. © 2012 Elsevier Ltd. All rights reserved.
Segui P.,Toulouse 1 University Capitole |
Aubert J.E.,Toulouse 1 University Capitole |
Husson B.,Toulouse 1 University Capitole |
Measson M.,Eiffage Travaux Publics
Applied Clay Science | Year: 2012
This paper deals with the physical, chemical and mineralogical characterization of WSA in order to evaluate the interest of its potential reuse as a component in hydraulic binders. The results show that WSA contains hydraulic minerals such as lime (CaO), mayenite (Ca 12Al 14O 33) and α'-Ca 2SiO 4 in addition to gehlenite, the main mineral. WSA can also be considered as a hydraulic mineral admixture, which is very encouraging for the potential reuse of this material in hydraulic binders. However, WSA has some characteristics that could be worrying for its reuse. Firstly, SEM observations show that its particles are very porous, and that could lead to problems of workability of cement-based materials containing WSA. Secondly, the presence of both lime and metallic aluminium could be responsible for swelling when WSA is introduced into cement-based materials. No swelling was observed visually during the hydration of WSA-containing paste in this study but this first qualitative test is not sufficient and further investigations of this specific characteristic will be necessary. Finally, the presence of lime in the WSA could be considered as a problem for its use in binder for construction (risk of expansion) but, from another point of view, it would be very interesting for applications in road works, especially for the stabilization of soil, in which lime is regularly employed because it has useful properties (drying and reinforcement of the mechanical strength of the soils). © 2012 Elsevier B.V.
Eiffage Travaux Publics | Date: 2011-03-22
The invention relates to coated material for the base layer of road pavement, made up of aggregate coated with a hydrocarbon binder, wherein the aggregate is more than 95 wt % of the coated material; wherein the aggregate includes a granular structure, which includes a plurality of granular fractions d/D; one intermediate fraction of which is less than 15% of the granules; wherein the hydrocarbon binder is less than 5 wt % of the coated material; wherein the coated material includes, after compacting, a void fraction of less than 8%; wherein the hydrocarbon binder is a hydrocarbon binder modified by adding polymers or oil, or modified by foaming or by emulsion, by means of which the modulus of rigidity of the coated material, once compacted, is higher than 9000 MPa.
Eiffage Travaux Publics and National Graduate School of Chemistry, Rennes | Date: 2010-04-29
The invention relates to surfactant compositions made from esters or amides of the betaine glycine, produced by reaction of the glycine betaine with a sulphonic acid and an alcohol or a fatty-chain amine derived from vegetable oils. The invention further relates to a cosmetic comprising said surfactant composition, in particular, liquid soap, bath foam, shower gel or shampoo.
Eiffage Travaux Publics | Date: 2012-03-20
The present invention relates to a granule comprising: