caa a22 4500 463224671 CHVBK 20180405153223.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-1239-5 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1239-5 Multi-technique and multi-scale approach applied to study the structural behavior of heterogeneous materials: natural SiO2 case [Elektronische Daten] [L. Khouchaf, J. Verstraete] A multi-technique and multi-scale approach have been initiated to study the structural properties of a natural heterogeneous material. This approach has led us to introduce the concepts of long-range order LRO and short-range order SRO. The correlation between these concepts has enabled us to advance in the comprehension of the mechanisms of degradation of natural SiO2 aggregate submitted to the process of the alkali-silica reaction (ASR). On LRO scale, the structural changes of the aggregate are revealed by the reduction of the size of grains, which means that the attack starts by affecting amorphous and poorly crystallized zones. This phenomenon generates the formation of very unstable amorphous and nanocrystallized products, which take part in the degradation of the aggregate. On SRO scale tetrahedral environment of silicon atoms is preserved in spite of the introduction of OH- ions with a relaxation phenomenon. The second layer of coordination around silicon remains almost unchanged. These results add new information showing that ASR must be considered as a multi-scale process. The methodology itself may be extended to other problems. Springer Science+Business Media, LLC, 2006 Khouchaf L. Centre de Recherche de l'Ecole des Mines de Douai, 941, rue Charles Bourseul, BP.838, 59508, Douai, France aut Verstraete J. Centre de Recherche de l'Ecole des Mines de Douai, 941, rue Charles Bourseul, BP.838, 59508, Douai, France aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2455-2462 0022-2461 42:7<2455 2007 42 10853 https://doi.org/10.1007/s10853-006-1239-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1239-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khouchaf L. Centre de Recherche de l'Ecole des Mines de Douai, 941, rue Charles Bourseul, BP.838, 59508, Douai, France aut NATIONALLICENCE 700 1- Verstraete J. Centre de Recherche de l'Ecole des Mines de Douai, 941, rue Charles Bourseul, BP.838, 59508, Douai, France aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2455-2462 0022-2461 42:7<2455 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer