000002369 001__ 2369
000002369 005__ 20141118153435.0
000002369 04107 $$acze
000002369 046__ $$k2013-09-11
000002369 100__ $$aStamatakis, M. G.
000002369 24500 $$aThe production of cementitious compounds using calcareous diatomite raw materials and possible industrial uses

000002369 24630 $$n3.$$pProceedings of the 3rd Historic Mortars Conference HMC13
000002369 260__ $$bGlasgow : University of the West of Scotland, 2013
000002369 506__ $$arestricted
000002369 520__ $$2eng$$aThe present study deals with the use of calcareous diatomites, a naturally occurring amorphous silica- and calcite-rich raw material, for the production of C2S-rich clinker that will be used in mortars. The aim of the study is to lower the burning temperature from 1400-1500°C required for the production of the ordinary clinker, to 1000-1100°C, and hence to save energy. However, the resulted calcium silicate endproduct is expected to have lower compressive strength, because of the absence of other synthetic mineral phases such as C3S and C3A that contribute, besides early, to the development of late compressive strength. The selected diatomites were of different origin and came from the Greek islands of Zakynthos, Samos and Milos. Zakynthos diatomite is solely composed of biogenic silica [opal-A] and microcrystalline and biogenic calcite, whereas the other two deposits of Samos and Milos additionally contain minor amounts of smectite and volcanic glass respectively. Furthermore, two commercial calcareous diatomite samples from France were also examined for comparison purposes. XRD, SEM and XRF analysis were implemented for the characterization of the raw materials and end-products. In the range of 1000-1100°C, all ground bulk samples yielded larnite [C2S] followed by significant amounts of silica polymorphs such as quartz, tridymite, cristobalite, and wollastonite. To improve the efficiency of the raw materials to form C2S, different amounts of ground calcite were added to three diatomites, forming diatomite/added calcite mix in ranging ratios. It was found that in some mixtures lime and/or portlandite were also formed, besides the calcium silicates. The larnite-rich final product exhibits some compressive strength that under certain prerequisites could approach that of ordinary cement at later ages.

000002369 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000002369 653__ $$adiatomite, wollastonite, larnite, belite, opal-A

000002369 7112_ $$a3rd Historic Mortars Conference$$cGlasgow, Scotland (UK)$$d2013-09-11 / 2013-09-14$$gHMC13
000002369 720__ $$aStamatakis, M. G.$$iKartanou, D.$$iFragoulis, D.
000002369 8560_ $$ffischerc@itam.cas.cz
000002369 8564_ $$s310888$$uhttp://invenio.itam.cas.cz/record/2369/files/Stamatakis - The production of cementitious compounds using calcareous diatomite raw materials and possible industrial uses.pdf$$y
             Original version of the author's contribution as presented on CD, .
            
000002369 962__ $$r2223
000002369 980__ $$aPAPER