000002915 001__ 2915
000002915 005__ 20141118153415.0
000002915 04107 $$acze
000002915 046__ $$k2010-09-22
000002915 100__ $$aBourgès, A.
000002915 24500 $$aFamous men busts decorating a Parisian facade: Characterization and decay process of a cast artificial stone from the XIXth century

000002915 24630 $$n2.$$pHistoric Mortars and RILEM TC 203-RHM Final Workshop
000002915 260__ $$bRILEM Publications s.a.r.l., 157 rue des Blains F-92220 Bagneux - France
000002915 506__ $$arestricted
000002915 520__ $$2eng$$aAfter cleaning, four 19th century cast busts of illustrious men decorating a Parisian façade revealed severe deterioration. A network of large cracks 0.5 cm wide gave the appearance of a broken up puzzle, although each individual piece maintained good general cohesion. In order to determine the cause of the intense decay and to propose an adequate conservation protocol, the composition of this artificial stone was thoroughly investigated. Sample analyses showed that the material was composed mainly of crushed and probably sieved limestone aggregate bonded with hydrocerussite and an amorphous silica gel containing a small amount of potassium. The binder surrounded and linked calcite aggregates together. Analytical results were consistent with artificial stone recipes from the 19th century. In this paper, we report the results of analyses performed on those strange objects. We also will discuss two hypotheses of composition based on potassium silicate and propose an explanation for the peculiar degradation patterns.

000002915 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000002915 653__ $$a

000002915 7112_ $$a2nd Conference and of the Final Workshop of RILEM TC 203-RHM$$cPrague (CZ)$$d2010-09-22 / 2010-09-24$$gHMC2010
000002915 720__ $$aBourgès, A.$$iVergès-Belmin, V.$$iCord, S.
000002915 8560_ $$ffischerc@itam.cas.cz
000002915 8564_ $$s401555$$uhttps://invenio.itam.cas.cz/record/2915/files/page_0065.pdf$$y
             Original version of the author's contribution as presented on CD, , page 65.
            
000002915 962__ $$r2907
000002915 980__ $$aPAPER