000003019 001__ 3019
000003019 005__ 20141118153411.0
000003019 04107 $$acze
000003019 046__ $$k2010-09-22
000003019 100__ $$aHughes, D.C.
000003019 24500 $$aRoman cement for the production of conservation mortars

000003019 24630 $$n2.$$pHistoric Mortars and RILEM TC 203-RHM Final Workshop
000003019 260__ $$bRILEM Publications s.a.r.l., 157 rue des Blains F-92220 Bagneux - France
000003019 506__ $$arestricted
000003019 520__ $$2eng$$aRoman cement was patented in 1796 and used extensively throughout European architecture of the 19th and early 20th centuries before the domination of Portland cement and new architectural styles became established. It was characterised by a brown colour and a fast setting time, typically ~15 minutes. However, conservation of this architecture has received little attention and the former rich palette of cements is no longer available. Companion studies of historic mortars and the laboratory calcination of various raw materials have been undertaken. The historic mortars have been found to be both richer in cement than many modern mortars and generally utilised fine sands. Optimal cements have been produced at low temperatures, typically 750°C, and characteristic microstructural features of sub-optimal, optimal and super-optimal calcinations are described. Observation of these within the historic mortars indicates that the control of kiln temperatures was poor. Additionally, grinding of the historic cements did not always yield the grain sizes contained within contemporary specifications. The criteria for the production of Roman cements have been successfully re-established.

000003019 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000003019 653__ $$a

000003019 7112_ $$a2nd Conference and of the Final Workshop of RILEM TC 203-RHM$$cPrague (CZ)$$d2010-09-22 / 2010-09-24$$gHMC2010
000003019 720__ $$aHughes, D.C.$$iKozlowski, R.$$iWeber, J.
000003019 8560_ $$ffischerc@itam.cas.cz
000003019 8564_ $$s445527$$uhttps://invenio.itam.cas.cz/record/3019/files/page_1043.pdf$$y
             Original version of the author's contribution as presented on CD, , page 1043.
            
000003019 962__ $$r2907
000003019 980__ $$aPAPER