000002361 001__ 2361
000002361 005__ 20141118153435.0
000002361 04107 $$acze
000002361 046__ $$k2013-09-11
000002361 100__ $$aPavia, S.
000002361 24500 $$aPortland cement-lime mortars for conservation

000002361 24630 $$n3.$$pProceedings of the 3rd Historic Mortars Conference HMC13
000002361 260__ $$bGlasgow : University of the West of Scotland, 2013
000002361 506__ $$arestricted
000002361 520__ $$2eng$$aIt is currently widely accepted that lime, rather than Portland cement (PC), should be used for the repair of historic fabrics as most historic mortars were lime based and properties of PC mortar such as strength, stiffness and permeability can be incompatible with historic stone and brick, with consequent damage to fabrics. As a result, PC mortars are no longer used in conservation. However, lime addition significantly alters the properties of PC mortars. This paper investigates the variation of PC mortar properties with increasing hydrated lime addition (CL90s), and compares the results with typical values of natural hydraulic lime (NHL) mortars often used in conservation. The results evidence that PC/lime mortars display good workability with a high water retention, low air content and a reliable bond. Their properties are comparable to those of NHL mortars therefore, they are probably compatible with certain historic fabrics. The air content of the PC/lime mortars is low, similar to the typical air content of NHL mortars. Their water retention is high, significantly superior to those of equivalent PC mortars and comparable to typical NHL mortar values. The compresive and flexural strength and elastic modulus of the lower-limecontent mortars (1/0.25/6 and 1/1/6-PC/lime/sand) are superior to the values typically reached by NHL mortars however, their bond strength is similar. The strength, elastic modulus and bond of the PC/lime mortar with higher lime content (1/2/6) are comparable to the values typically reached by NHL2 mortars. Low lime contents produced stronger, stiffer mortars with greater bond, increased flexibility and water retention and lower air content than PC alone.

000002361 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000002361 653__ $$aPC/lime mortars; bond-stength; air-content; water-retention; strength/stiffness.

000002361 7112_ $$a3rd Historic Mortars Conference$$cGlasgow, Scotland (UK)$$d2013-09-11 / 2013-09-14$$gHMC13
000002361 720__ $$aPavia, S.$$iBrennan, O.
000002361 8560_ $$ffischerc@itam.cas.cz
000002361 8564_ $$s529890$$uhttp://invenio.itam.cas.cz/record/2361/files/Pavia - Portland cement-lime mortars for conservation.pdf$$y
             Original version of the author's contribution as presented on CD, .
            
000002361 962__ $$r2223
000002361 980__ $$aPAPER