000002231 001__ 2231
000002231 005__ 20141118153437.0
000002231 04107 $$acze
000002231 046__ $$k2013-09-11
000002231 100__ $$aBorsoi, G.
000002231 24500 $$aChromatic reintegration of historical mortars with lime-based pozzolanic consolidant products

000002231 24630 $$n3.$$pProceedings of the 3rd Historic Mortars Conference HMC13
000002231 260__ $$bGlasgow : University of the West of Scotland, 2013
000002231 506__ $$arestricted
000002231 520__ $$2eng$$aThe consolidation process of old renders with loss of cohesion is nowadays performed usually with inorganic compatible products, such as calcium or barium hydroxide or ethyl silicate. The use of organic consolidants as acrylic or vinilic resins is discouraged due to its physico-chemical incompatibility with the original lime-based renders; these organic products work as adhesive in the original substrate, while inorganic consolidants contribute to recover the cohesion loss improving the binder amount and guarantying better durability and full compatibility.The restoration intervention on historic mortars, including consolidation, often causes aesthetic heterogeneity and prejudices, sometimes dramatically, the global legibility of the architectonic surface. The aesthetic function can be restored by chromatic reintegration, through several techniques, with resource to overpaints, for instance based on calcium hydroxide, pigments and silicates.In this study several consolidant lime-based products were produced and characterized. Pigments were added to the products, in order to achieve chromatic reintegration properties as well as consolidation. The consolidant products consist in aqueous dispersion of calcium hydroxide, a pozzolanic additive (metakaolin or diatomite) and mineral pigments, namely a yellow earth pigment and a synthetic red pigment. The incorporation of a pozzolanic material was made to improve the mechanical strength and durability of the binder.The consolidant products were applied on mortar specimen with a simulated cohesion loss, through a reduced binder quantity and an optimization of the aggregate grain size. Specimens were subjected to different storage conditions (50 and 95% RH), to verify the influence of curing conditions. Physico-mechanical and microstructural characterization was performed on the treated mortar specimens to verify the consolidant treatment efficacy. Consolidant treatments show intesting results, and their efficacy vary depending on the pozolanic addition; pigments do not influence that much the consolidation efficiency.

000002231 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000002231 653__ $$aConsolidation products, historical renders, pozzolanic materials, chromatic reintegration, compatibility.

000002231 7112_ $$a3rd Historic Mortars Conference$$cGlasgow, Scotland (UK)$$d2013-09-11 / 2013-09-14$$gHMC13
000002231 720__ $$aBorsoi, G.$$iSilva, A. Santos$$iFaria, P.$$iVeiga, R.$$iPinto, J. P.$$iPascoal, P.
000002231 8560_ $$ffischerc@itam.cas.cz
000002231 8564_ $$s457507$$uhttp://invenio.itam.cas.cz/record/2231/files/Borsoi - Chromatic reintegration of historical mortars with lime-based pozzolanic consolidant products.pdf$$y
             Original version of the author's contribution as presented on CD, .
            
000002231 962__ $$r2223
000002231 980__ $$aPAPER