000002920 001__ 2920
000002920 005__ 20141118153415.0
000002920 04107 $$acze
000002920 046__ $$k2010-09-22
000002920 100__ $$aDiekamp, A.
000002920 24500 $$aLime mortar with natural hydraulic components – characterization of reaction rims with FTIR-imaging in ATR-mode

000002920 24630 $$n2.$$pHistoric Mortars and RILEM TC 203-RHM Final Workshop
000002920 260__ $$bRILEM Publications s.a.r.l., 157 rue des Blains F-92220 Bagneux - France
000002920 506__ $$arestricted
000002920 520__ $$2eng$$aReaction rims of natural hydraulic relicts in historic mortars were investigated using a novel technology, a FTIR-spectrometer equipped with a focal plane array detector enabling in ATR-mode IR-imaging with a spatial resolution of 1.0 m. IR spectra show two regions with main absorption bands at 1280– 1580cm-1 and 900–1120cm-1. Bands at 1450cm-1 and 1396cm-1 correspond to the asymmetric stretching of CO32-, indicating two different forms of CaCO3; the 900– 1120cm-1 group of bands is assigned to Si-O stretching vibrations indicating C–S– H phases. The ratio of the integral absorbance of these two main regions of absorption bands shows an inhomogeneous spatial distribution in the reaction rim. Our investigation shows that the reaction rims consist of CaCO3, C–S–H phases and SiO2 gel in variable proportions. In areas with low carbonate-to-C–S–H phase ratios, carbonate is mainly present as metastable aragonite. The associated C–S–H phases show a comparatively low Ca/Si ratio and a high degree of polymerization. In areas with high carbonate-to-C–S–H phase ratios, both, aragonite and calcite are present. The C–S–H phases show a comparatively higher Ca/Si ratio combined with a lower degree of polymerization. The presence of SiO2 gel and aragonite indicate carbonation of C–S–H phases. The matrix outside of the cloudy reaction rim consists mainly of calcite. FTIR imaging measured in ATR-mode is a promising method to gain information on the hydraulicity of natural hydraulic mortars in its spatial distribution on a micrometer scale and to characterize the hydration and carbonation products as well.

000002920 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000002920 653__ $$a

000002920 7112_ $$a2nd Conference and of the Final Workshop of RILEM TC 203-RHM$$cPrague (CZ)$$d2010-09-22 / 2010-09-24$$gHMC2010
000002920 720__ $$aDiekamp, A.$$iMirwald, P.W.$$iKonzett, J.$$iStalder, R.
000002920 8560_ $$ffischerc@itam.cas.cz
000002920 8564_ $$s305066$$uhttp://invenio.itam.cas.cz/record/2920/files/page_0111.pdf$$y
             Original version of the author's contribution as presented on CD, , page 111.
            
000002920 962__ $$r2907
000002920 980__ $$aPAPER