Testing of Treatment Effects of Nano-sols on Selected Porous Historic Materials

Abstract eng:
Efficient nano materials for consolidation, cleaning and hydrophobization of porous historic materials have been developed in several European and national research projects. The authors have developed some new and have enhanced some existing experimental techniques for testing the effects of such conservation agents on historic materials in laboratory as well as in situ. The contribution presents in a comparative way namely consolidation effects of commercially available nano lime product CaLoSiL containing suspension of calcium hydroxide nano particles in different alcohols on porous stone or lime mortar. The resulting effects of these products on selected types of substrates have been assessed using specially developed non-standard testing methods which accommodated testing of unknown penetration abilities and the need to measure very subtle strengthening effects in laboratory, as well as on site. The innovative methods enabled to carry out a comparative study of the effect of various consolidation agents, taking advantage of destructive tests on purposely designed thin walled mortar elements, compacted sand or dry crashed stone specimens, small size stone specimens and thin plates. The influence of the quality of the substrate is well visible and helps to select "standard" materials for such comparative testing. Efficiency of these new nano materials has been measured by relation to effects of lime or barium water which were recommended consolidating agents in recent decades. Further, a non-automatic micro-tube device which measures water uptake have been devised for in situ testing of historic plaster. The poster further demonstrates potential of such non-traditional and affordable methods for approximate assessment of mechanical characteristics from non-mechanical data.

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