Metakaolin as a precursor of materials for applications in Cultural Heritage: Geopolymer-based mortars with ornamental stone aggregates
| Autor: | Clausi M.[1], Tarantino S.C.[1, Magnani L.L.[1], Riccardi M.P.[1], Tedeschi C.[3], Zema M.[1 |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
0211 other engineering and technologies Mineralogy 020101 civil engineering Sodium silicate 02 engineering and technology Cultural Heritage Geopolymer Metakaolin Geopolymer Alkali silicates Cultural Heritage 0201 civil engineering chemistry.chemical_compound Flexural strength Geochemistry and Petrology Aluminosilicate 021105 building & construction Composite material Metakaolin business.industry Alkali silicates Geology Masonry chemistry Carbonate Mortar business |
| Zdroj: | Applied clay science 132-133 (2016): 589–599. doi:10.1016/j.clay.2016.08.009 info:cnr-pdr/source/autori:Clausi M.[1], Tarantino S.C.[1,2], Magnani L.L.[1], Riccardi M.P.[1], Tedeschi C.[3], Zema M.[1,2]/titolo:Metakaolin as a precursor of materials for applications in Cultural Heritage: Geopolymer-based mortars with ornamental stone aggregates./doi:10.1016%2Fj.clay.2016.08.009/rivista:Applied clay science (Print)/anno:2016/pagina_da:589/pagina_a:599/intervallo_pagine:589–599/volume:132-133 |
| Popis: | Potentialities and suitability of metakaolin-based geopolymers in Cultural Heritage have been explored. In particular, in order to evaluate their possible use as restoration materials in conservation of historic manufactures, mortars have been prepared by adding aggregates of Italian ornamental stones to alkali-activated metakaolin with binder/sand ratio of 1:1. To improve workability, geopolymer binders have been synthesized from metakaolin and sodium silicate solution with water/solid weight ratios between 0.33 and 0.66 and SiO 2 /Al 2 O 3 and Al 2 O 3 /Na 2 O molar ratios of 3.70 and 1.04, respectively, and characterized by several techniques, including mechanical strength tests according to UNI EN 196-1. All binders display good mechanical properties, with compressive and flexural strength values as high as 72 MPa and 6 MPa, respectively, and decreasing with increasing water/solid ratio. The increase of water in geopolymer formulation has little negative effect on the aluminosilicate gel development and on the strength of these materials. Mortars display a homogeneous and compact matrix, bonded (silicoaluminate aggregates) or interlocked (carbonate) with aggregates. Their compressive strengths fall in the masonry mortars class M20 range. Their pore size distribution guarantees good breathability and adaptability to the substrate. The final materials mimic the original stones, with good aesthetic compatibility. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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