AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: MIRON ZAPCIU, CONSTANTIN VOINIȚCHI, NICOLETA IONESCU, MARIUS OLTEANU.
DOI: 10.24193/subbchem.2021.4.18
Published Online: 2021-12-30
Published Print: 2021-12-30
pp. 253-265
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This research relates to cement-based matrix materials with self-repairing properties, based on reactive grains (Portland clinker) having the dimensions 90…160 μm and using a protective coating layer with a thickness of 4-7 μm. The material involves the use in mortars or concretes of a smart additive of a clinker reactive material covered with an impermeable polymeric coating that breaks when a crack appears in the material and allows the reaction between water and cement stone components and, consequently, the formation of a crack plugging product consisting in calcium silicate hydrates gels (CSH), superior to that of calcium carbonate precipitation. The intelligent addition is obtained by mixing the reactive material with the solution of a polymer, or with its melt (C8H8)n. The efficiency of coverage exceeds 80% in most of cases, some of them approaching even 90%. No significant effect of the ratio reactive material/polymer seems to be observed. The degree of healing of the crack is defined in the paper. The method of highlighting the self-repairing effect is based on the amount of electricity passed through the sample. The new material has practically unchanged mechanical properties, a higher hydration capacity and a longer service life-cycle.
Keywords: reactive grains, protective coating, self-repairing, new material
