Specific features of injection hardening of cracked concrete structures and buildings with polyurethanes
| Autor: | Ya. A. Serednyts’kyi, V. I. Marukha |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Cement
Ettringite Structural material Materials science Serviceability (structure) Mechanical Engineering Chemical interaction Condensed Matter Physics chemistry.chemical_compound chemistry Mechanics of Materials Solid mechanics Hardening (metallurgy) Energy company Forensic engineering General Materials Science |
| Zdroj: | Materials Science. 44:720-725 |
| ISSN: | 1573-885X 1068-820X |
| DOI: | 10.1007/s11003-009-9127-1 |
| Popis: | The procedure of renovation of damaged concrete matrices by injecting flowing polyurethane compositions is described. It is shown that the process of filling of cracks is accompanied by the penetration of injected compositions into the weakened zones and impregnation of the surface layers of concrete. It is confirmed that the components of polyurethane compositions undergo chemical interaction with the OH-groups of cement stone and mineral fillers of concrete. It is demonstrated that the concrete–transition-layer–polyurethane joints formed as a result of the injection guarantee the required serviceability of concrete structures and buildings. The processes of destruction and failures of concrete and reinforced-concrete buildings and structures are accompanied by the formation and development of deep (often through) cracks in concrete matrices. The aim of the present work is to determine the technological and structural features of hardening and renovation of these objects by the injection filling of cracks and other defects in concrete with polyurethane compositions on the basis of the results of investigations and practical experience [1–8]. The advanced technologies of healing the cracks and defects aimed at the restoration of strength and serviceability of damaged concrete buildings and structures and developed at the Karpenko Physicomechanical Institute of the Ukrainian National Academy of Sciences and the “Tekhno-Resurs Engineering Center” State Enterprise of the Ukrainian National Academy of Sciences are now successfully applied at the plants of the “Energoatom of the Ukraine” National Nuclear Energy Company and Derzhbud of the Ukraine [1, 3, 7, 10]. The technological processes are based on the domestic technique of injection filling of defects in concrete matrices with flowing polyurethane compositions hardening at normal temperatures. In its scientific and engineering level, this technology is in no case inferior to the currently existing foreign achievements in this field [8, 9, 11, 12]. |
| Databáze: | OpenAIRE |
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