Abstract
This paper first introduces the structure of multiple-anticorrosive bolts and the anticorrosive mechanism. To thoroughly analyze the durability of multiple-anticorrosive bolts in a corrosive environment, different corrosive environments were simulated and experiments on the durability of double- and multiple-anticorrosive bolts were conducted. Apparent changes were observed and the bond strength after corrosion was measured. From these test data, the resistance to corrosion was compared for the two types of bolts, and formulae for the service life of double- and multiple-anticorrosive bolts were derived in different corrosive environments. At the same time, a number of modification coefficients for optimization of the service-life formulae were put forward. The anticorrosion performance of the multiple-anticorrosive bolt was mainly studied and compared with that of the double-anticorrosion bolt, and the multiple-anticorrosive bolt was verified to have superior durability in a corrosive environment. The conclusions drawn in this study can be applied in the design of anticorrosive bolts to be used in an underground structure and later applied in durability analysis, providing reference values for actual engineering.
Kurzfassung
Diese Arbeit präsentiert zunächst den Aufbau mehrfach korrosionsgeschützter Ankerbolzen und deren korrosionshemmenden Mechanismus. Um eingehend die Beständigkeit mehrfach korrosionsgeschützter Bolzen in einer korrosiven Umgebung zu untersuchen, wurden verschiedene korrosive Umgebungen simuliert und Experimente zur Beständigkeit von doppelt und mehrfach korrosionsgeschützten Bolzen durchgeführt. Die sichtbaren Veränderungen wurden betrachtet. Ferner wurde nach der Korrosionseinwirkung die Verbundfestigkeit gemessen. Auf Grundlage dieser Testdaten wurde die Korrosionsbeständigkeit der zwei Bolzentypen verglichen und Formeln für die Lebensdauer von doppelt und mehrfach korrosionsgeschützten Bolzen in unterschiedlichen korrosiven Umgebungen abgeleitet. Gleichzeitig wurden mehrere Änderungskoeffizienten zur Optimierung der Formeln zur Lebensdauer vorgeschlagen. Hauptsächlich wurde die Korrosionsschutzleistung des mehrfach korrosionsgeschützten Bolzens untersucht, mit der des doppelt korrosionsgeschützten Bolzens verglichen und die überlegene Beständigkeit des mehrfach korrosionsgeschützten Bolzens in korrosiver Umgebung überprüft. Die Ergebnisse aus dieser Untersuchung können bei der Konzeption für Tiefbaukonstruktionen vorgesehene korrosionsgeschützte Bolzen verwendet und später in der Lebensdaueranalyse eingesetzt werden, falls Referenzwerte für reale Konstruktionen vorliegen.
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