Abstract
Square rebars were developed and used for decades in the early development of reinforced concrete (RC) structures; however, the objectives of modern concrete structure durability analyses and standards are centered on round rebars in past decades, which are not suited for RC buildings utilizing square rebars. Considering the absence of proper evaluation techniques to evaluate the square rebar RC structures’ durability accurately, a novel durability prediction method has been proposed for this type of historical building. The method is based on major parts as in-situ investigation, finite element model simulation, component importance analysis, and structural durability prediction. The durability prediction calculation method was established on the experimental results of the realistic historical concrete tests and corrosion-induced cover cracking experiments for square rebar components. It was found that the carbonization-resistant ability of historical concretes was relatively weaker than that of current concretes and the calculation method for critical corrosion depth of square rebar was different from that of round rebar. Furthermore, two typical application cases are presented to introduce the procedure of the method in detail. Consequently, the research outcomes can be directly used on the durability prediction and protection works for historical RC buildings.
Highlights
After the electrical wires were welded on the reinforcement, the side surfaces and the external rebars were coated with approximately 2 mm epoxy resin
Square rebars were widely utilized for the reinforced concrete (RC) buildings for decades in a period of history, and the majority of the buildings have been and will be still used due to their historical and cultural value; there has been no proper durability evaluation method for these historical square rebar RC buildings
A reliable and applicable durability prediction method for historical square rebar RC structures is proposed, which can solve the problem where the current standard cannot be used for the durability assessment work for historical square rebar reinforced concrete structures
Summary
Almost all studies related to durability prediction and corrosion induced cracking for reinforced concrete (RC) components and structures focus on the round rebar cases [1,2,3,4,5,6,7,8,9,10]. The concrete structure design standards and codes in many countries and states default that the type of reinforcement is round steel rebar [11,12,13], without any application description for square steel rebar. Round rebars are presently the most often utilized steel material in RC constructions, square rebars were commonly used throughout history (approximately between 1900s and 1940s), in Europe [14,15], America [16,17] and China [14]. The China standard [18] and report from
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