Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

Autor:	Germán Darío Ercolani, Lilia Señas, Carla Priano, Néstor F. Ortega
Rok vydání:	2017
Předmět:	Materials science Suction Ciencias Físicas Carbonation 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Otras Ciencias Físicas 0201 civil engineering CONCRETE 021105 building & construction Ultimate tensile strength Water cooling General Materials Science Bearing capacity PETROGRAPHY Composite material Porosity TEMPERATURE Civil and Structural Engineering business.industry Building and Construction Structural engineering Compressive strength Mechanics of Materials Extinction (optical mineralogy) NONDESTRUCTIVE TESTS business CIENCIAS NATURALES Y EXACTAS
Zdroj:	Structural Concrete. 18:487-495
ISSN:	1464-4177
DOI:	10.1002/suco.201500202
Popis:	Over their lifetime, concrete structures can suffer from different pathologies, one of them is exposure to high temperatures, which diminishes their load-bearing capacity. This study describes how different concrete types were exposed to high temperatures. To simulate fire extinction, where the temperature of the overheated concrete descends suddenly, different cooling systems were applied: slowly cooling in the open air and fast cooling by spraying different water volumes. Several physical–mechanical characteristics were analyzed such as compressive strength, splitting tensile strength, porosity, capillary suction, and carbonation depth. Ultrasound nondestructive tests were conducted to quantify deterioration. A petrographic study using a stereomicroscope and microscopy of polarization was performed on thin sections to evaluate aggregate composition and concrete characteristics, focusing on interface areas. Physical and mechanical properties were affected by the increase in temperature, with damage worsening through the appearance of cracks and microcracks when water is used as a cooling system. Fil: Ercolani, Germán Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería. Área Hormigón; Argentina Fil: Ortega, Nestor Francisco. Universidad Nacional del Sur. Departamento de Ingeniería. Área Hormigón; Argentina Fil: Priano, Carla. Universidad Nacional del Sur. Departamento de Ingeniería. Laboratorio de Estudio y Ensayo de Materiales; Argentina Fil: Señas, Lilia Norma. Universidad Nacional del Sur. Departamento de Ingeniería. Laboratorio de Estudio y Ensayo de Materiales; Argentina
Databáze:	OpenAIRE
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