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

Authors
Ercolani, Germán Darío; Ortega, Nestor Francisco; Priano, Carla; Señas, Lilia Norma
Publication Year
2017
Language
English
Format
article
Status
Published version
Description
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
Subject
CONCRETE
NONDESTRUCTIVE TESTS
PETROGRAPHY
TEMPERATURE
Otras Ciencias Físicas
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/57485