tailieunhanh - Revision of concrete performance at elevated temperatures: A critical review and initial results

In this paper, some major influencing factors and spalling of concrete at elevated temperatures will be first reviewed. Limitations of current test setups for fire test, with a focus on the questionable reliability of thermal boundary condition and deformation capturing, will then be discussed to highlight the need for improved setups. | ISSN 1859-1531 - TẠP CHÍ KHOA HỌC VÀ CÔNG NGHỆ ĐẠI HỌC ĐÀ NẴNG, SỐ 5(126).2018, Quyển 2 33 REVISION OF CONCRETE PERFORMANCE AT ELEVATED TEMPERATURES: A CRITICAL REVIEW AND INITIAL RESULTS ĐÁNH GIÁ LẠI SỰ LÀM VIỆC CỦA BÊ TÔNG Ở ĐIỀU KIỆN NHIỆT ĐỘ CAO: PHÂN TÍCH CHUYÊN SÂU VÀ CÁC KẾT QUẢ BAN ĐẦU Quang Xuan Le1,2, Dinh Ba Le1,2, Son Duy Tran1, Vinh The Ngoc Dao1* 1 School of Civil Engineering, The University of Queensland, Australia 2 University of Science and Technology - The University of Danang; ; ; ; Abstract - The performance of concrete at elevated temperatures depends on its mix constituents and proportions as well as their complex physio-chemical transformations during fire exposures. In this paper, some major influencing factors and spalling of concrete at elevated temperatures will be first reviewed. Limitations of current test setups for fire test, with a focus on the questionable reliability of thermal boundary condition and deformation capturing, will then be discussed to highlight the need for improved setups. On that basis, details of a new test setup will be presented. It will be shown that the use of radiant burner system and DIC technique with band-pass filter and blue illumination effectively addresses the identified limitations of existing systems: While the radiant burner system allows us to generate known and consistent thermal boundary conditions, the adoption of DIC technique with band-pass filter and blue illumination enables it to reliably capture deformation of concrete surfaces at elevated temperatures in a full-field, non-contact manner. With this new test setup established, a comprehensive set of reliable data can now be further collected, forming a solid basis for revising concrete performance in fire, taking into account the effects of temperature and temperature gradients. Tóm tắt - Sự làm việc của bê tông ở điều kiện nhiệt độ cao phụ thuộc vào thành phần, hàm .