Application of a Sclerometer to the Preliminary Assessment of Concrete Quality in Structures After Fire

Archives of civil engineering

R. Kowalski^1¹  J. Wróblewska^2² 

[1] Warsaw University of Technology, 00-637, Warsaw, Poland^1;Warsaw University of Technology, 00-637, Warsaw, Poland^2

关键词: concrete;    high temperature;    fire;    nondestructive test;    sclerometer;    Schmidt hammer;    rebound number;   

DOI  :  10.2478/ace-2018-0069

学科分类：建筑学

来源: Polska Akademia Nauk * Instytut Podstawowych Problemow Techniki / Polish Academy of Sciences, Institute of Fundamental Technological Research

【 摘 要 】

The paper presents a description and results of a study focused on the applicability of the sclerometric method to the preliminary assessment of concrete quality in structures after fire. Due to the high thermal inertia, concrete has non-uniform properties in the heated element cross-section. The greatest reduction of concrete compressive strength occurs on the heated surface. When assessing a structure after a fire, it is particularly important to determine the thickness of the damaged external concrete layer. Reinforced concrete beams exposed to high temperature on one side (a one-way heat transfer in the cross-section) for 0 (unheated element), 60, 120, 180 and 240 minutes were examined. A significant decrease of the rebound number on the elements heated surface was observed, depending on the heating duration. The obtained values of the relative rebound number reduction were comparable to the values of relative compressive strength decrease (determined on the basis of temperature) of concrete situated 15 mm from the heated surface.

【 授权许可】

Unknown