Overview of Experimental Study and Theoretical Analysis of Concrete Beams after High Temperature

2012 ◽  
Vol 446-449 ◽  
pp. 2951-2954
Author(s):  
Dong Fu Zhao ◽  
Zuo Kai You ◽  
Dong Dong Liu
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Theoretical Analysis ◽  
Concrete Beams ◽  
Future Prospects ◽  
Concrete Members ◽  
High Temperature Mechanical Properties ◽  
The Future ◽  
Elevated Temperature Test ◽  
Temperature Test

After high temperature, mechanical properties and fire-resistant performance of concrete members has become one of the hotspots of study on fire resistance of structures. In this paper, the deficiencies of concrete beams at elevated temperature test and theoretical analysis are pointed out, the future prospects of concrete beams at elevated temperature is disscussed, some key problems are proposed to solve in the future.

Fecal Coliform Methods for Examination of Sea Water: Interlaboratory Evaluation of Split Sample Analysis

1978 ◽  
Vol 61 (4) ◽  
pp. 772-778
Author(s):  
John J Miescier ◽  
Virgil E Carr ◽  
John F Musselman ◽  
Santo A Furfari
Keyword(s):  
Elevated Temperature ◽  
Sea Water ◽  
The United States ◽  
Most Probable Number ◽  
Test Procedures ◽  
Probable Number ◽  
E Coli ◽  
Split Sample ◽  
Elevated Temperature Test ◽  
Temperature Test

Abstract An interlaboratory study was conducted to compare the effectiveness of the following 3 multiple-tube fermentation methods for determining the most probable number (MPN) of Escherichia coli in a split artificial sea water sample: ( 1 ) the 72-hr standard methods procedure of the American Public Health Association, (2) a 24-hr elevated-temperature test using A-l medium, and (3) a 24-hr elevated temperature test modified to include an initial 3-hr resuscitation period using A-l medium. The capability of the laboratories to perform the 3 test procedures was also compared. Split sample replicates with low, medium, and high levels of E. coli were examined in 18 laboratories in the United States and Canada. Data indicate that the laboratories performed each test with equal capability, and all 3 procedures were equally effective in enumerating the strain of E. coli used in this investigation. By virtue of its homogeneity and stability, the split sample served as an appropriate specimen for this study and could probably be used as a proficiency test specimen for evaluating laboratory analyst performance in the bacteriological examination of sea water.

Analysis of the Effect of Elevated Temperature on Reliability of Shear Strengthened Concrete Beams

2016 ◽  
Vol 691 ◽  
pp. 160-171
Author(s):  
Peter Sabol ◽  
Sergej Priganc
Keyword(s):  
Elevated Temperature ◽  
Ambient Temperature ◽  
Elevated Temperatures ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Polymer Materials ◽  
Shear Strengthening ◽  
Near Surface ◽  
Concrete Members ◽  
Original Strength

This article presents the results of experimental research focused on the shear strengthening of reinforced concrete beams with one of the latest and most promising method: NSM - Near surface mounted reinforcement. In recent years, research in this area focuses on combination of epoxy and FRP (fiber reinforced polymer) materials suitable for strengthening concrete elements. A traditional material: stainless steel was also used in this study but in non-traditional T-cross section in terms of strengthening of concrete members. Structural epoxy adhesives offer excellent properties but are very sensitive to elevated temperatures. Effect of increasing temperature gradually degrade their properties and subsequently decreased bond strength, whereas during cooling may acquire significant parts of the original strength. The influences of these factors were investigated in shear resistance of NSM strengthened concrete beams under four point bending at ambient temperature, at elevated temperature and after cooling to ambient temperature.

Experimental Study on the Stress-Temperature Curve of the Super High Early Strength Grouting Material at Elevated Temperature

2014 ◽  
Vol 638-640 ◽  
pp. 1521-1525
Author(s):  
Chang Zheng Sun ◽  
Qi Zhang ◽  
Tong Feng Zhao ◽  
Hai Nan Zhao
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Elevated Temperature ◽  
Temperature Curve ◽  
Compressive Test ◽  
Grouting Material ◽  
Mathematical Formulas ◽  
Early Strength ◽  
Temperature Test

Based on 75 cube specimens(100mm×100mm×100mm) of the super high early strength grouting material at elevated temperature,this paper describes the design of the high temperature test,compressive test and some relevant phenomena in testing,analyzes strength of the super high early strength grouting material at elevated temperature,and obtains the stress-temperature curves of the super high early strength grouting material at elevated temperature.By analyzing the staged characteristics of the curves,the regularity of the strength of the super high early strength grouting material at elevated temperature is discussed and some fitting mathematical formulas are suggested.

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