Evaluation of mechanical parameters in repair concrete with impact-echo test method

2011 ◽  
pp. 387-390
Author(s):  
S Moghadam ◽  
M Eftekhar ◽  
M Shekarchi ◽  
S Javidmehr ◽  
A Dousti ◽  
...  
Keyword(s):  
Test Method ◽  
Mechanical Parameters ◽  
Impact Echo

Internal Imperfection Detection of Concrete Composite Component Using Ultrasonic Method and Impact-Echo Method

2013 ◽  
Vol 639-640 ◽  
pp. 1046-1050 ◽  
Author(s):  
Yun Feng Xiao ◽  
Da Hai Zhang ◽  
Li Liu
Keyword(s):  
Detection Method ◽  
Ultrasonic Method ◽  
Test Method ◽  
New Method ◽  
Masonry Structures ◽  
Composite Component ◽  
Impact Echo ◽  
The Impact ◽  
Impact Echo Method ◽  
Concrete Component

The ultrasonic method and the impact-echo method are two kinds of nondestructive test method (NDT), which are widely used, not only for concrete component, but for masonry structures. However, it is hard to detect the flaw in the concrete composite component if only with one kind of detection method. In this study, the principle of ultrasonic method and impact-echo method are outlined. And an attempt of a new method is taken, that Ultrasonic method together with Impact-echo method is used in detecting the deflection in Concrete Composite Component. It is proved that the result of this new method is more accurate and stable than that of only using ultrasonic method or impact-echo method. Introduction Introduction

Estimation of Depth of Concrete Column Members Using Impact Echo Method

2014 ◽  
Vol 605 ◽  
pp. 194-197
Author(s):  
Seung Hun Kim ◽  
Seong Uk Hong ◽  
Yong Taeg Lee ◽  
Seung Ho Lee
Keyword(s):  
Test Methods ◽  
Test Method ◽  
Concrete Column ◽  
Ground Field ◽  
Design Strength ◽  
Impact Echo ◽  
Destructive Test ◽  
The Impact ◽  
Non Destructive ◽  
Impact Echo Method

In order to maintain the existing concrete structures in a safe and usable state, an overall maintenance management is necessary regarding structure aging from quality management of new construction. Thus, non-destructive testing is needed to estimate the structure damage, defect, or proper construction without damaging the structure. In U.S., there is a standard for non-destructive test (ACI 228.2R-98), and also in Japan, the non-destructive test method and compressive strength estimation manual was prepared by the Architectural Institute of Japan in 1983, and there are active researches in the ground field, but it lacks verification in architecture field. Thus, in this study, a technique that can estimate the depth of concrete column member using the Impact Echo method which is one of the non-destructive test methods shall be reviewed and evaluated for applicability to the architecture field. The specimen was mixed with design strength of 30MPa. The equipment used in testing is Freedom Date Pc Platform Win.TFS 2.5.2 by company Olson of U.S., and the experiment involved leveling the top surface of the concrete member, installing the equipment and applying impact 9 times, and taking the average of the reverberation values obtained. The estimated average depth of concrete column member using Impact Echo method was 304mm for IEC-300, 398mm for IEC-400, and 484mm for IEC-500, and the relative error rate compared to the actual size was 1%~3%. Through this study, the applicability of estimation of depth in concrete column members using impact echo method could be confirmed.

scholarly journals TESTING MAGNESIA-CARBON BRICKS FOR OXIDATION RESISTANCE

2016 ◽  
Vol 22 (3) ◽  
pp. 164
Author(s):  
Jana Bounziova ◽  
Iveta Nagyová ◽  
Vincent Zajac ◽  
Lucia Hrabčáková ◽  
Pavol Vadász ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Test Method ◽  
Steel Ladle ◽  
Mechanical Parameters ◽  
Font Size ◽  
Test Procedures ◽  
Steel Metallurgy ◽  
Steel Research ◽  
Resistance To Oxidation ◽  
Slag Zone

<p> </p><p><span style="font-family: Times New Roman; font-size: small;">MgO-C based refractory materials are used in steel metallurgy to a large extent. Magnesia-carbon bricks are tested for basic physical-mechanical parameters in as supplied state, for carbon content, and chemical analysis of magnesium component. According to the type of their usage, they are subjected to tests at higher temperatures, carbonization firing, and after firing, the physical-mechanical parameters are determined at specified temperatures. One of the most tested properties of these materials is their resistance to oxidation. The methodology for such testing is not yet defined in ISO, EN and ASTM test procedures, therefore the methodology used in other countries is being applied. In conditions of U. S. Steel, Košice, s.r.o., the MgO-C bricks intended for the working lining of slag zones of steel ladles are tested by oxidation resistance test (oxidizing area procedure). </span><span style="font-family: Times New Roman; font-size: small;">The described test method was developed at U. S. Steel Research and Technology Center in Munhall and has been used for more than 15 years to evaluate various carbon containing bricks. Test specimens in the shape of a cube are heated in an oxidizing atmosphere to a temperature of 1482</span><span style="font-family: Times New Roman; font-size: small;">°C with holding time of 5 hours. After cutting of the test specimens, the percentage of oxidized area is calculated. This test is used for selecting the appropriate type of lining material for the working lining of slag zone of the steel ladle in the steelmaking secondary metallurgy process and for the building of database of different types of MgO-C bricks.</span></p><p> </p>

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