Pulse Method Used for Non-Destructive Assessment of Glued Laminated Timber Beams

2016 ◽  
Vol 827 ◽  
pp. 231-234 ◽  
Author(s):  
Pavel Klapálek ◽  
Lenka Melzerová ◽  
Tomáš Plachy
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Pulse Method ◽  
Dynamic Modulus Of Elasticity ◽  
Glued Laminated Timber ◽  
Non Destructive ◽  
Timber Beams ◽  
The Way

This text is focused on GLULAM (glued laminated timber) beams and determination of their properties. This text is mainly focused just on part of more complex research of glued laminated timber beams. This text is focused on pulse method, which is used to determine the dynamic modulus of elasticity of GLULAM beams. This text will describe how the pulse method works, with basic description, describes the tested material and compare the results of testing. In the conclusion we discuss the results, make conclusions and describe the way of our further research of glued laminated timber beams.

Non-Destructive Testing of Glued Laminated Timber Beams with Use of Pilodyn 6J – Method of Spike

2016 ◽  
Vol 825 ◽  
pp. 23-26
Author(s):  
Pavel Klapálek ◽  
Lenka Melzerová
Keyword(s):  
Modulus Of Elasticity ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Glued Laminated Timber ◽  
Measurement Results ◽  
Non Destructive ◽  
Timber Beams ◽  
The Way

This article is focused on GLULAM (glued laminated timber) beams and determination of their properties by using non-destructive method. This text is mainly focused just on part of more complex research of glued laminated timber beams. This text is focused on non-destructive method, which is the method of spike that uses device called Pilodyn 6J for measurement. Results of this method are in form of Young ́s modulus of elasticity. This article will describe how the method of spike works, with basic description, describes the tested material and compare the results of testing. In the conclusion we discuss the results, make conclusions and describe the way of our further research of glued laminated timber beams.

Determination of the Dynamic Modulus of Elasticity and the Thickness of Concrete Structures by Non-Destructive Methods

2016 ◽  
Vol 691 ◽  
pp. 344-355
Author(s):  
Milan Pokorny ◽  
Norbert Jendzelovsky ◽  
Lenka Konecna
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Ultrasonic Method ◽  
Concrete Structures ◽  
Measuring Devices ◽  
Dynamic Modulus Of Elasticity ◽  
Non Destructive ◽  
Good Coincidence ◽  
Destructive Methods

This paper deals with the determination of selected parameters (the thickness and the dynamic modulus of elasticity) of concrete structures by non-destructive methods. Short overview of the literature, the description of used methods, measuring devices used during the tests, the descriptions of examined structures, and obtained results are mentioned. Two independent methods (the Ultrasonic Method and the Resonant Method, in some case with the combination of the Phase Velocity Method), had been used for determination of required parameters of structures. The results had been in good coincidence with the values mentioned in the literature. At the end of the paper, obtained results are summarized and future plans are presented.

Non-Destructive Testing for Concrete: Dynamic Modulus and Ultrasonic Velocity Measurements

2011 ◽  
Vol 243-249 ◽  
pp. 165-169 ◽  
Author(s):  
Iqbal Khan Mohammad
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Dynamic Modulus Of Elasticity ◽  
Non Destructive

Nondestructive testing (NDT) is a technique to determine the integrity of a material, component or structure. The commonly NDT methods used for the concrete are dynamic modulus of elasticity and ultrasonic pulse velocity. The dynamic modulus of elasticity of concrete is related to the structural stiffness and deformation process of concrete structures, and is highly sensitive to the cracking. The velocity of ultrasonic pulses travelling in a solid material depends on the density and elastic properties of that material. Non-destructive testing namely, dynamic modulus of elasticity and ultrasonic pulse velocity was measured for high strength concrete incorporating cementitious composites. Results of dynamic modulus of elasticity and ultrasonic pulse velocity are reported and their relationships with compressive strength are presented. It has been found that NDT is reasonably good and reliable tool to measure the property of concrete which also gives the fair indication of the compressive strength development.

Application of Non-Destructive Technology in Evaluating Concrete to Sulfate Attack

2010 ◽  
Vol 168-170 ◽  
pp. 2565-2570 ◽  
Author(s):  
Xu Guang Tang ◽  
You Jun Xie ◽  
Guang Cheng Long
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Sulfate Solution ◽  
Sulfate Attack ◽  
Sodium Sulfate Solution ◽  
Chemical Erosion ◽  
Dynamic Modulus Of Elasticity ◽  
Non Destructive

The deterioration on sulfate attack was investigated both in physical crystallization and the chemical erosion. Specimens that suffered long-term immersion and dry-wet cycles in saturated sodium sulfate solution are compared to trace the physical attack. And the chemical erosion was conducted by comparing specimens which have been suffered long-term immersion in saturated sodium sulfate solution and saturated limestone solution. In the investigation, the non-destructive detecting indexes, such as the ultrasonic velocity, and the dynamic modulus of elasticity were measured. The permeability, the porosity and mechanical strength at 28-day age were measured. The flexural/compressive strength was measured after 90 wet-dry cycles. And then all the specimens were cut into cubes to take the measure of compressive strength. Based on the experiments, feasibility of various parameters, such permeability, relative dynamic modulus of elasticity, ultrasonic velocity and relative flexural/compressive strength, were investigated to evaluate the concrete deterioration. The results indicate that there is a close relationship between the deterioration by sulfate attack and concrete permeability, so the reduction of permeability is effective in promoting the resistance. The index of the resistance expressed by the dynamic modulus of elasticity ratio is comparable to that expressed by the relative flexural strength. A novel method was suggested in evaluating concrete by sulfate attack, namely, combined with some mechanical tests, the parameter of relative dynamic modulus of elasticity can be used to evaluate the deterioration; the permeability denoted as the amount of transporting charges within 6 hours can be used to evaluate the properties to sulfate attack.

Comparison of Modulus of Elasticity of Glued Laminated Timber

2016 ◽  
Vol 714 ◽  
pp. 29-32
Author(s):  
Pavel Klapálek ◽  
Zdeněk Prošek ◽  
Vlastimil Králík
Keyword(s):  
Modulus Of Elasticity ◽  
Micromechanical Properties ◽  
Glued Laminated Timber ◽  
Non Destructive ◽  
Timber Beams

This article focuses on testing of glued laminated timber beams and researching their properties. The article mainly focuses on comparison of measured modulus of elasticity obtained by two different methods. First method used was method of spike which has non-destructive character. This method was used to measure properties of glued laminated timber (GLT) on macro mechanical level in form of modulus of elasticity. Second method was used to determine micromechanical properties of material and is called nanoindentation. Tested material will be also described the article along with principle of testing and presenting results. Those results of individual measurements will be compared with respect to percentage representation of individual phases on micromechanical levels to measurement on macromechanical level.

scholarly journals DETERMINATION OF DEFORMATION CHARACTERISTICS OF REINFORCED SOIL BASE BY EXPRESS METHOD USING DYNAMIC DENSITOMETER

2019 ◽  
Vol 10 (2) ◽  
pp. 5-12
Author(s):  
D. A Komarov ◽  
V. I Kleveko
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Reinforced Soil ◽  
Deformation Characteristics ◽  
Express Method ◽  
Static Modulus ◽  
Dynamic Modulus Of Elasticity ◽  
Static Modulus Of Elasticity ◽  
Express Methods

One way to improve the properties of soils is their reinforcement by different geosynthetic materials. Difficulty an objective assessment of the effectiveness of the use of geosynthetics in construction is its one of the reasons preventing their wider application. Conducting research aimed at studying the work of geosynthetic materials in the construction of foundations and their interaction with the ground, is a very costly and time consuming practice. The tests of reinforced soil structures for transport construction, which are influenced by dynamic loads are particularly complex. Geosynthetics can significantly improve the deformation characteristics of reinforced soil bases. Therefore, the use of different express methods for determination of deformation characteristics of reinforced soil bases is very important. Method using the dynamic densitometer is a new express methods for determining the deformation characteristics of subgrade. «Meter ground dynamic modulus DPG-1.2» was used as an apparatus for determining the dynamic modulus of elasticity Ed on the ground surface Dynamic modulus of elasticity Ed has a correlation dependence with a coefficient of compaction and static modulus of elasticity Est . One application of geosynthetic material in road construction is their use in the construction of temporary roads. Therefore, the construction of temporary road, representing a layer of sand of various thickness on the reinforcing geosynthetic interlayer modeled in this work. The carcass geogrid KS-16 «Rossomaha» production on JSC ««Krasnokamsk Metal Mesh Works» «and geotextile Geospan TN-50 manufactured by Ltd «HEXA-woven materials» were used as reinforcing geosynthetics. This article presents the results of the determination of the static modulus of elasticity Est and dynamic elasticity modulus Ed soil reinforced by geosynthetic material and soil without reinforcement using DPG-1.2 device. As a result of the experiment shows that the modulus values obtained with the express method of using the device-DPG 1.2 are comparable with the values of data obtained by the laboratory method, the measurement error does not exceed 22 %. For backfill thicknesses h = 50 mm use the carcass geogrid KS-16 can increase Est by 23 % and Ed by 14 % compared with the unreinforced base. Using the geotextile Hexa TN-50 can increase Est by 15.5 % and Ed by 11 % compared with the unreinforced base. Increasing the thickness backfill h up to 100 mm is practically not reduce the effectiveness of the reinforcement carcass geogrid KS-16 «Rosomaha» - static modulus E st is increased by 22 % and dynamic modulus Ed by 14 % compared to the unreinforced base. And for the geotextile Hexa TH-50 at h = 100 mm reinforcement efficiency is greatly reduced - the value Est and Ed only increased by 2.5 % compared with the unreinforced base. This is probably caused by a significantly greater rigidity carcass geogrid KS-16 «Rosomaha» Thus DPG-1.2 device allows accurately measure the deformation characteristics of soil bases. The use of specialized carcass geogrids KS-16 «Rossomaha «more effectively in the construction of temporary roads in comparison with universal geosynthetics Hexa TN-50.

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