Destructive and Nondestructive Characteristics of Old Concrete

2014 ◽  
Vol 1054 ◽  
pp. 243-247 ◽  
Author(s):  
Ondřej Holčapek ◽  
Jiří Litoš ◽  
Jan Zatloukal
Keyword(s):  
Modulus Of Elasticity ◽  
Destructive Testing ◽  
Loading Test ◽  
Rebound Hammer ◽  
Average Value ◽  
Static Modulus ◽  
Schmidt Rebound Hammer ◽  
Structural Engineer ◽  
Static Modulus Of Elasticity

This paper aims at determination of mechanical properties of 28 years old concrete with various nondestructive and destructive testing methods. All investigated parameters were determined on drilled cores with diameter 79.8 mm gained from existing bridge. On these samples Schmidt rebound testing and destructive force loading test were performed. Static (from loading test) and dynamic (measured by ultrasonic device) modulus of elasticity was also measured. The evaluation of destructive and nondestructive testing was according to the Czech Standards. Testing of old concrete from real structures is important especially prior to the reconstruction, strengthening or repair of the structure, when the structural engineer needs to know the characteristics. The compressive strength measured destructively on cylinders achieved average value 28 MPa, while the Schmidt rebound hammer test showed strength 44 MPa. The average value of static modulus of elasticity was 26 GPa.

scholarly journals Sistem Pengukuran Modulus Elastisitas Beton Menggunakan Metode Ultrasonic Pulse Velocity

2018 ◽  
Vol 8 (1) ◽  
pp. 25
Author(s):  
Amanda Purwanto ◽  
Abdul Ro’uf
Keyword(s):  
Modulus Of Elasticity ◽  
Mechanical Energy ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Compressive Test ◽  
Destructive Testing ◽  
Average Value ◽  
Static Modulus ◽  
Static Modulus Of Elasticity

Modulus of elasticity of concrete usually measured by Destructive Testing which is not considered as an effective way, because It will destroy the concrete. Ultrasonic Pulse Velocity can be a solution to measure value of modulus of elasticity without destructing it. The concept of the system is to look for velocity of wave, then put the value into modulus elasticity formula.UPV system will transmit ultrasonic wave through concrete. HC-SR04 used for generating 40 kHz wave, increasing voltage of wave on receiver, and calculating time travel. The voltage of wave sent by HC-SR04 is only about 10 volt, so that power and voltage of wave has to be amplified. Piezoelectric is used as a transducer which can converts electrical to mechanical energy.  The results of this research shows that error value on wave velocity measurement have an average value for about 18,2% compared to result of UPV Pundit. Static modulus of elasticity from compressive test is compared to value of dynamic modulus of elasticity that is obtained by UPV system with HC-SR04. Ratio between two values is about 45% - 249%.

Method of determination of static modulus of elasticity

1975 ◽  
Vol 32 (6) ◽  
pp. 380-382
Author(s):  
T. N. Keshishyan ◽  
A. I. Rabukhin ◽  
M. M. Smirnova ◽  
V. G. Dorofeev
Keyword(s):  
Modulus Of Elasticity ◽  
Static Modulus ◽  
Method Of Determination ◽  
Static Modulus Of Elasticity

scholarly journals Prediction of the Static Modulus of Elasticity Using Four non Destructive Testing

2014 ◽  
Vol 13 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Hugo Luis Chávez-García ◽  
Elia Mercedes Alonso-Guzmán ◽  
Wilfrido Martínez-Molina ◽  
Mario Graff ◽  
J. C Arteaga-Arcos
Keyword(s):  
Modulus Of Elasticity ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Static Modulus ◽  
Static Modulus Of Elasticity ◽  
Non Destructive

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.

Experimental Determination of how the Static Modulus of Elasticity is Influenced by the Value of the Upper Loading Stress

2018 ◽  
Vol 272 ◽  
pp. 64-69
Author(s):  
Dalibor Kocáb ◽  
Petr Misák ◽  
Petr Daněk ◽  
Barbara Kucharczyková ◽  
Romana Halamová
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Strong Influence ◽  
Testing Methods ◽  
Static Modulus ◽  
Number Of Factors ◽  
Static Modulus Of Elasticity ◽  
The Impact

There is a large number of factors that have a strong influence on the elastic modulus of concrete. These are technological influences as well as issues connected with the testing methods for its determination, one of which is the choice of the upper loading stress of cyclic loading during testing the static modulus of elasticity of concrete in compression. The upper loading stress should be equal to 1/3 of the specimen’s compressive strength, however, its choice is often made incorrectly. This paper describes an experiment focused on discovering the impact that deviating from the 1/3 upper loading stress has on the measured value of the static modulus of elasticity.

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