scholarly journals Sonic Logging Vs PIT untuk Mendeteksi Integritas Pondasi Tiang

2011 ◽  
Vol 2 (2) ◽  
pp. 1031
Author(s):  
Gouw Tjie Liong
Keyword(s):  
Basic Theory ◽  
Load Testing ◽  
Destructive Testing ◽  
Pile Capacity ◽  
Advantages And Disadvantages ◽  
Integrity Testing ◽  
First Category ◽  
Sonic Logging ◽  
Second Category ◽  
Pile Integrity

Non destructive testing on piles can be divided into two main categories. The first category is to find out the integrity of the piles, such as pile integrity testing (PIT) and sonic logging. The second category is to find out the pile capacity, such as dynamic load testing/pile driving analysis. Since the early 1990s, the application of the tests was brought into practice and gained its popularity in Indonesia. However, the basic theory behind the testing has not been widely disseminated. This study tries to elaborate the first category of the testing, i.e. the pile integrity testing and sonic logging. The basic theory, the advantages and disadvantages, the application, the limitation and the interpretation of those techniques shall be discussed. Comparison on case studies of those testing methods also shall be given. 

Application of Crosshole Sonic Logging in Foundation Pile Integrity Detection

2012 ◽  
Vol 487 ◽  
pp. 139-142
Author(s):  
Xiao Xin Yan ◽  
Fei Yang ◽  
Wei Tao Li ◽  
Ai Hua Li
Keyword(s):  
Basic Theory ◽  
Detection Technology ◽  
Foundation Pile ◽  
Sonic Logging ◽  
Engineering Projects ◽  
Pile Integrity

This article introduces the application of crosshole sonic logging in foundation pile integrity detection and the basic theory and application of crosshole sonic logging, and narrates the detection technology and way to judge detection results by engineering projects.

scholarly journals Non-destructive testing of bored piles

Technobius ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 0002
Author(s):  
Assel Tulebekova ◽  
Nurgul Shakirova ◽  
Aizhan Zhankina ◽  
Yerbolat Muratov
Keyword(s):  
Bearing Capacity ◽  
Integrity Test ◽  
Destructive Testing ◽  
Design Strength ◽  
Advantages And Disadvantages ◽  
Pile Shaft ◽  
Bored Piles ◽  
Sonic Logging ◽  
Non Destructive

Quality control of bored piles is a complex operation aimed at determining possible defects in the pile shaft and the strength of the pile material made by different technologies. The presence of pile shaft defects and a decrease in the strength characteristics of the pile shaft material lead to the development of negative processes at the stage of subsequent operation of the building and structure. It is known that the bearing capacity of the pile material should not be less than the bearing capacity of the ground. Consequently, it is necessary to strictly observe the quality of the concrete of the design strength values to ensure the reliability of the designed building concerning the service life. Nowadays different methods of nondestructive testing such as pile integrity test, cross-hole sonic logging. The paper presents a discussion of the advantages and disadvantages of each of them, experimental data also are given

scholarly journals Inductive Thermography as Non-Destructive Testing for Railway Rails

2021 ◽  
Vol 11 (3) ◽  
pp. 1003
Author(s):  
Christoph Tuschl ◽  
Beate Oswald-Tranta ◽  
Sven Eck
Keyword(s):  
Eddy Current ◽  
Electrical Discharge Machining ◽  
Rolling Contact ◽  
Heat Diffusion ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ir Camera ◽  
Advantages And Disadvantages ◽  
Average Crack ◽  
Non Destructive

Inductive thermography is a non-destructive testing method, whereby the specimen is slightly heated with a short heating pulse (0.1–1 s) and the temperature change on the surface is recorded with an infrared (IR) camera. Eddy current is induced by means of high frequency (HF) magnetic field in the surface ‘skin’ of the specimen. Since surface cracks disturb the eddy current distribution and the heat diffusion, they become visible in the IR images. Head checks and squats are specific types of damage in railway rails related to rolling contact fatigue (RCF). Inductive thermography can be excellently used to detect head checks and squats on rails, and the method is also applicable for characterizing individual cracks as well as crack networks. Several rail pieces with head checks, with artificial electrical discharge-machining (EDM)-cuts and with a squat defect were inspected using inductive thermography. Aiming towards rail inspection of the track, 1 m long rail pieces were inspected in two different ways: first via a ‘stop-and-go’ technique, through which their subsequent images are merged together into a panorama image, and secondly via scanning during a continuous movement of the rail. The advantages and disadvantages of both methods are compared and analyzed. Special image processing tools were developed to automatically fully characterize the rail defects (average crack angle, distance between cracks and average crack length) in the recorded IR images. Additionally, finite element simulations were used to investigate the effect of the measurement setup and of the crack parameters, in order to optimize the experiments.

Effects of the Source on Wave Propagation in Pile Integrity Testing

2010 ◽  
Vol 136 (9) ◽  
pp. 1200-1208 ◽  
Author(s):  
Hua-You Chai ◽  
Kok-Kwang Phoon ◽  
Dian-Ji Zhang
Keyword(s):  
Wave Propagation ◽  
Integrity Testing ◽  
Pile Integrity

Driven cast-in-situ pile capacity: insights from dynamic and static load testing

2021 ◽  
Author(s):  
Kevin N. Flynn ◽  
Bryan A. McCabe
Keyword(s):  
Dynamic Load ◽  
Shear Stresses ◽  
Load Testing ◽  
Pile Capacity ◽  
Compression Load ◽  
Shaft Resistance ◽  
Pile Installation ◽  
Cast Concrete ◽  
Load Tests

Driven cast-in-situ (DCIS) piles are classified as large displacement piles. However, the use of an oversized driving shoe introduces additional complexities influencing shaft resistance mobilisation, over and above those applicable to preformed displacement piles. Therefore, several design codes restrict the magnitude of shaft resistance in DCIS pile design. In this paper, a series of dynamic load tests was performed on the temporary steel driving tubes during DCIS pile installation at three UK sites. The instrumented piles were subsequently subjected to maintained compression load tests to failure. The mobilised shear stresses inferred from the dynamic tests during driving were two to five times smaller than those on the as-constructed piles during maintained load testing. This was attributed to soil loosening along the tube shaft arising from the oversized base shoe. Nevertheless, the radial stress reductions appear to be reversible by the freshly-cast concrete fluid pressures which provide lower-bound estimates of radial total stress inferred from the measured shear stresses during static loading. This recovery in shaft resistance is not recognised in some European design practices, resulting in conservative design lengths. Whilst the shaft resistance of DCIS piles was underpredicted by the dynamic load tests, reasonable estimates of base resistance were obtained.

scholarly journals Excellent Teachers’ Strategies in Managing Students’ Misbehaviour in the Classroom

2020 ◽  
Vol 16 (1) ◽  
pp. 46
Author(s):  
Rosilawati Sueb ◽  
Hamimah Hashim ◽  
Khadijah Said Hashim ◽  
Munirah Mohd Izam
Keyword(s):  
School Districts ◽  
Classroom Management ◽  
Structured Interviews ◽  
Teaching Experiences ◽  
Classroom Activities ◽  
The Third ◽  
First Category ◽  
Excellent Teachers ◽  
Student Misbehavior ◽  
Second Category

The study explores Excellent Teachers’ strategies in managing students’ misbehavior in the classroom. Students’ misbehavior are escalating and getting more variant and serious. The need to investigate how teachers manage the students’ behavior in the classroom is deemed important.  In this study the participants are Excellent Teachers or “Guru Cemerlang”  who earned their title as “Guru Cemerlang”, based on promotional basis, due to their expertise in their teaching areas, exhibition of exceptional qualities in their personality and leadership and accumulation of vast teaching experiences. This is a qualitative study utilized semi-structured interviews and email interviews as its data collection method.  The interviews were conducted on nine (9) Malay Muslim Excellent Teachers; seven (7) females and two (2) males from nine different schools of nine different school districts in Selangor. Their age ranges from thirty seven (37) to fifty three (53) years with teaching experiences ranging from ten (10) to thirty one (31) years. The strategies that Excellent Teachers utilize could be categorized into  three higher categories: the first category pertaining to the preparation and activities that excellent teachers carried out in the classroom, the second category is interaction, which is the communication and reaction of excellent teachers towards student misbehavior and the third category is the presentation of treatment pertaining to pleasant or unpleasant consequences. In this article only discussion on the first category of the strategy which pertain to preparation and activities that excellent teachers carried out in the classroom will be highlighted. The sub- strategies are recognized as early year preparation, conducive learning environment, and classroom activities. Keywords: classroom discipline, classroom management, classroom strategies, excellent teacher.

Predicting the Ultimate Bearing Capacity of Single Piles Based on CPTU

2011 ◽  
Vol 243-249 ◽  
pp. 4402-4407
Author(s):  
Yong Hong Miao ◽  
Guo Jun Cai ◽  
Song Yu Liu
Keyword(s):  
Load Test ◽  
Load Testing ◽  
Pile Capacity ◽  
Piezocone Penetration Test ◽  
Load Carrying ◽  
Load Tests ◽  
Pile Load Test ◽  
Single Piles ◽  
Pile Load Tests ◽  
Best Fit

Six methods to determine axial pile capacity directly based on piezocone penetration test (CPTU) data are presented and evaluated. Analyses and evaluation were conducted on three types piles that were failed during pile load testing. The CPT methods, as well as the CPTU methods, were used to estimate the load carrying capacities of the investigated piles (Qp ). Pile load test were used to determine the measured load carrying capacities (Qm). The pile capacities determined using the different methods were compared with the measured pile capacities obtained from the pile load tests. Two criteria were selected as bases of evaluation: the best fit line for Qp versus Qm and the arithmetic mean and standard deviation for the ratio Qp /Qm. Results of the analyses showed that the best methods for determining pile capacity are the CPTU methods.

Nonvascular Interventions: The Gastrointestinal System

2018 ◽  
pp. 512-522
Author(s):  
Thomas J. Ward ◽  
David G. Mobley ◽  
Joshua Weintraub
Keyword(s):  
Large Bowel ◽  
Gastrointestinal System ◽  
Hollow Viscus ◽  
Nonvascular Interventions ◽  
Interventional Radiologist ◽  
Adequate Nutrition ◽  
First Category ◽  
System P ◽  
Enteral Access ◽  
Second Category

The interventional radiologist has a diverse and expanding role to play in the management and treatment of patients with disorders of the gastrointestinal (GI) system. These patients generally fall into one of two broad categories. The first category includes patients who are unable to tolerate or achieve adequate nutrition by mouth. In these patients, the interventional radiologist may be consulted to obtain percutaneous enteral access so that nutrition or hydration may be administered. The second category includes patients with benign or malignant strictures or obstruction of a hollow viscus, be it the esophagus, stomach, or small or large bowel. In these patients, the goal is to treat the obstruction when possible, or else decompress proximal to the obstruction for palliation of symptoms.

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