scholarly journals Using modified core drilling method to estimate the damage of fire exposed concrete

2017 ◽  
Vol 210 ◽  
pp. 3-10 ◽  
Author(s):  
Likang Tian ◽  
Xingyan Shang ◽  
Jiangtao Yu
Keyword(s):  
Core Drilling ◽  
Drilling Method

scholarly journals Structural drilling using the high-frequency (sonic) rotary method

2017 ◽  
Vol 64 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Jurij Šporin ◽  
Željko Vukelić
Keyword(s):  
High Frequency ◽  
Final Part ◽  
Frequency Method ◽  
High Quality ◽  
Core Drilling ◽  
Drilling Method ◽  
Highly Effective ◽  
Theoretical Foundations

AbstractIn Slovenia, there is widespread use of structural drilling along with classical core drilling. Recently, however, the need has arisen for a highly effective core drilling method with the aid of which high-quality core might be obtained. In order to achieve this aim, one among several Slovenian companies dealing with geological surveying has decided to implement structural drilling using a high-frequency drilling method. The following article presents the theoretical foundations for such a high-frequency method, as well as the manner of its implementation. In the final part of the article, a practical comparison between the conventional and the high-frequency core drilling methods is also provided.

scholarly journals Intragranular Residual Stress Evaluation Using the Semi-Destructive FIB-DIC Ring-Core Drilling Method

2014 ◽  
Vol 996 ◽  
pp. 8-13 ◽  
Author(s):  
Alexander J.G. Lunt ◽  
Alexander M. Korsunsky
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Titanium Aluminide ◽  
Ion Beam ◽  
Sample Surface ◽  
Image Correlation ◽  
Near Surface ◽  
Core Drilling ◽  
Drilling Method ◽  
Ring Core

Titanium aluminide (TiAl) is a lightweight intermetallic compound with a range of exceptional mid-to-high temperature mechanical properties. These characteristics have the potential to deliver significant weight savings in aero engine components. However, the relatively low ductility of TiAl requires improved understanding of the relationship between manufacturing processes and residual stresses in order to expand the use of such components in service. Previous studies have suggested that stress determination at high spatial resolution is necessary to achieve better insight. The present paper reports progress beyond the current state-of-the-art towards the identification of the near-surface intragranular residual stress state in cast and ground TiAl at a resolution better than 5μm. The semi-destructive ring-core drilling method using Focused Ion Beam (FIB) and Digital Image Correlation (DIC) was used for in-plane residual stress estimation in ten grains at the sample surface. The nature of the locally observed strain reliefs suggests that tensile residual stresses may have been induced in some grains by the unidirectional grinding process applied to the surface.

Influence Analysis of the Incorrect Construction Sequence on Concrete Strength of Cast-in-Place Piles

2013 ◽  
Vol 790 ◽  
pp. 255-258
Author(s):  
Zhao Qing Zhu ◽  
Jian Xun Wang ◽  
Zi Xia Feng
Keyword(s):  
Power Plant ◽  
Concrete Strength ◽  
Construction Sequence ◽  
Core Drilling ◽  
Quality Problem ◽  
The Core ◽  
Project Quality ◽  
Drilling Method ◽  
Construction Organization

The core drilling method is used for testing the concrete strength of the cast-in-place piles during the construction of a power plant. The concrete strength of some cast-in-place piles is far lower than the normal expected value. The incorrect construction sequence is the main cause of the quality problem. It is inadvisable to shorten the time limit for a project while ignoring the project quality. The more time will be spent to solve the quality problem of the project after the construction is complete. The construction organization is important for the quality of the projects and the reasonable construction sequence can improve the project quality.

Grouting Improvement in a Mined-Out Area under Tangshan-Tianjin Expressway, China

2015 ◽  
Vol 744-746 ◽  
pp. 505-509
Author(s):  
Ling Gao ◽  
Huan Sheng Mu
Keyword(s):  
Surface Subsidence ◽  
Differential Settlement ◽  
Reinforcement Effect ◽  
Core Drilling ◽  
Treatment Scheme ◽  
Technical Requirements ◽  
Geological Conditions ◽  
Drilling Method ◽  
Expressway Construction

Expressway construction in mined-out area is faced with some challenges, such as differential settlement and excessive deformation. This paper presents a case study of grouting improvement in a mined-out area under Tangshan-Tianjin expressway, China. The geological conditions in the mined-out area and the mechanisms of surface subsidence are described. A detailed grouting treatment scheme is planned and carried out to reinforce the rock masses. Technical requirements for grouting are described to ensure the reinforcement effect. Verification of the reinforcement effect is carried out using several techniques such as packer test and core drilling method. The results show that the proposed grouting scheme achieves desired effects.

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