Influence of elevated temperature on axially loaded expansive cement grout borehole plug sealing performance

Date

2000-10-01

Author

Akgün, Haluk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

47
views

0
downloads

The strength of expansive cement grout borehole plugs cast in rock cylinders is investigated theoretically and experimentally as a function of curing and testing temperature of the plugged rock cylinder and of borehole size. The distributions of thermally induced stresses and displacements, shear stresses along the plug-rock interface due to an axial stress applied to the plug, and resultant interfacial shear stresses due to a combination of uniform elevated temperature and axial load are studied and analysed. Conservative in this analysis is the assumption of elastic behaviour and the fact that the strength tests were conducted after a cement grout curing period of only eight days. Details on experimental procedure regarding sample curing conditions, experimental apparatus and sample loading are presented. The axial strength decreases with increasing curing and testing temperature and with increasing plug radius. The results of the theoretical analysis lead to a recommendation to design plugs with a length-to-radius ratio of at least 8 in order to reduce the thermal shear stresses at the plug-rock interface to acceptable levels.

Subject Keywords

General Materials Science, Civil and Structural Engineering, Building and Construction

URI

https://hdl.handle.net/11511/46433

Journal

MAGAZINE OF CONCRETE RESEARCH

DOI

https://doi.org/10.1680/macr.2000.52.5.379

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Influence of degree of saturation on the borehole sealing performance of an expansive cement grout Akgün, Haluk (Elsevier BV, 2000-02-01) The strength measures of expansive cement grout borehole plugs cast in welded tuff cylinders is investigated as a function of the degree of saturation of the plugged rock cylinder and of borehole size. Details on experimental procedure regarding rock cylinder and cement grout preparation, sample curing conditions, experimental apparatus, sample loading, mechanical characterization of the rock, and cement grout, along with procedures for the determination of the sample saturation assuming uniform saturation,...
Analysis of the effects of vertical pre-release cracks on prestressed concrete bridge girders Baran, Eray; French, Catherine; Wyffels, Tina (Precast/Prestressed Concrete Institute, 2004-11-01) Vertical cracks, termed "pre-release cracks," beginning at the top flange and propagating downward into the section depth have been observed to develop during the production of long-span prestressed concrete bridge girders. The cracking which is attributed to the restrained shrinkage the concrete and thermal effects during the curing period prior to release of the prestressing strands, tends to be more critical for long-span girders with deep sections and large amounts of prestressing strands. Studies were ...
Analytical prediction of thermal displacement capacity of integral bridges built on sand Dicleli, Murat (SAGE Publications, 2005-02-01) In this research, analytical equations are developed to calculate the lateral displacement capacity and maximum length limits of integral bridges built on sand based on the low-cycle fatigue performance of the piles under cyclic thermal variations and the ultimate strength of the abutment under positive thermal variations. To formulate the displacement capacity and maximum length limits of integral bridges based on the low cycle fatigue performance of steel H-piles under cyclic thermal variations, first, H-...
Hybrid fiber reinforced self-compacting concrete with a high-volume coarse fly ash Sahmaran, Mustafa; Yaman, İsmail Özgür (Elsevier BV, 2007-01-01) This paper presents a study on the fresh and mechanical properties of a fiber reinforced self-compacting concrete incorporating high-volume fly ash that does not meet the fineness requirements of ASTM C 618. A polycarboxylic-based superplasticizer was used in combination with a viscosity modifying admixture. In mixtures containing fly ash, 50% of cement by weight was replaced with fly ash. Two different types of steel fibers were used in combination, keeping the total fiber content constant at 60 kg/m(3). S...
Influence of transverse crack width on reinforcement corrosion initiation and propagation in mortar beams Sahmaran, Mustafa; Yaman, İsmail Özgür (Canadian Science Publishing, 2008-03-01) This paper discusses the relationship between crack widths, chloride diffusivity, and corrosion rate of cracked mortar beams. Flexural loads are introduced to generate crack widths ranging from 29 to 390 mu m. The specimens were subjected to accelerated corrosion by immersion in a 5% NaCl solution and a constant voltage of 12 V. In addition, salt ponding tests were conducted to determine the chloride ion transport properties. The results showed that as the crack width increased, the effective diffusion coef...

Citation Formats

H. Akgün, “Influence of elevated temperature on axially loaded expansive cement grout borehole plug sealing performance,” MAGAZINE OF CONCRETE RESEARCH, pp. 379–394, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46433.