Characterization, morphology and shear bond strength analysis of geopolymers: Implications for oil and gas well cementing applications

2017 ◽  
Vol 38 ◽  
pp. 323-332 ◽  
Author(s):  
Saeed Salehi ◽  
Mohammad Jamal Khattak ◽  
Akila H. Bwala ◽  
F. Karbalaei S.
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Oil And Gas ◽  
Strength Analysis ◽  
Gas Well

scholarly journals Heat treatment following surface silanization in rebonded tribochemical silica-coated ceramic brackets: shear bond strength analysis

2013 ◽  
Vol 21 (4) ◽  
pp. 335-340 ◽  
Author(s):  
Emilia Adriane Silva ◽  
Flavia Zardo Trindade ◽  
Helcio Nagib Jose Feres Reskalla ◽  
Jose Renato Cavalcanti de Queiroz
Keyword(s):  
Heat Treatment ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Strength Analysis ◽  
Ceramic Brackets

scholarly journals Comparative Evaluation of the Shear Bond Strength of a Total Etch Adhesive with a Self-Etching Primer on an Endodontically Treated Teeth

2012 ◽  
Vol 3 (3) ◽  
pp. 247-249
Author(s):  
Shamina Bawa
Keyword(s):  
Bond Strength ◽  
Comparative Evaluation ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Strength Analysis ◽  
Endodontically Treated Teeth ◽  
Dentin Bonding ◽  
Bonding System ◽  
Group I

ABSTRACT The present in vitro investigation evaluated the shear bond strength of endodontically treated teeth restored with composite resin in conjunction with a total etch adhesive excite and a selfetching primer, Prompt-L-Pop. The aim of this study was to evaluate and compare the bond strength of two generation bonding systems when used on endodontically treated teeth. Twenty-four freshly extracted noncarious intact human maxillary and mandibular teeth were selected for this study. They were divided into 2 groups of 12 teeth each. The occlusal surface of the teeth was ground to prepare flat dentin surface. In group I, 5th generation dentin bonding system excite was used and in group 2, Prompt-L-pop, a self-etching primer was used. Both the dentin bonding agents were placed on the flat dentinal surfaces according to the manufacturer's instructions. Cylinders of composite resin were built on the prepared surface using Teflon mold. The prepared specimen were then embedded on an acrylic jig of suitable dimension and transferred to Instron machine for shear bond strength analysis. Shear bond strengths were measured at a cross head speed of 0.03 mm/sec. How to cite this article Bawa S, Hegde MN. Comparative Evaluation of the Shear Bond Strength of a Total Etch Adhesive with a Self-Etching Primer on an Endodontically Treated Teeth. World J Dent 2012;3(3):247-249.

Comparative experimental evaluation of drilling fluid contamination on shear bond strength at wellbore cement interfaces

2014 ◽  
Vol 11 (6) ◽  
pp. 597-604 ◽  
Author(s):  
Mileva Radonjic ◽  
Arome Oyibo
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Cement Slurry ◽  
Geothermal Wells ◽  
Sustained Casing Pressure ◽  
Zonal Isolation ◽  
Casing Pressure ◽  
The Impact

Wellbore cement has been used to provide well integrity through zonal isolation in oil and gas wells as well as geothermal wells. Failures of wellbore cement result from either or both: inadequate cleaning of the wellbore and inappropriate cement slurry design for a given field/operational application. Inadequate cementing can result in creation of fractures and microannuli, through which produced fluids can migrate to the surface, leading to environmental and economic issues such as sustained casing pressure, contamination of fresh water aquifers and, in some cases, well blowout. To achieve proper cementing, the drilling fluid should be completely displaced by the cement slurry, providing clean interfaces for effective bond. This is, however, hard to achieve in practice, which results in contaminated cement mixture and poor bonds at interfaces. This paper reports findings from the experimental investigation of the impact of drilling fluid contamination on the shear bond strength at the cement-formation and the cement-casing interfaces by testing different levels of contamination as well as contaminations of different nature (physical vs. chemical). Shear bond test and material characterization techniques were used to quantify the effect of drilling fluid contamination on the shear bond strength. The results show that drilling fluid contamination is detrimental to both cement-formation and cement-casing shear bond strength.

scholarly journals Recycling effects on ceramic brackets: a dimensional, weight and shear bond strength analysis

1997 ◽  
Vol 19 (6) ◽  
pp. 629-636 ◽  
Author(s):  
R. Martina ◽  
A. Laino ◽  
V. Cacciafesta ◽  
P. Cantiello
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Strength Analysis ◽  
Ceramic Brackets

Evaluation of Shear Bond Strength of Fiber-reinforced Composite and Methacrylate-based Composite to Pure Tricalcium-based Cement

2016 ◽  
Vol 8 (1) ◽  
pp. 25-27
Author(s):  
Ravula A Reddy ◽  
RS Basavanna
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
High Stress ◽  
Short Fiber ◽  
Strength Analysis ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Group I

ABSTRACT Aim Fracture of restorative composite is reported as a common reason for replacement. Due to failures of this kind, it is still controversial whether restorative composites should be used in large, high-stress-bearing applications, such as in direct posterior restorations. The high brittleness of current composites hinders their use in large stress-bearing areas. Thus, recently short fiber-reinforced composite was introduced as dental restorative composite resin. The aim of the article is to evaluate shear bond strength of fiber-reinforced composite (everX Posterior) and methacrylate-based composite (FILTEK Z250) to pure tricalcium silicate-based cement (biodentine). Materials and methods Acrylic blocks (n = 30) with 2 mm high and 5 mm diameter central holes were prepared. The samples were taken and filled with biodentine and were divided into two groups containing 15 in each group. Group I: Fiber-reinforced composite. Group II: Methacrylate-based composite, which are layered over biodentine. The specimens are transferred to the universal testing machine and subjected to shear bond strength analysis at a cross-head speed of 1.0 mm/minute. Results The bond strength values were significantly higher in case of fiber-reinforced composite when compared with methacrylate-based composite. Conclusion Within the limitations of the study, it was concluded that the fiber-reinforced composite with biodentine had highest bond strength when compared with methacrylate-based composite. Clinical significance Fiber-reinforced composite has excellent fatigue resistance because the embedded fibers are bonded to the polymer matrix and allow the stresses to be distributed effectively throughout the restoration. They are most suitable for applications in which the direction of highest stress is predictable. They are used in cavities with three or more surfaces missing and also in large-sized cavities. They are extensively used in cavities where inlays and onlays are prescribed. How to cite this article Reddy RA, Basavanna RS. Evaluation of Shear Bond Strength of Fiber-reinforced Composite and Methacrylate-based Composite to Pure Tricalcium-based Cement. CODS J Dent 2016;8(1):25-27.

Study and Use of Geopolymer Mixtures for Oil and Gas Well Cementing Applications

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Saeed Salehi ◽  
Mohammad Jamal Khattak ◽  
Nasir Ali ◽  
C. Ezeakacha ◽  
Fatemeh K. Saleh
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Oil And Gas ◽  
Free Water ◽  
Material Behavior ◽  
Ductile Material ◽  
Oil Well ◽  
Water Test ◽  
Class F Fly Ash

The study here presents laboratory testing results of Class F fly ash geopolymer for oil well cementing applications. The challenge reported in literature for the short thickening time of geopolymer ash has been overcome in this study, where more than 5 h of the thickening time is achievable. API Class H Portland cement used a controller on all the tests conducted in this work. Tests conducted in this research include unconfined compressive strength (UCS), shear bond strength, thickening time, shrinkage, free water, and cyclic and durability tests. Results indicate temperature as a crucial factor affecting the thickening time of geopolymer mix slurry. UCS testing indicates considerably higher compressive strength after one and fourteen days of curing for geopolymer mixtures. This indicates gaining strength with time for geopolymer mixture, where time retrogression effects are observed for Portland cements. Results also indicate higher shear bond strength for geopolymer mix that can better tolerate debonding issues. Additionally, more ductile material behavior and higher fracture toughness were observed for optimum geopolymer mixes. Tests also show applicability of these materials for deviated wells as a zero free water test was observed.

Study on Plasma Treatment and Adhesion of Wood/Polyethylene Composites

2011 ◽  
Vol 66-68 ◽  
pp. 911-915 ◽  
Author(s):  
Yan Tao ◽  
Ming Wei Di
Keyword(s):  
Contact Angle ◽  
Bond Strength ◽  
Plasma Treatment ◽  
Shear Bond Strength ◽  
Strength Analysis ◽  
Ftir Analysis ◽  
Air Plasma ◽  
Discharge Time ◽  
Adhesion Properties ◽  
Pressure Glow Discharge

The surface of wood/polyethylene (PE) composites was treated by low-pressure glow discharge of air plasma to improve its adhesion properties. And the changes on the surface properties of the treated composites under different discharge time were studied by contact angle, AFM and FTIR analysis. To determine the effect of plasma treatment on the adhesion of the composites, shear bond strength tests were conducted. The results showed that the contact angle decreased gradually with the increasing of discharge time. The roughness of plasma treated samples increased. The FTIR analysis results showed that the polar groups such as -OH, -C=O and -O-C=O were formed on the surface of the composites treated under plasma. The data of shear bond strength analysis also showed that the adhesion strength of composites increased remarkably after plasma treatment, and the durability of bonding joint under water and heat environments also be improved.

Silicon‐based film on the yttria‐stabilized tetragonal zirconia polycrystal: Surface and shear bond strength analysis

2019 ◽  
Vol 10 (4) ◽  
Author(s):  
Alecsandro de Moura Silva ◽  
Viviane Maria Gonçalves de Figueiredo ◽  
Marcos Massi ◽  
Renata Falchete do Prado ◽  
Argemiro Soares da Silva Sobrinho ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Tetragonal Zirconia ◽  
Strength Analysis ◽  
Silicon Based ◽  
Tetragonal Zirconia Polycrystal

Applicability of Geopolymer Materials for Well P&A Applications

2017 ◽  
Author(s):  
Saeed Salehi
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Oil And Gas ◽  
Material Behavior ◽  
Ductile Material ◽  
High Durability ◽  
Research On Application ◽  
Class F Fly Ash ◽  
Work Class

Previous research on application of geopolymers in oil/gas wells is mainly unsuccessful due to failure to achieve a reasonable thickening time. This study presents geopolymer composite mixtures that have high compressive and shear bond strength, enhanceed thickening time, high durability, and reasonable shrinkage. Class F fly ash geopolymers are used for developing samples with different mix designs in this work. Class H Portland cement is used as a controller on all the tests conducted in this work. Tests conducted in this research include: unconfined compressive strength (UCS), shear bond strength, thickening time, and durability tests. Results indicate temperature as a crucial factor affecting the thickening time of geopolymer mix slurry. More than four hours thickening time is achieved by optimizing mix design and applying a developed mix of superplasticizer and retarder. UCS testing indicates a high compressive strength after one and fourteen days of curing for geopolymer mixtures. More than 6000 psi strength is achieved in long term (28 days curing). This indicates strength gained over time, for geopolymer mixture, where strength retrogression effects are observed for Portland cements. Results also reveal higher shear bond strength for Geopolymer mix, which can better tolerate de-bonding issues. Additionally, more ductile material behavior and higher fracture toughness, were observed for optimum geopolymer mixes. Final observations confirm applicability of these materials for oil and gas well cementing with circulating temperatures up to 300°F.

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