Experimental study of an innovative driven and grouted soil nail (x-Nail)

2020 ◽  
Author(s):  
Mohammad Zahidul Islam Bhuiyan ◽  
Shanyong Wang ◽  
John P. Carter
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Bond Strength ◽  
Innovative Design ◽  
Pullout Force ◽  
Soil Nail ◽  
Compaction Grouting ◽  
Pull Out ◽  
High Bond ◽  
High Bond Strength

This paper describes an experimental investigation of a newly developed driven and grouted soil nail (x-Nail), which combines the capabilities of a purely frictional driven nail and a compaction-grouted nail. The innovative design allows the x-Nail to be driven into the ground with a latex balloon attached that is used subsequently for compaction grouting. A grout bulb is thus formed at the driven end of the nail to improve its pull-out resistance. For compaction grouting, a special type of additive-mixed cement grout was used in this investigation because of its zero bleeding and high bond strength. A series of pullout model tests was conducted to examine the performance of the x-Nail compared to a purely frictional soil nail. It was found that more than 90% of the pullout force of the x-Nail was resisted by the expanded grout bulb and the end bearing resistance of the grout bulb increased with the increment of the injected grout volumes. The experimental results revealed that the pullout force of the x-Nail increased approximately 1800%, 1550%, 1200% and 900% compared to the purely frictional soil nail for the injected grout volumes of about 350 ml, 270 ml, 220 ml, and 170 ml, respectively.

Sol-Gel Coating Facilitating Si-to-Si Wafer Bonding at Low Temperature

2005 ◽  
Author(s):  
J. Wei ◽  
S. S. Deng ◽  
C. M. Tan
Keyword(s):  
Low Temperature ◽  
Bond Strength ◽  
Wafer Bonding ◽  
Intermediate Layer ◽  
Bonding Temperature ◽  
Sol Gel ◽  
Bond Quality ◽  
Bubble Generation ◽  
High Bond ◽  
High Bond Strength

Silicon-to-silicon wafer bonding by sol-gel intermediate layer has been performed using acid-catalyzed tetraethylthosilicate-ethanol-water sol solution. High bond strength near to the fracture strength of bulk silicon is obtained at low temperature, for example 100°C. However, The bond efficiency and bond strength of this intermediate layer bonding sharply decrease when the bonding temperature increases to elevated temperature, such as 300 °C. The degradation of bond quality is found to be related to the decomposition of residual organic species at elevated bonding temperature. The bubble generation and the mechanism of the high bond strength at low temperature are exploited.

Bonding of Polyethylene to Metals and Rubber with Hydrogenated Polybutadiene

1962 ◽  
Vol 35 (4) ◽  
pp. 1060-1062
Author(s):  
A. I. Yakubchik ◽  
S. Ya Grilikhes ◽  
B. I. Tikhomirov ◽  
V. S. Purlova
Keyword(s):  
Bond Strength ◽  
Adhesive Composition ◽  
High Bond ◽  
High Bond Strength ◽  
Hydrogenated Polybutadiene

Abstract The adhesive composition based on hydrogenated unbranched 1,4-polybutadiene gives a high bond strength between polyethylene and brass, and brass-plated metal, and rubber.

scholarly journals Numerical Analysis for the Progressive Failure of Binary-Medium Interface under Shearing

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Rihong Cao ◽  
Wenyu Tang ◽  
Hang Lin ◽  
Xiang Fan
Keyword(s):  
Shear Strength ◽  
Bond Strength ◽  
Normal Stress ◽  
Strength Ratio ◽  
Normal Stresses ◽  
Stress Increase ◽  
Tensile Cracks ◽  
Medium Interface ◽  
High Bond ◽  
High Bond Strength

Binary-medium specimens were fabricated using the particle flow code, and the shear strength, dilatancy, and failure behavior of the binary-medium specimens with different bond strength ratios (0.25, 0.5, 0.75, and 1.0) under different normal stresses were studied. Numerical results show that the bond strength ratio and normal stresses considerably influence the shear strengths of binary-medium interface. Shear strength increases as the bond strength ratio and normal stress increase. The dilation of interfaces with high bond strength ratios is more evident than those of interfaces with lower bond strength ratios, and the curves for the high bond strength ratio exhibit remarkable fluctuations during the residual stage. At increased normal stress and bond strength ratio, the peak dilation angle shows decreasing and increasing trends successively. In this study, the specimens exhibited three kinds of failure modes. In mode II, the sawtooth experienced shear failure, but some tensile cracks appeared on the interface of the binary-medium. In mode III, no sawtooth was cut off, indicating tensile failure on the interface. At a low bond strength ratio, damage or failure is mostly concentrated in the upper part of the model. Failure parts gradually transfer to the lower part of the model when the bond strength ratio and normal stress increase. Furthermore, evident tensile cracks occur on the interface. When the bond strength ratio reaches 1.0, the failure mode of the specimen gradually transforms from sheared-off failure to chip-off failure. The number of microcracks in the specimens indicates that the lower the bond strength ratio, the more severe the damage on the specimens.

scholarly journals Research on the Properties of High-strength Gypsum Based Tile Adhesive in Interior Decoration

2020 ◽  
Vol 165 ◽  
pp. 05015
Author(s):  
Ji Xiu Zhang ◽  
Ye Zhang ◽  
Ji Kang Liu ◽  
Yuan Chao Miao ◽  
Sai Hong Duan
Keyword(s):  
Bond Strength ◽  
Dimensional Stability ◽  
High Strength ◽  
High Dimensional ◽  
Strength Development ◽  
Interior Decoration ◽  
High Bond ◽  
High Bond Strength ◽  
Early Strength ◽  
Interface Treatment

In this paper, a new early strength tile adhesive is prepared by using α- high strength gypsum and its properties are discussed. The research methods refer to relevant Chinese standards. The results show that the tensile bond strength of the adhesive can reach 0.6 MPa in one day and 1.5 MPa in 7 days, which is close to 80% of 28-day strength. It is indicating that the adhesive has high bond strength, rapid strength development, and high dimensional stability. It effectively solves the problems that the traditional cement-based tile adhesive is prone to hollowing, falling off, and cracking. Additionally, no interface treatment is required during the using process of this gypsum-based adhesive.

Mechanical Strength and Resistance to Ultraviolet Radiation of Repairing Mortars Based on Epoxy Resin

2011 ◽  
Vol 391-392 ◽  
pp. 807-811
Author(s):  
Fang Liu ◽  
Zhi Bin Zhang ◽  
Ling Ling Xu ◽  
Ming Shu Tang
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Epoxy Resin ◽  
Cement Mortar ◽  
Light Radiation ◽  
Mortar Specimen ◽  
High Durability ◽  
High Bond ◽  
High Bond Strength ◽  
Peak Value

The epoxy resin based repairing material(REM) is suitable for repairing cracks and holes in concrete or broken concrete due to its high bond strength and high durability. The compressive strength and flexile strength are 76.4MPa and ＞12.5MPa at 28d, and the retest strength still remain 73.4MPa and ＞12.5MPa respectively. The fracture location of cement mortar specimen bonded by RME is at cement mortar, that is, the bond strength between REM and cement mortar is more than mortar itself. The compressive strength of RME keeps 93.3% under ultraviolet light radiation (Peak Value 308nm, 49.5 W/m2) for 1700h.

scholarly journals A Tough, Water-Resistant, High Bond Strength Adhesive Derived from Soybean Meal and Flexible Hyper-Branched Aminated Starch

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1352 ◽  
Author(s):  
Yi Zhang ◽  
Jieyu Zhang ◽  
Mingsong Chen ◽  
Jing Luo ◽  
Sheldon Q. Shi ◽  
...  
Keyword(s):  
Bond Strength ◽  
Soybean Meal ◽  
Water Resistance ◽  
Crosslinking Agent ◽  
Crosslinking Density ◽  
Chain Structure ◽  
High Bond ◽  
High Bond Strength ◽  
Branched Structure ◽  
Long Chain

Soybean meal (SM)-based adhesive exhibited a great potential to replace petroleum-derived ones to alleviate the energy crisis and eliminate carcinogenic formaldehyde. However, the bad water resistance (caused by low crosslinking density) and inherent brittleness of SM adhesive severely hindered its application. However, improving crosslinking density is generally accompanied by a toughness reduction of the adhesive. Herein, we developed a flexible long-chain starch with a hyper-branched structure (HD), and incorporated it with SM and a crosslinking agent to prepare a novel SM adhesive. Results showed that this adhesive exhibited both excellent water resistance and enhanced toughness. The wet bond strength of plywood fabricated using this adhesive was 354.5% higher than that of SM adhesive. These achievements are because introducing HD with hyper-branched groups enhanced crosslinking density, while HD’s flexible long-chain structure improved toughness of the adhesive. This HD can promote the development of tough and hydrophobic bio-based composites.

scholarly journals Adhesive bonding of resin cements to cast titanium with adhesive primers

2012 ◽  
Vol 23 (3) ◽  
pp. 218-222 ◽  
Author(s):  
Marina Di Francescantonio ◽  
Marcelo Tavares de Oliveira ◽  
Luiz Gustavo Dias Daroz ◽  
Guilherme Elias Pessanha Henriques ◽  
Marcelo Giannini
Keyword(s):  
Bond Strength ◽  
Titanium Surface ◽  
Adhesive Bonding ◽  
Resin Cement ◽  
Resin Cements ◽  
Relyx Unicem ◽  
Testing Data ◽  
High Bond ◽  
High Bond Strength ◽  
Post Hoc

The purpose of this study was to evaluate the effects of adhesive primer applications on the bond strength of resin cements to cast titanium. Four adhesive primers - Metaltite, Metal Primer II, Alloy Primer and Ceramic Primer - and their respective resin cements - Bistite II DC, Link Max, Panavia F 2.0, RelyX Unicem and RelyX ARC - were tested. Cast plates were prepared from titanium ingots (n=6 specimens/cement) and had their surfaces airborne-particle abraded with Al2O3 (50 μ m). Three resin cement cylinders were built on each bonded titanium surface, using a cylindrical translucent tubing mold and were subjected to micro-shear testing. Data were analyzed statistically by two-way ANOVA and Tukey's post-hoc test (α=0.05). The application of Metal Primer II and Ceramic Primer resulted in significant higher bond strength for Link Max and RelyX Unicem resin cements, respectively, than nonuse of adhesive primers. Panavia F 2.0 and RelyX ARC yielded high bond strength means with or without adhesive primers. The use of adhesive primers might increase the bond strength to cast titanium depending on the resin cement used.

Effect of Chlorhexidine Application Methods on Microtensile Bond Strength to Dentin in Class I Cavities

2010 ◽  
Vol 35 (6) ◽  
pp. 618-623 ◽  
Author(s):  
Y-E. Chang ◽  
D-H. Shin
Keyword(s):  
Clinical Practice ◽  
Phosphoric Acid ◽  
Bond Strength ◽  
Clinical Relevance ◽  
Class I ◽  
Microtensile Bond Strength ◽  
High Bond ◽  
High Bond Strength ◽  
Application Methods

Clinical Relevance In order to secure high bond strength in clinical practice, 2% chlorhexidine application after etching with 37% phosphoric acid is the recommended procedure.

scholarly journals Experimental Study of Post Installed Rebar Anchor Systems for Concrete Structure

2020 ◽  
Vol 16 (2) ◽  
pp. 308-319
Author(s):  
Haidar H. Haidar ◽  
Faten I. Mussa ◽  
Abbas O. Dawood ◽  
Ahmed A. Ghazi ◽  
Rassel A. Gabbar
Keyword(s):  
Experimental Study ◽  
Bond Strength ◽  
Hole Diameter ◽  
The Other ◽  
Bonding Agents ◽  
Pull Out ◽  
Varied Chemical ◽  
Anchor Systems ◽  
Cylindrical Samples ◽  
Concrete Interface

AbstractThis study investigated the effectiveness of several types of adhesives used in post-installed rebar connections as a bonding agent between steel reinforcement bars and old concrete under pull out test. The experimental samples were; cylindrical samples of (150 mm dia. × 300 mm high) with anchors rebar of varying diameter (12 and 16 mm), different embedded length (100 and 150) mm with different holes’ diameters. The strategy of control were cast-in-place rebar concrete specimens while other samples are post-installed rebar concrete specimens of varied chemical adhesives as bonding agents, namely KUT EPOXY ANCHOR ‘NS’ and SIKAFLOOR169. The output showed that the different adhesives yielded closed pull-out load values. It is found that the pull-out capacity (bond strength) is increased by increasing the embedded length, the diameter of the rebar and slightly with the diameter of the hole. In addition, the failure mode of post-installed rebar concrete was governed by the embedded length and the area of contact with the adhesives. On the other hand, the larger diameter of rebar favors splitting or failure of concrete due to higher strength in binder-rebar interface compare to the binder-concrete interface. The results showed that the pull-out load was increased by (26 % and 32 %) as the rebar diameter increased from 12 mm to 16 mm for KUT “NS” and SIKAFLOOR respectively. The hole diameter had slightly effect of the pull out load where the average of increment was only 6 %. Finally, the bonding strength is considerably depended on the embedded length and less affected by the type of epoxy.

Sign in / Sign up

Export Citation Format

Share Document