scholarly journals Effect of Roughness on Shear Characteristics of the Interface between Silty Clay and Concrete

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yonghong Wang ◽  
Xueying Liu ◽  
Mingyi Zhang ◽  
Xiaoyu Bai
Keyword(s):  
Shear Strength ◽  
Shear Stiffness ◽  
Test System ◽  
Engineering Practice ◽  
Silty Clay ◽  
Interface Pressure ◽  
Interface Shear ◽  
Piezoresistive Sensor ◽  
Shear Characteristics ◽  
Concrete Interface

In order to study the effect of roughness on the mechanical parameters of silty clay-concrete interface, and to explore the applicability of silicon piezoresistive sensor to test the interface pressure, a large-scale direct shear test system was used to carry out experimental research on the shear characteristics of silty clay-concrete interface under different roughness conditions. Based on silicon piezoresistive sensor, the shear characteristics of silty clay-concrete interface are analyzed. The results show that the silicon piezoresistive sensor has excellent performance in measuring the interface pressure and can accurately obtain the shear characteristics of the silty clay-concrete interface. The roughness has a significant influence on the shear strength, shear stiffness, and other mechanical properties of the prefabricated pile-soil interface. With the increase of roughness, interface shear strength, interface friction angle, shear stiffness coefficient, and interface residual shear stress all show an increasing trend, with the maximum increase of 37.0%. The interface adhesion decreased first and then increased with the increase of roughness, with an increase of 23.7%. The test results can provide reference for the engineering practice of jacked pile.

Evaluation of soil-concrete interface shear strength based on LS-SVM

2016 ◽  
Vol 11 (3) ◽  
pp. 361-372 ◽  
Author(s):  
Chunshun Zhang ◽  
Jian Ji ◽  
Yilin Gui ◽  
Jayantha Kodikara ◽  
Sheng-Qi Yang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Strength Based ◽  
Concrete Interface

scholarly journals Shear Characteristics of the Interface between Recycled Concrete Aggregates and Various Geosynthetics

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jian-Qi Wu ◽  
Lei Li ◽  
Guo-Hui Yuan ◽  
Bin Wu ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Glass Fiber ◽  
Large Scale ◽  
Particle Diameter ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Aperture Size ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Shear Characteristics

To investigate the interface shear characteristics between various geosynthetics and recycled concrete aggregate (RCA), 30 large-scale monotonic direct shear tests were conducted. The main work was to analyse the effect of a biaxial polypropylene geogrid, a glass fiber geogrid, a warp-knitted polyester geogrid, a woven geotextile, and geonet on the interface shear properties of RCA. The test results show that adding a biaxial polypropylene geogrid or a geonet to RCA can improve its interface shear strength. The inclusion of glass fiber geogrids, warp-knitted polyester geogrids, and woven geotextiles decrease the interface shear strength of RCA. The reinforcing RCA with geosynthetics can effectively suppress its shear dilation, and the change in internal friction angle is consistent with the change law of the material interface enhancement coefficient. Finally, the aperture size of a geogrid has a significant effect on the mechanical properties of the geogrid-RCA interface. The interface shear strength increases first and then decreases with an increase in the ratio between aperture size and median particle diameter. It is concluded that there is an optimal range of aperture ratio between a geogrid and RCA.

Thermomechanical properties of sand–structure interface using temperature-controlled triaxial instrument

2020 ◽  
pp. 1-13
Author(s):  
Chunhong Li ◽  
Gangqiang Kong ◽  
Xinrui Zhang ◽  
Hanlong Liu ◽  
Lehua Wang
Keyword(s):  
Shear Strength ◽  
Thermomechanical Properties ◽  
Test System ◽  
Effect Of Temperature ◽  
Excess Pore Pressure ◽  
Vertical Force ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Load Paths ◽  
Temperature Controlled

To study the effect of temperature on the mechanical properties of a sand–structure interface, a temperature-controlled interface shear test system based on a triaxial instrument was developed by placing a cylindrical structure inside a triaxial soil sample and connecting them to two individual thermostat water baths. Sand–aluminum interface shear tests under effective cell pressures of 50, 100, and 200 kPa and temperatures of 6, 19, 32, and 45 °C were carried out to evaluate the thermal effects on the interface strength under drained conditions. Constant vertical force–stiffness coupled with a thermal load applied to the aluminum top before the interface shearing was also considered. The results show that the new apparatus can serve a variety of thermomechanical load paths, including maintaining a constant rate of displacement and a constant vertical force–stiffness on the structure top prior to the shearing process. The apparatus also has advantages over other interface shear devices in controlling drainage conditions and measurement of volume change and excess pore pressure. A comparison with the previous literature on interface shear strength verifies the results in this study. Different thermomechanical load paths applied on the interface supplement the insignificant thermal effect on the sand–aluminum interface shear strength. However, it is the first time that the displacement of the aluminum is observed to be related to thermal variations and independent of the magnitude of the vertical force.

scholarly journals Asperities effect on polypropylene & polyester geotextile-geomembrane interface shear behaviour

2019 ◽  
Vol 92 ◽  
pp. 13017
Author(s):  
Daniel Adeleke ◽  
Denis Kalumba ◽  
Johnny Oriokot
Keyword(s):  
Shear Strength ◽  
Engineering Application ◽  
Friction Angle ◽  
Strength Properties ◽  
Shear Behaviour ◽  
Percentage Increase ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Direct Shear Tests ◽  
Shear Characteristics

The summary of this paper is focused on the result of a study that used quantitative measures of surface texture as the basis for examining the effects of asperities on the shear characteristics of geotextile-geomembrane interfaces. About 30 large direct shear tests were conducted to evaluate the geotextile-geomembrane interface shear strength properties. The results indicated a non-linear failure envelopes and strain softening behaviour at a normal stress range of 50 – 400 kPa. For most interface tested, the polyester-geotextiles resulted in higher shear strength as compared with polypropylene-geotextiles. Also, the polyester and polypropylene geotextile interface with the high asperity geomembrane produces a similar percentage increase in friction angle at the residual state. For textured geomembranes interfaced with both geotextile, polyester geotextile exhibited relatively less time before failure. Also, asperity height has a more pronounced effect than asperity density on the residual interface shear strength. The outcome of this study would provide a recommendation and guide that can lead to an improved basis for geosynthetics selection in various engineering application.

scholarly journals Shear Strength Behavior of Crude Oil Contaminated Sand-Concrete Interface

2016 ◽  
Vol 2 (8) ◽  
pp. 365-374
Author(s):  
Amir Hossein Mohammadi ◽  
Taghi Ebadi ◽  
Mehrdad Ahmadi ◽  
Arash Aliasghar
Keyword(s):  
Shear Strength ◽  
Crude Oil ◽  
Oil Content ◽  
Friction Angle ◽  
Concrete Surface ◽  
Interface Roughness ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Oil Concentration ◽  
Concrete Interface

A laboratory investigation into crude oil contaminated sand-concrete interface behavior is performed. The interface tests were carried out through a direct shear apparatus. Pure sand and sand-bentonite mixture with different crude oil contents and three concrete surfaces of different textures (smooth, semi-rough, and rough) were examined. The experimental results showed that the concrete surface texture is an effective factor in soil-concrete interface shear strength. The interface shear strength of the rough concrete surface was found higher than smooth and semi-rough concrete surfaces. In addition to the texture, the normal stress and the crude oil content also play important roles in interface shear strength. Moreover, the friction angle decreases with increasing crude oil content due to increase of oil concentration in soil and it increases with increasing interface roughness.

scholarly journals Sand- and Clay-Photocured-Geomembrane Interface Shear Characteristics Using Direct Shear Test

2021 ◽  
Vol 13 (15) ◽  
pp. 8201
Author(s):  
Lihua Li ◽  
Han Yan ◽  
Henglin Xiao ◽  
Wentao Li ◽  
Zhangshuai Geng
Keyword(s):  
Soil Surface ◽  
Friction Angle ◽  
Direct Shear ◽  
Tensile Crack ◽  
Shear Tests ◽  
Interface Shear ◽  
Direct Shear Tests ◽  
Carbon Black Powder ◽  
Shear Characteristics ◽  
Impermeable Layer

It is well known that geomembranes frequently and easily fail at the seams, which has been a ubiquitous problem in various applications. To avoid the failure of geomembrane at the seams, photocuring was carried out with 1~5% photoinitiator and 2% carbon black powder. This geomembrane can be sprayed and cured on the soil surface. The obtained geomembrane was then used as a barrier, separator, or reinforcement. In this study, the direct shear tests were carried out with the aim to investigate the interfacial characteristics of photocured geomembrane–clay/sand. The results show that a 2% photoinitiator has a significant effect on the impermeable layer for the photocured geomembrane–clay interface. As for the photocured geomembrane–sand interface, it is reasonable to choose a geomembrane made from a 4% photoinitiator at the boundary of the drainage layer and the impermeable layer in the landfill. In the cover system, it is reasonable to choose a 5% photoinitiator geomembrane. Moreover, as for the interface between the photocurable geomembrane and clay/sand, the friction coefficient increases initially and decreases afterward with the increase of normal stress. Furthermore, the friction angle of the interface between photocurable geomembrane and sand is larger than that of the photocurable geomembrane–clay interface. In other words, the interface between photocurable geomembrane and sand has better shear and tensile crack resistance.

Influence of revision arthroplasty on bone/cement interface shear strength

1987 ◽  
Vol 20 (8) ◽  
pp. 824
Author(s):  
J.E. Bechtold ◽  
Y. Dohmae ◽  
R.E. Sherman ◽  
R.B. Gustilo
Keyword(s):  
Shear Strength ◽  
Bone Cement ◽  
Revision Arthroplasty ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Cement Interface

scholarly journals Skewness and Kurtosis: Important Parameters in the Characterization of Dental Implant Surface Roughness—A Computer Simulation

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Karl Niklas Hansson ◽  
Stig Hansson
Keyword(s):  
Surface Roughness ◽  
Shear Strength ◽  
Roughness Parameter ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Implant Surface ◽  
Bone Response ◽  
Dental Implant Surface ◽  
Skewness And Kurtosis

The surface roughness affects the bone response to dental implants. A primary aim of the roughness is to increase the bone-implant interface shear strength. Surface roughness is generally characterized by means of surface roughness parameters. It was demonstrated that the normally used parameters cannot discriminate between surfaces expected to give a high interface shear strength from surfaces expected to give a low interface shear strength. It was further demonstrated that the skewness parameter can do this discrimination. A problem with this parameter is that it is sensitive to isolated peaks and valleys. Another roughness parameter which on theoretical grounds can be supposed to give valuable information on the quality of a rough surface is kurtosis. This parameter is also sensitive to isolated peaks and valleys. An implant surface was assumed to have a fairly well-defined and homogenous “semiperiodic” surface roughness upon which isolated peaks were superimposed. In a computerized simulation, it was demonstrated that by using small sampling lengths during measurement, it should be possible to get accurate values of the skewness and kurtosis parameters.

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