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Defining geotechnical parameters for surface-laid subsea pipe-soil interaction
Published in Michael A. Hicks, Federico Pisanò, Joek Peuchen, Cone Penetration Testing 2018, 2018
Table 1 shows that values for su,r and γ’ can be broadly derived from CPT parameters. Particularly, su,r can be correlated to fs,CPT (e.g. Quiros & Young 1988), at high precision but limited accuracy. Figure 1 shows reasonable correlation for su,rMV ∼ 1.0 fs,CPT. Correlations between fs,CPT and su,r should consider: (a) cone penetrometer type, (b) a reference test method for su,r, and (c) soil behaviour type including range of soil strength or overconsolidation ratio OCR. It is noted that fs,CPT is probably more related to residual strength than remoulded strength. Furthermore fs,CPT can be dominated by soil-soil shear resistance at low OCR values and by soil-steel resistance at high OCR values.
Index Strength Tests and Sensitivity
Published in Alan J. Lutenegger, Laboratory Manual for Geotechnical Characterization of Fine-Grained Soils, 2023
One problem with the Pocket Penetrometer is that in very hard soils, the device will reach a limiting value without penetrating the required 0.5 in. In this case, the results are reported as > 4.5 kg/cm2 (tsf). The author has fabricated an attachment with a smaller size foot for use in very stiff clays, such as glacial tills, shown in Figure 24.6. The small foot has an area half that of the standard penetrometer end. This means that the number obtained from the pocket penetrometer scale should be multiplied by two when using the small foot.
Researches of structural-mechanical properties of coal tailings as disperse systems
Published in Genadiy Pivnyak, Volodymyr Bondarenko, Iryna Kovalevs’ka, Mykhaylo Illiashov, Mining of Mineral Deposits, 2013
Penetrometer – the device for measurement of a consistence of semi-fluid materials by determination of depth of penetration of a test body of the standard sizes and weight on the tested environment. Measures penetration number – an indicator characterizing rheological properties of substances which is equal to depth of immersion of a working body penetrometer in terms of the tenth shares of millimeter. For example, if the working body penetrometer plunged on 20 mm, the number of a penetration will be equal 200.
Constitutive model for predicting stress-strain behavior of fine-grained sediments using shear-wave velocity
Published in Marine Georesources & Geotechnology, 2020
Wisam R. Muttashar, L. Sebastian Bryson
The developed CSSM framework was applied to field data from a coastal site to evaluate the utility of the methodology for field applications. Estimating the shear strength and the stress-strain behavior of coastal deposits is the subject of several marine geotechnology studies (Singh and Chung 2013; Yin et al. 2015). For the evaluation, field data were obtained from a study investigating the effects of pile installation on the static and dynamic properties of the San Francisco Young Bay Mud (Hunt et al. 2000). The data included shear-waves velocity measurements, material properties, and seismic cone penetrometer measurement with pore pressure (SCPT-U). The study evaluated site conditions prior to pile installation (noted as pre-pile) and at several intervals after installation (noted as post-pile). The study also included constant rate of strain (CRS) consolidation tests and consolidated undrained (CU) triaxial compression tests performed on undisturbed samples obtained pre-pile and post-pile installation. The reported laboratory test results were used to evaluate the methodology proposed herein.
Modified bitumen emulsion by anionic polyurethane dispersion nanocomposites
Published in Road Materials and Pavement Design, 2020
Behzad Shirkavand Hadavand, Behzad Ghobadi Jola, Khadijeh Didehban, Ahmad Mirshokraie
Particle size distributions were determined by Malvern particle size analyser Master sizer 2000 model (UK). Automatic bitumen dial penetrometer model BI 120 according to ASTM D5, ISIRI 2950 Standard and ring and ball apparatus model BI 130 according to ASTM D36, ISIRI 2951 standard were used for determining penetration and softening point of bitumen, respectively. Ultrasound Hielscher (model UP400S; Germany) and homogeniser HG-15D (Wisd Laboratory Instruments, South Korea) were used for dispersing nanoclay in PUD and nanocomposites in bitumen emulsion. For studying rheological properties and viscosity, rheometer Anton Paar MCR300 device cylindrical TEZ180-C systems (Austria), shear rate 0.01–1000 1/s, angular frequency 500–0.1 rad/s, γ was 10% and 20°C and 80°C temperature range was used.
Investigating bitumen’s direct interaction with Tetradecane as potential phase change material for low temperature applications
Published in Road Materials and Pavement Design, 2020
Muhammad Rafiq Kakar, Zakariaa Refaa, Moises Bueno, Jörg Worlitschek, Anastasia Stamatiou, Manfred N. Partl
The results of bitumen penetration test are illustrated in Figure 1(A). No significant effects on penetration grade of bitumen 10/20 were observed after adding 1% Tetradecane. However, the penetration grade was altered when bitumen was modified with 5% and 10% PCM. It was noticed that bitumen becomes relatively soft when Tetradecane is added directly in concentrations of 1%, 5% and 10%. The soft bitumen 160/220 could not be modified with 10% PCM which resulted in bitumen flowing at room temperature; even after adding of 5% Tetradecane, the penetration results exceeded the maximum limits of the Penetrometer reading range. Similar behaviour was noticed for bitumen 70/100 when modified with 10% Tetradecane.