Reinforcement effect of geotextiles on shear strength of peat soil: a case study on Urmia peat

Peat soils have been known for their problematic characteristics which include high water content, high compressibility and low shear strength. In this study, an attempt was made to investigate the effect of 1 week addition of modified Urea-CaCl2liquid medium with and withoutSporosarcina pasteuriion the shear strength of unsterilized dried peat soil using the Unconfined Compression Test. After the treatment period, significant increase in the shear strength of the soil was found to be highest for peat + medium at 42 kN/m2, moderate for peat + medium +Sporosarcina pasteuriiat 27 kN/m2and unchanged for peat + water control at 24 kN/m2. Although the growth dynamics of all the microbes involved in the calcite formation in the treated peat soil were not known, the addition of the modified Urea-CaCl2liquid medium into the soil clearly had contributed to the marked increased in the shear strength of the soil. It is probable that the medium had promoted a better growth of indigenous calcite bacteria population in the soil which may have been suppressed by the slow growingS. pasteuriipopulation being added daily to the soil

Download Full-text

Shear strength of hot-mix asphalt and its relation to near-surface pavement failure – A case study in Southern

Proceedings of 6th Eurasphalt & Eurobitume Congress ◽

10.14311/ee.2016.240 ◽

2016 ◽

Cited By ~ 1

Author(s):

Joao Rodrigo Mattos ◽

Washington Peres Núnez ◽

Jorge Augusto Ceratti ◽

André Zíngano ◽

William Fedrigo

Keyword(s):

Shear Strength ◽

Hot Mix Asphalt ◽

Near Surface

Download Full-text

Case Study of Strength Calculation and the Possible Repair Options for Screw Thread Damages

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.39177 ◽

2021 ◽

Vol 9 (11) ◽

pp. 2044-2054

Author(s):

Chandrasekhar Narahari

Keyword(s):

Shear Strength ◽

Design Criteria ◽

Screw Thread ◽

Mechanical Assembly ◽

Bearing Strength ◽

Industry Standard ◽

Margin Of Safety ◽

Thread Strength ◽

Repair Techniques

Abstract: Thread Strength and repair capability are critical to successful screw joints for any mechanical assembly. This paper explores the effect of the thread damage utilizing hand calculations, the margin of safety (MOS) for internal & external threads and compares with the required design criteria limit. Hence, the reduction in thread capability is analyzed in terms of shear and bearing strength of threads. This paper also emphasizes the Industry-standard repair techniques such as Helical inserts, Oversize inserts, and Twinserts with limitations and expected process/techniques. Advanced thread repairs in the market such as solid-body thread inserts (key-style, Time-sert, Big-sert) are also discussed Keywords: Thread damages, Shear strength, bearing strength. STI (Screw thread insert)

Download Full-text

Measurement of Peat Soil Shear Strength Using Wenner Four-Point Probes and Vane Shear Strength Methods

International Journal of Geophysics ◽

10.1155/2019/3909032 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Irfan Ahmad Afip ◽

Siti Noor Linda Taib ◽

Kamaruzaman Jusoff ◽

Liyana Ahmad Afip

Keyword(s):

Shear Strength ◽

Moisture Content ◽

Soil Salinity ◽

Peat Soil ◽

Undrained Shear Strength ◽

Soil Resistivity ◽

In Situ Test ◽

Soil Shear Strength ◽

The Relationship

The general objective of this research was to measure the peat soil shear strength using Wenner four-point probes and vane shear strength methods. Specifically, the objective of this study was two-fold, namely, (a) investigating the relationship between laboratory soil resistivity and undrained shear strength and (b) determineing the relationship between in-situ soil resistivity and undrained shear strength. Data were randomly collected over six locations in Meranek, Sarawak, for in-situ test and three repetitions for each data were set based on three parameters. The selected parameters were soil density, moisture content, and salinity for both laboratory and in-situ test using Wenner four-point probes and vane shear method. The soil resistivity and vane shear strength readings for laboratory test were correlated with soil salinity, moisture content, and density. The R2 values showed a good correlation for soil salinity (R2 =0.8468) and density (R2 =0.9475), respectively. However, a weak correlation of R2 =0.1205 was observed for soil moisture. The R2 value for in-situ correlation between soil resistivity and three parameters (soil salinity, moisture content, and density) was R2 =0.8916. It can be concluded that the peat soil shear strengths of the study area using Wenner four-point probes from in-situ were (4.38 ohm.m) and laboratory was (2.47 ohm.m) and when using the vane shear strength method, in-situ was (23 kPA) and laboratory was (5 kPA). This study implies that the peat soil of the study area can be categorized as texture (soft loamy soil) and it is suitable for agriculture instead of construction. The relationship established between Wenner four-point probes and vane shear method can be beneficial for ground engineering design to enhance investigation on site suitability. Future work on DUALEM-421 technique should be emphasised for better subsurface exploration accuracy and resolve peat depth for an in-situ test.

Download Full-text

Research on Field vane Shear Strength of Marsh Peat Soil in South America

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/780/4/042016 ◽

2020 ◽

Vol 780 ◽

pp. 042016

Author(s):

Ruiqi Zhang ◽

Yuntao Chen ◽

Shengli Zhu

Keyword(s):

Shear Strength ◽

South America ◽

Peat Soil

Download Full-text

Influences of Interface Properties on the Performance of Fiber-Reinforced Asphalt Binder

Polymers ◽

10.3390/polym11030542 ◽

2019 ◽

Vol 11 (3) ◽

pp. 542 ◽

Cited By ~ 12

Author(s):

Yinghao Miao ◽

Ting Wang ◽

Linbing Wang

Keyword(s):

Shear Strength ◽

Surface Energy ◽

Asphalt Binder ◽

Basalt Fiber ◽

Fiber Reinforcement ◽

Fiber Reinforced ◽

Reinforcement Effect ◽

Modified Asphalt ◽

Asphalt Rubber ◽

Sbs Modified Asphalt

This paper presents an experimental study about the influence of interfacial properties on the performance of fiber-reinforced asphalt. In this study, four types of fiber including one fiber-reinforced plastic (FRP), two lignin fibers, and one basalt fiber are used, and also four types of asphalt: Asphalt No. 90, asphalt No. 70, one styrene-butadiene-styrene (SBS) modified asphalt, and asphalt rubber are used. The surface energy parameters of various asphalts and fibers and the shear strength of various fiber-reinforced asphalts are measured. On the basis of these measurements, the influences of surface properties of asphalt and fiber on the performance of fiber-reinforced asphalt are analyzed. The results show that the shear strength of asphalt binder can be significantly increased by adding fibers, and the reinforcement effect is closely related to the types of asphalt and fiber. It was discovered, for the same asphalt, that the basalt fiber has the best reinforcement effect, followed by the two lignin fibers, and the FRP. For the same fiber, asphalt rubber was the most reinforced, followed by the SBS modified asphalt, asphalt No. 70 and asphalt No. 90. It was also discovered, for the same asphalt, the higher the surface energy of the fiber, the better the fiber reinforcement effect. The analysis indicates a good correlation between the work of adhesion between asphalt and fiber and the effect of fiber reinforcement. The results can be used as a basis for the selection of the proper fiber-asphalt combination to improve fiber reinforcement effects.

Download Full-text