Behavior of EPS geofoam in stress-controlled cyclic uniaxial tests

Trandafir, Aurelian C.; Bartlett, Steven F.; Lingwall, Bret N.

doi:10.1016/j.geotexmem.2010.01.002

Cited by 48 publications

(16 citation statements)

References 20 publications

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“…It is made of expanded styrene formed through the process of expansion using pentane and steam [152]. The mechanical [153] and dynamic properties [154] of geofoam blocks were investigated in detail. The EPS' light strength properties between surfaces were also investigated and found to be significant across two surfaces of the block [155].…”

Section: Geofoam As Lightweight Fill Materialsmentioning

confidence: 99%

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mamat

Kasa

Razali

2019

IIUMEJ

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This paper presents an exhaustive review of the challenges faced in the construction of road embankments on soft ground and proposes a direction for future development. Frequently used techniques for soft ground improvement are discussed. The factors that contribute to the stability of the road embankment are reviewed by approach, results of past studies, and historical cases. The findings show that settlement, slope stability, and soil bearing capacity are all challenges to constructing the road embankment. Additionally, it is found that geometric data is a key factor in embankment design. Pre-loading with prefabricated vertical drain (PVDs) methods and lightweight fill were found to be widely used techniques in soft ground improvement. The information from this study can be used to develop design guidance systems, numerical modelling, and to give an overview and knowledge to other researchers who are or will conduct research in this field. Finally, future perspectives for research are related to predictions of factors that affect the stability of road embankment with an artificial intelligence approach. ABSTRAK: Kertas ini membentangkan ulasan kajian menyeluruh mengenai cabaran yang dihadapi dalam pembinaan benteng jalanraya di atas tanah lembut dan mencadangkan ke arah pembangunan kajian masa depan. Teknik-teknik penambahbaikan tanah lembut yang sering digunakan turut dibincangkan. Faktor- faktor yang menyumbang kepada kestabilan benteng jalanraya diulas dengan pendekatan kepada kajian lepas dan sejarah kes. Hasil kajian ini didapati bahawa enapan, kestabilan cerun dan keupayaan galas tanah merupakan cabaran dalam pembinaan benteng jalanraya. Selain itu, ia didapati bahawa data geometri merupakan faktor penting kepada rekabentuk benteng. Kaedah pra pembebanan dengan prefabrikasi saliran menegak (PVDs) dan isian ringan didapati teknik yang popular digunakan dalam pembaikkan tanah lembut masa kini. Maklumat dari kajian ini boleh digunakan untuk membangunkan sistem panduan reka bentuk, pemodelan berangka serta memberi gambaran dan ilmu kepada penyelidik lain yang sedang atau akan menjalankan kajian dalam bidang ini. Akhir sekali, perspektif masa depan untuk penyelidikan berkaitan ramalan faktor-faktor yang mempengaruhi kestabilan embankment jalanraya dengan pendekatan kepintaran buatan.

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Section: Geofoam As Lightweight Fill Materialsmentioning

confidence: 99%

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mamat

Kasa

Razali

2019

IIUMEJ

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“…This means that such material is more suitable in all structural details where the presence of moisture can be expected. Research into the mechanical characteristics of EPS has shown that it maintains its strength and stiffness also if it is in constant contact with water [22][23][24]. However, it has been shown that its thermal conductivity might increase if it is not additionally protected by a waterproofing layer.…”

Section: Materials For Thermal Insulation Boardsmentioning

confidence: 99%

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Koren¹,

Kilar²,

Azinović³

2016

Insulation Materials in Context of Sustainability

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In recent years, there has been a significant increase in the construction of energyefficient buildings. These buildings are mainly characterized by their thermal envelope, which needs to follow the complete outer perimeter of the building without any interruptions, to avoid thermal bridges. It has been observed, however, that the specific new details which prevent the occurrence of thermal bridges can, in many cases, substantially affect the structural integrity of such buildings during earthquakes. This chapter deals with the seismic aspects of the application of thermal insulation (TI) boards beneath the foundations of buildings. For this purpose, the mechanical characteristics of the most commonly used material in practice (i.e., extruded polystyrene-XPS) were experimentally determined. Additionally, the shear behaviour of differently composed TI foundation sets was investigated and their friction capacity estimated. The authors have proposed a new solution for the foundation detail, which is based on controlling the sliding mechanism between the individual layers of TI boards in order to reduce the seismic forces induced on the superstructure. The proposed detail with a specially designed sliding layer surface is made of commonly used TI materials for modern passive houses, thus reducing the potential additional costs. The solution was verified by means of nonlinear dynamic analysis of several realistic building models and various friction coefficients between XPS boards. The selected results are presented in terms of fragility curves for the occurrence of sliding between the layers of XPS boards. Based on these curves, the desired seismic response scenario and level of protection of a building structure could be selected.

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“…e shear stress attenuated more rapidly with the depth [13]. e damage caused by dynamic loading could be effectively reduced by LCES [14]. Data from stress-controlled cyclic uniaxial tests showed a logarithmic decrease in the damping ratio of EPS geofoam with the increasing axial strain amplitude.…”

Section: Introductionmentioning

confidence: 96%

Deformation and Damping Characteristics of Lightweight Clay‐EPS Soil under Cyclic Loading

Zhou

et al. 2018

Advances in Civil Engineering

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Lightweight Clay-EPS Soil (LCES) is a newly developed material which has many merits such as the adjustability of strength and density, simplicity for construction, and economical efficiency. It has been widely applied in practical engineering, e.g., soft ground improvement, the solvent of bridge head jump, earthfill of pipeline, and broadening of highway. Meanwhile, construction castoff and industrial waste can be recycled as a major ingredient in LCES. The dynamic deformation characteristics of LCES and clay were comprehensively studied using laboratory dynamic triaxial tests. It was found that the compressive strain of LCES increased while the growth rate of strain decreased with the increasing number of cycles, which conformed to a hyperbola model. The dynamic secant elastic modulus of LCES decreased with the increase of dynamic strain, which was represented by strain softening. The dynamic modulus of clay decreased sharply, while that of LCES decreased marginally. Moreover, the damping ratio of LCES tended to increase with the increasing dynamic strain. The damping ratio of LCES was lower than that of clay at the same strain level. It was also found that cement content had a negative relationship with the damping ratio of LCES, while the effect of EPS beads content was adverse. The damping ratio of both LCES and clay decreased moderately.

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Behavior of EPS geofoam in stress-controlled cyclic uniaxial tests

Cited by 48 publications

References 20 publications

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Deformation and Damping Characteristics of Lightweight Clay‐EPS Soil under Cyclic Loading

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