Evaluation of Babolsar Sand Behaviour by Using Static Triaxial Tests and Comparison with Case History

Salamatpoor, Sina; Salamatpoor, Siavash

doi:10.4236/ojce.2014.43016

Cited by 12 publications

(6 citation statements)

References 34 publications

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“…1, which shows that the soil can be classified as poorly graded sand (SP) based on Unified Soil Classification System (USCS) [20]. Table 1 shows the basic properties of this sand, its mineralogical composition, and its morphological characteristics [21,22]. Due to high level of underground water in Babolsar, portland cement type II has been utilized, which is appropriate for structures exposed to soil/water containing sulfate ions [23].…”

Section: Methodsmentioning

confidence: 99%

Load-settlement mechanism of strip footings rested on saturated loose sand and improved by zeolite–cement pads

Salamatpoor¹,

Salamatpoor²

2019

SN Appl. Sci.

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This study aims to investigate the performance of cemented sand pads after being incorporated with zeolite. Therefore, mechanical properties of the prepared zeolite-cemented sand pads were measured by a series of unconfined compressive strength (UCS) tests. Also, several small 1 g model tests were conducted to evaluate the behavior of shallow foundations rested on the prepared pads. The results demonstrated a remarkable increase in the UCS of the 14 and 28 days cured pads containing 40 wt% zeolite. In addition, incorporating 40 wt% zeolite into the cemented sand pads improved both their strength improvement ratio (SIR) and settlement reduction ratio (SRR). In particular, the SIR and SRR of the pads containing 40 wt% zeolite improved up to 323% and 86% respectively compared to that of the pristine cemented sand pads. As such, adding zeolite to the cemented sand is one of the most promising candidate to overcome the shortcomings of sandy soils in backfills, roadbeds, embankments, and etc. It is notable that this method taking the advantages of easy fabrication, low cost, and absence of environmentally deleterious wastes.

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Section: Methodsmentioning

confidence: 99%

Load-settlement mechanism of strip footings rested on saturated loose sand and improved by zeolite–cement pads

Salamatpoor¹,

Salamatpoor²

2019

SN Appl. Sci.

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“…The experimental results indicate that con ning pressure has an important in uence on the shear modulus of the tested samples and, by increasing mean con ning pressure, the e ect of relative density and initial stress anisotropy on the shear modulus increases. In addition, Salamatpoor and Salamatpoor [14] compared the liquefaction potential of the Babolsar sand with thirteen case histories using the concept of lique ed shear strength ratio. The results of these studies indicate that the Babolsar sand is potentially susceptible to signi cant strain softening due to monotonic and cyclic loads.…”

Section: Experimental Investigations 21 Materials Properties 211 mentioning

confidence: 99%

Improvement of shallow foundations rested on saturated loose sand by zeolite-cement mixture: a laboratory study

2018

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Improvement operation of sands is carried out frequently by cement together with several other additives. Common additives have high manufacturing cost and negative environmental impact during their manufacturing process and recycling in nature. Zeolite as a mineral substance for cement replacement can improve the strength parameter of a treated sand, without the negative de ciencies of the common additives. In this study, Uncon ned Compression Strength (UCS) and small-scale 1g model tests were conducted to evaluate the mechanical features of zeolite-treated sand and to study the behavior of shallow foundations resting on zeolite pad, respectively. The results of this study demonstrate that the UCS of the cemented sand samples increases when the cement is replaced by zeolite at an optimum proportion of 40% with curing times of 14 and 28 days. Adding this amount of zeolite to cemented sand mixture causes an increase in terms of the improvement rate between 40% and 125% and increases the Bearing Capacity Ratio (BCR) of the strip foundation treated by zeolite pad in the range of 11% to 420%. In addition, zeolite pad leads to a decline in the settlement of the treated strip footing from 16% to 86% in terms of the Settlement Reduction Ratio (SRR).

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“…Also, Salamatpoor and Salamatpoor [13] compared the liquefaction potential of the Babolsar sand with thirteen case histories, using the concept of liquefied shear strength ratio. The results of these studies indicate that the Babolsar sand is potentially susceptible to significant strain softening due to monotonic and cyclic loads.…”

Section: Sandmentioning

confidence: 99%

Mitigating the uneven settlement of nearby strip footings on loose saturated sand using concrete pedestals: a model test study

2018

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Adjacency and interfering of footings are a matter of importance in geotechnical engineering. Researchers have studied on the behavior of adjacent footings by several approaches, but the mechanism of such footings under unequal and non-simultaneous surcharges have not been explored to date. In this study, two series of experiments were conducted using small scale 1g models to investigate the behavior of the two adjacent footings under reinforced and unreinforced soil conditions. The footings were installed with different side-to-side spacing and placed on loose saturate sand. The ultimate bearing capacity, settlement, and tilting of footings are evaluated: (1) when the footings are rested on unreinforced sand; and, (2) when the soil underneath the new footing is reinforced by concrete pedestals. The results indicate that reinforcing the new footing by three concrete pedestals in the spacing to footing's width ratio (S/B) of 0 (i.e., two coherent footings) results in 67% increase of the bearing capacity of the new footing compared to that of the unreinforced condition. Also, the settlement and tilting of the old footing adjacent to the new footing decrease respectively up to 250% and 600% in comparison to those of the unreinforced condition. The proposed measure can be considered as an effective improvement technique on the performance of the nearby footings rested on soft granular soils.

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Evaluation of Babolsar Sand Behaviour by Using Static Triaxial Tests and Comparison with Case History

Cited by 12 publications

References 34 publications

Load-settlement mechanism of strip footings rested on saturated loose sand and improved by zeolite–cement pads

Load-settlement mechanism of strip footings rested on saturated loose sand and improved by zeolite–cement pads

Improvement of shallow foundations rested on saturated loose sand by zeolite-cement mixture: a laboratory study

Mitigating the uneven settlement of nearby strip footings on loose saturated sand using concrete pedestals: a model test study

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