Ebrahim Sangsefidi

31 Questions 22 Answers 0 Followers

Questions related from Ebrahim Sangsefidi

Transverse Joint Configuration Reference for widening of flexible pavements?

I'm currently facing difficulty locating a reference for the transverse joint configuration for widening of a flexible pavement. From memory, I recall using a range of 300mm to 500mm for...

13 December 2023 1,371 4 View

Distribution of wheel wander within a lane?

I am currently working on a project that involves analysing and understanding the distribution of wheel wander within a lane. Specifically, I am interested in identifying the probable positions of...

04 October 2023 5,013 4 View

Does anybody know why people called "Scruffy Dome", scruffy?

10 July 2023 7,168 0 View

Can anybody help me with my XRD test results?

I have andesite source of road aggregates. I did XRD test on bulk powder and oriented samples ((1) air dried, (2) treated with ethylene glycol at 60oC, and (3) heat-treated at 550 oC for 45...

18 December 2018 9,408 2 View

Does anybody has any idea about the equation of the compaction curve of granular materials and how the Optimum Moisture Content can be calculated?

I mean after doing the compaction practice in various water contents and determining the dry density corresponding to each water content, what would be the equation of the resultant compaction...

04 November 2018 9,004 10 View

How can I recognize the weathering of the glass phase in my materials?

Could you please find the attached image and let me know if the presented data can show any weathering in the glass. Based on my understanding, the glass in the structure of my materials remained...

24 October 2018 4,773 1 View

Any advice how can I determine the proportion of Yellow-ish and Brown-ish color in a color photo?

A solution in MATLAB Software is preferred.

12 October 2018 3,660 2 View

In which condition should the California Bearing Ration be employed?

These are the questions I faced in my literature review I could not find an answer for them. Just for the record, I am going to do the CBR test on laboratory compacted base materials in the...

23 August 2018 5,897 8 View

How the composition of minerals in a thin section can be determined?

For example is there any way to recognize minerals (augite, plagioclase) as more sodic or calcic?

04 December 2017 2,811 49 View

What is the source of color, especially, yellow and red color, in weathered fine geomaterials?

From fine geomaterials, I mean those materials pass sieve 200. I know in the last cycle of weathering Hematite and Goethite may govern the color ranges, is there any other minerals in the middle...

25 May 2017 9,663 7 View

Is there any way to separate the fine aggregates passing sieve 200# in three parts (silt- Coarse clay and Fine clay) based on their size?

I do not want to change the chemical properties of fine materials.

27 October 2016 694 9 View

How can I determine the age of a rock?

24 October 2016 7,975 15 View

What kind of chemical bonds exists in rocks?

I mean, how do different kind of minerals in a special rock remain next to each other?

24 October 2016 3,293 9 View

Is there any way to determine the volume of cavities on the surface of a soil aggregate (especially coarse aggregates)?

I mean soil aggregates are porous materials per se, thus have some cavities on the surface. Depends on the presence of water they may partly or fully saturate with water. I want to determine the...

28 July 2016 6,384 2 View

Does Cation Exchange process has any effect on the formation secondary minerals?

05 July 2016 1,515 6 View

Which condition can accelerate the redox reaction in the soil?

Could you please introduce some reference which address this matter? Thanks in advance.

30 June 2016 4,817 3 View

Is there any idea, in which water content the pore pressure in the soil may occur as a result of external pressure?

I mean, is there any pore pressure while the soil is not saturated?

24 May 2016 8,370 4 View

Is there any significant chemical reaction in a compacted crushed granular material within 40 years?

When I say "significant chemical reaction", I mean those chemical reactions that alter the load bearing capacity of a compacted layer. Please assume that this layer is undergone 100 wetting and...

07 April 2016 8,894 4 View

Is there any correlation between exchangeable cations around the soil particle and the the strength of compacted soil against loading?

I know the exchangeable cations affect on the diffuse double layer thickness and also help the soil particle to aggregate and flocculate altogether. Is there any other correlation between the...

06 April 2016 3,198 3 View

How can I determine the kind of cations that occupy the exchangeable site of a soil particle?

I have two different soil and I want to determine the kind of cations (Al3+, Ca2+, Mg2+, K+ , Na+ , ...) reside on the exchangeable site of the soil particles.

06 April 2016 9,697 8 View

How can I increase the moisture in a compacted soil sample?

Please consider a specimen that is compacted in Optimum Moisture Content (OMC). I want to increase the moisture in this specimen so that the moisture distribute throughout of the specimen...

31 March 2016 728 6 View

Is there any way to connect the chemistry reaction in the solid and fluid phase of a soil to the soil strength?

Consider a situation that we laid two different soils as a foundation of a road (as a base courses). Both of them pass the initial criteria (for example the same compaction) and based on the...

31 March 2016 4,709 7 View

Is there any opinion about the chemistry reaction during Wetting and Drying process of a special soil?

I am mainly looking for the reaction that may affect the mechanical performance of the soil. Thanks

31 March 2016 9,361 4 View

What is the effect of anions on diffuse double layer thickness?

I know that cations play an important role in Diffuse Double Layer thickness. Furthermore, I know that the concentration of anion increases as the distance from aggregate increases. So, what is...

23 March 2016 2,425 1 View

How can water cause leaching of cations and anions (Ca2+ ...and Cl- ...) in a soil?

I know Cation Exchange Capacity is a methodology, but what about anions? Is there any other process that lead to leaching of cations and anions?

23 March 2016 3,349 2 View

What is the effect of (Fe2+ and Fe3+) and (Mn2+, Mn3+, Mn4+ and Mn5+) on the soil mechanical properties?

I mean what is the consequence of changing the amount of these ions (for any reason) in the soil (increase or decrease). In addition, I am eager to know that in what form these ions appear in the...

22 March 2016 195 3 View

Does anybody know why there is some aggregate gradation range for base and subbase material in all pavement specifications?

For example, AASHTO recommended six aggregate gradation range (A to F). How can a designer select a special range for a road base or subbase materials? How have these special ranges been...

12 February 2016 5,953 7 View

Can anybody introduce a reference for aging aggregate in unbound granular layer of pavement?

I know there is some test to assess asphalt aging in the pavement service life.

12 February 2016 4,849 5 View

How to model elastoplastic behavior of soils in ABAQUS?

I need to know how can I provide input parameter of ABAQUS for modeling viscoelastic behaviour of soils. Is there any laboratory test for this matter?

08 February 2016 584 1 View

Could anybody provide examples of separated cycleway designs implemented in front of emergency buildings, like fire stations or ambulance station?

Any standard, guideline, photo can help :)

01 January 1970 4,327 3 View

Wheel wander within a lane

I am currently working on a project that involves analysing and understanding the distribution of wheel wander within a lane. Specifically, I am interested in identifying the probable positions of...

01 January 1970 8,675 5 View