Dr. SaMeH S. Ahmed

Associate Prof. of Environmental Engineering

Changes of specifi


Changes of specific weight

Unlike density, specific weight is not absolute. It depends upon the value of the gravitational acceleration, which varies with location. A significant influence upon the value of specific gravity is the temperature of the material. Pressure may also affect values, depending upon the bulk modulus of the material, but generally, at moderate pressures, has a less significant effect than the other factors. [2]

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Uses

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Fluid mechanics

In fluid mechanics, specific weight represents the force exerted by gravity on a unit volume of a fluid. For this reason, units are expressed as force per unit volume (e.g., lb/ft3 or N/m3). Specific weight can be used as a characteristic property of a fluid. [2]

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Soil mechanics

Specific weight is used as a property of soil often used to solve earthwork problems.

In soil mechanics, specific weight may refer to:

  • Moist unit weight, which is the unit weight of a soil when void spaces of the soil contain both water and air.
gamma = frac{(1+w)G_sgamma_w}{1+e}

where

gamma is the moist unit weight of the material
gamma_w is the unit weight of water
w is the moisture content of the material
Gs is the specific gravity of the solid
e is the void ratio
  • Dry unit weight, which is the unit weight of a soil when all void spaces of the soil are completely filled with air, with no water.

The formula for dry unit weight is:

gamma_d = frac{G_sgamma_w}{1+e} = frac{gamma}{1+w}

where

gamma is the moist unit weight of the material
gamma_d is the dry unit weight of the material
gamma_w is the unit weight of water
w is the moisture content of the material
Gs is the specific gravity of the solid
e is the void ratio
  • Saturated unit weight, which is the unit weight of a soil when all void spaces of the soil are completely filled with water, with no air.

The formula for saturated unit weight is:

gamma_s = frac{(G_s+e)gamma_w}{1+e}

where

gamma_s is the saturated unit weight of the material
gamma_w is the unit weight of water
w is the moisture content of the material
Gs is the specific gravity of the solid
e is the void ratio[3]

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Mechanical engineering

Specific weight can be used in mechanical engineering to determine the weight of a structure designed to carry certain loads while remaining intact and remaining within limits regarding deformation.

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Mining Engineering

Mining engineering is an engineering discipline that involves practice, theory, science, technology, and the application of extracting and processing minerals from a naturally occurring environment. Mining engineering also includes processing minerals for additional value.

Environmental Engineering

Environmental engineers are the technical professionals who identify and design solutions for    environmental problems. Environmental engineers provide safe drinking water, treat and properly dispose of wastes, maintain air quality, control water pollution, and remediate sites contaminated due to spills or improper disposal of hazardous substances. They monitor the quality of the air, water, and land. And, they develop new and improved means to protect the environment.

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Univeristies

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Assuit University (Home University), Egypt


Imperial College, London, UK


Faculty of Engineering, Al-Mergeb University, Libya


King Saud University, KSA

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Course 2016/17-1


  1. Computer Applications in Surveying  CE 473
  2. Surveying 1 CE 370
  3. Photogrammetry CE 474
  4. Surveying II  CE 371
  5. Design I  (round 4) CE 498




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Member of the Editorial Board: " Journal of Water Resources and Ocean Sciences"  2013

https://www.researchgate.net/profile/Sameh_Ahmed5/?ev=hdr_xprf

Participating in The Third International Conference on Water, Energy and Environment,(ICWEE) 2015 - American University of Sharjah, UAE 24-26 March 2015 with a Paper and Poster

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Recovery of Titania from Waste-Sludge of Majmaah Water Treatment Plant

"Production of Titania Nano-particles from Wast-

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Results of M2 CE311

Student Conference

Participation  in the 6Th Student Conference

With a paper and oral presentation

From the Senior Design Project CE499 -35

See inside, the paper, and presentation

CE 370 Course

Surveying  I -  CE 370 - 2016-2017-1




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Lecture notes


Second Midterm Exam



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CE 371 Course

Surveying II - CE 371 - 2016-2017-1




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First midterm exam


Lab


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CE473 Course

Computer Applications in Surveying

CE 473



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CE 474 Course

2015-2016-2 - Photogrammetry  CE474




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Report 1  Cameras Report

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60 marks Exams

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CE 360 Course

Environmental Engineering 1



CE 360: Environmental Engineering 1

37-2

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Water quality Poster + Climate Change Reports
will be announced (Quiz #2 will be using D2L- Online Quizzes

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GE 306 Course

Engineering Report Writing


GE 306: Engineering Report Writing

CE 499 Course

Senior Design 2 - CE 499

Meeting on 14-4-2015

Second Best paper from Senior Design Projects in 2015

Paper title:

Evaluation of Groundwater Quality Parameters using Multivariate Statistics- a case Study of Majmaah, KSA

Students:

Abdullah A. Alzeer

Husam K. Almubark

Maijd M. Almotairi

CE 360-Summer Course

Environmental Engineering I


Welcome to CE360 second Term 2015-2016 

Engineering Practice

 Engineering Practice GE 307

CEE-Quality Unit

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Civil and Environmental Engineering Department
College of Engineering, Majmaah University
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CE 212 - Summer Course

Properties and Strength of Materials 1

CE 212

Y from PP0 to PP 6 + PDF Power points
Y Midterm #2 + Model Answer + results Exams
Y lab 3 Labs

Solution of Quiz 4 + Results HW


CE 311- Summer Course

Soil Mechanics and Foundation Engineering

CE 311

M2+ model Answer + PP 1-9 = PDF 1-9 all are available

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