KUCH AISA KARKE DIKHA KHUD KHUSH HO JAE KHUDA (EXAM SHOULD BE YOUR JUNOON)
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Tuesday, 31 March 2020
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Thursday, 26 March 2020
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Tuesday, 24 March 2020
Monday, 23 March 2020
Engineering Mathematics
Mathematics is the Queen of Science
- A(adjA) = (adjA) A = |A| In
- adj(kA) = k^n-1 (adjA)
- adj(AB) = (adjB). (adjA)
- a square matrix A is said to be singular if |A| = 0 and non singular if |A| is not equal to zero
- a square matrix is said to be symmetric if A^T = A and skew symmetric if A^T = -A
- The main diagonal elements of a skew symmetric matrix are zero
- If A is orthogonal matrix then |A| not equal to zero , in fact |A| = plus or minus 1
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Building Materials (Cement)
Topic: Building Materials
Facts about Cement:
Silica (SiO2): 17to 25%
Alumina (Al2O3) : 3 to 8 %
Calcium sulphate (CaSO4): 3 to 4%
Iron Oxide(Fe2O3) : 3 to 4%
Magnesia (MgO): 0.1 to 3%
Sulphur: 1 to 3 %
Soda and Potash: 0.5 to 1.3%
C2S(Dicalcium Silicate)(2CaO.SiO2) : 20 to 45%
C3A(Tricalcium Aluminate)(3CaO.Al2O3) : 8 to 12%
C4AF(Tetracalcium Alumino Ferrite) ( 4CaO.Al2O3.Fe2O3): 6 to 10%
Note:
1. Normal Consistency Test
Apparatus : Vicat apparatus
2. Initial and final setting time test
Apparatus : Vicat apparatus
3. Sondness Test
Soundness of cement is determined by Le Chatelier's method or Autoclave test
4. Fineness Test
There are three methods for testing fineness
(a) sieve method
(b) Air permeability method ( Nurse and Blaine's method)
(c) sedimentation method or Wagner's method)
5. Heat of hydration Test
Apparatus: Calorimeter
6. Specific Gravity test
Apparatus: Le Chatelier's flask
7. Tensile strength test
Tensile strength of cement is obtained by Briquette test
8. Compressive strength test
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Facts about Cement:
- Chemical composition of cement
Silica (SiO2): 17to 25%
Alumina (Al2O3) : 3 to 8 %
Calcium sulphate (CaSO4): 3 to 4%
Iron Oxide(Fe2O3) : 3 to 4%
Magnesia (MgO): 0.1 to 3%
Sulphur: 1 to 3 %
Soda and Potash: 0.5 to 1.3%
- Bogue's Compound
C2S(Dicalcium Silicate)(2CaO.SiO2) : 20 to 45%
C3A(Tricalcium Aluminate)(3CaO.Al2O3) : 8 to 12%
C4AF(Tetracalcium Alumino Ferrite) ( 4CaO.Al2O3.Fe2O3): 6 to 10%
Note:
- C3S is also called Alite
- C2S is also called Belite
- C3A is also called Celite
- C4AF is also called Felite
- Laboratory Test for Cement
1. Normal Consistency Test
Apparatus : Vicat apparatus
2. Initial and final setting time test
Apparatus : Vicat apparatus
3. Sondness Test
Soundness of cement is determined by Le Chatelier's method or Autoclave test
4. Fineness Test
There are three methods for testing fineness
(a) sieve method
(b) Air permeability method ( Nurse and Blaine's method)
(c) sedimentation method or Wagner's method)
5. Heat of hydration Test
Apparatus: Calorimeter
6. Specific Gravity test
Apparatus: Le Chatelier's flask
7. Tensile strength test
Tensile strength of cement is obtained by Briquette test
8. Compressive strength test
Size of Cube Mould: 7.06 cm
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Important Formulas used in Structural Analysis
Topic: Structural Analysis
2. One internal hinge introduced 4 additional degree of freedom for plane frame and 9 for space frame
3. Hinge is not a joint
For plane frame
Ds= 3C -R'
For Space frame
Ds= 6C-R'
Where C = No of cuts required to make the structure tree like
R' = Number of constraints required to make structure tree like
Note: 1. Ds = Dse + Dsi
Dse= Number of support reaction-3
.Truss
Degree of indeterminacy = m+R-2J
Where m is total number of members
R is the reaction
J is number of joint
Note: 1.If m+R >2J Stable
2. If m+ R<2J Unstable
3. If all the support reactions are parallel then structure is not stable
4. For stability of structure the reactive forces should be non concurrent.
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- Degree of kinematic indeterminacy(Degree of freedom)
Pin jointed plane frame
DOF = 2J-R
Pin jointed space frame
DOF = 3J-R
Plane frame rigid joint
DOF = 3J-R
Space frame rigid joint
DOF = 6J-R
Note: 1. Beam joint is considered as rigid joint2. One internal hinge introduced 4 additional degree of freedom for plane frame and 9 for space frame
3. Hinge is not a joint
- Degree of Static indeterminacy ( Ds)
For plane frame
Ds= 3C -R'
For Space frame
Ds= 6C-R'
Where C = No of cuts required to make the structure tree like
R' = Number of constraints required to make structure tree like
Note: 1. Ds = Dse + Dsi
Dse= Number of support reaction-3
.Truss
Degree of indeterminacy = m+R-2J
Where m is total number of members
R is the reaction
J is number of joint
Note: 1.If m+R >2J Stable
2. If m+ R<2J Unstable
3. If all the support reactions are parallel then structure is not stable
4. For stability of structure the reactive forces should be non concurrent.
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Sunday, 22 March 2020
Introduction to Solid Mechanics
Pressure Vessels
Please click on the above link to open pressure Vessels Notes
Please click on the above link to open pressure Vessels Notes
Saturday, 21 March 2020
IS 456:2000 (Plain and Reinforced concrete code of practice)
Some Facts about IS 456:2000 ( Useful for Gate and ESE Exam)
Organic 200
Inorganic 3000
Sulphate (as SO3) 400
Chlorides (as Cl) 2000 for concrete not containing embedded steel and 500 for reinforced concrete work
Suspended matter 2000
- The pH value of water for making concrete shall not be less than 6
- Permissible limits of solids
Organic 200
Inorganic 3000
Sulphate (as SO3) 400
Chlorides (as Cl) 2000 for concrete not containing embedded steel and 500 for reinforced concrete work
Suspended matter 2000
- Size of Aggregate: The nominal maximum size of coarse aggregate should be as large as possible within the limits specified but in no case greater than one-fourth of the minimum thickness of the member, provided that the concrete can be placed without difficulty so as to surround all reinforcement thoroughly and fill the comers of the form, For most work, 20 mm aggregate is suitable. Where there is no restriction to the flow of concrete into sections, 40 mm or larger size may be permitted.
- Grade of concrete
Standard Concrete: M25 to M55
High strength Concrete: M60 to M80
- Flexural strength of concrete (fcr)
where fck is the characteristic cube compressive strength
of concrete in N/mm2
- The short term modulus of elasticity of concrete can be computed as
Ec is the short tern static modulus of elasticity in
N/mm2
- Actual measured values may differ by ± 20 percent from the values obtained from the above expression.
- The total shrinkage of concrete depends upon the constituents of concrete, size of the member and environmental conditions. For a given humidity and temperature, the total shrinkage of concrete is most influenced by the total amount of water present in the concrete at the time of mixing and, to a lesser extent, by the cement content.
- In the absence of test data, the approximate value of the total shrinkage strain for design may be taken as 0.0003
- Creep of concrete depends, in addition to the factors listed above, on the stress in the concrete, age at loading and the duration of leading.
- In the absence of experimental data the creep coefficient (Ζ) can be computed as
7 days 2.2
28 days 1.6
1 year 1.1
- The long term young's modulus of elasticity (Ecl) can be computed as
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Friday, 20 March 2020
Hello learners, welcome to this learning platform.
I am here to update your civil engineering knowledge for Gate and ESE exam. Stay tuned for more updates
Rashid Mustafa
Assistant Professor and Head of the Department
Department of Civil Engineering
Department of Civil Engineering
Qualifications
| Pursuing Ph.D |
| M.Tech-Civil Engineering(Geotechnical Engineering)-IIT Bombay, Powai, Mumbai,India(2014) |
| B.Tech-Civil Engineering-Aligarh Muslim University(AMU)(2012) |
Area of Research
| Reduction of Earth Pressure on Retaining Wall |
| Numerical Modeling of Retaining Wall |
| Finite Element Analysis in Geotechnical Engineering |
| Numerical Analysis of Geosynthetic Reinforced Soil Retaining wall |
| Reliability Analysis of Retraining wall |
Professional Experience
| 3 years Teaching Experience |
Publications
| 1. Rashid Mustafa, WasimAkram, SahzadaAman, and Mohd.Asif(2017); "Reduction of lateral earth pressure on rigid retaining walls using EPS geofoam inclusions", International Journal of Innovative Research in Science and Engineering,(ISSN(O):2454-9665,ISSN(P):2454-0663,Impact Factor: 2.03 ,Vol.3,Issue 04, pp.878-882) |
| 2. Mohd.Asif, SahzadaAman,Rashid Mustafa and WasimAkram(2017); "Analysis of self-compacting concrete using PPC and OPC with different proportions of fly ash", International Journal of Innovative Research in Science and Engineering,(ISSN(O):2454-9665,ISSN(P):2454-0663,Impact Factor: 2.03 ,Vol.3,Issue 04, pp.872-877) |
Subjects Taught
| Soil Mechanics-I |
| Engineering Hydrology |
| Mechanics of solid -II. |
| Hydraulics & OpenChannel Flow |
| Field Measurement |
| Foundation Engineering |
| Hydraulic Machine |
| Highway Engineering |
| Design of concrete structure-1 |
| Soil and Rock Mechanics |
| Introduction to Solid Mechanics |
| LAB Subjects |
| Soil Mechanics Lab |
| Survey Lab |
| Engineering hygrology lab |
Career
| Head of the Department, Department of Civil Engineering, KEC, Katihar, India ,Feb 2018-Till date |
| Assistant professor,Department of Civil Engineering, KEC, Katihar, India ,Jan 2018-Till date |
| Assistant Professor, Department of Civil Engineering, GNIOT, Greater Noida, India,Feb 2017-Oct 2017 |
Administrative Responsibilities
| Head of the Department,Civil Engineering Happy Learning |
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