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Thursday, 4 October 2018

CEMENT


       “A cement is a binder, a substance that sets and hardens and can bind other materials together. It principal constituents for constructional purpose are compounds of Ca(calcareous) and Al + Si (argillaceous)”
       Chemical Composition of Cement        
       Lime                                   63%
Silica                                  22%
Alumina                             06%
Iron oxide                          03%

Gypsum                             01 to 04%

Portland Cement
       “An extremely finely ground product by calcinising together , at above 1500oC , an intimate and properly proportioned mixture of argillaceous (clay) and calcareous (lime) raw materials, without the addition of anything subsequent to calcination , excepting the retarder gypsum”   


Raw materials of Portland cement
       Calcareous materials, CaO [eg. Limestone ]
       Principal Constituent and its proportion can be regulated
       Excess of lime reduces the strength and makes the cement expand & disintegrate
       Lesser amount of lime also reduces the strength by quick setting
       Argillaceous materials, Al2O3 and SiO2 [eg. Clay ]
       Imparts strength
       Makes quick setting
       Excess of alumina weakens the cement
       Powdered Coal or fuel oil
       For burning

       Gypsum (CaSO4 2H2O)                                                                                    

Wednesday, 19 September 2018

Beams

Classification of beams
       Supports
       Geometry
       Shape of cross section
       Equilibrium conditions
       Material

Thursday, 3 May 2018

Some important question in civil engineering

1.What are the foundation and Main objectives of foundation?
2.what is Honeycomb In Concrete?
3.what is Shrinkage and types of shrinkage?
4.TYPES OF ESTIMATE?
5.What is D.S.R?
6.What is Lapping?
7.Type of SLAB?
8.What is COLUMN?
9.what is Neck Column?
10.What is a beam?
11.What is BBS?
12.What is the shear wall?
13. What is shear stress and strain?
14.what is the shear force?
15. what is the maximum deflection in beams?
16.What is the use of Quick Command and how to use this command?
17.What is the use of Ortho, Dynamic input, Infer constraint.
18.What is the use of convert,reference, baseline spacing Command in AutoCAD?
19.what is Conventional Slab.

20.how to calculate Depth of a foundation.