Q Bank for Civil Engineer LDCE Exam- Write Short Notes on (18)

Q.No..18. Write Short Note on.

b. Classification of Railway station. 

c. Pile foundation 

d. Mix design. 

e. Tiles and Checker Tiles. 

b. Classification of Railway Station :- railway station can be classified in 3 main consideration. 

A. Operation consideration. 

B. Earning consideration 

 C. Functional consideration. 

a. The classification of station as per operational consideration as category as block & non block station. Block station are further classified as A class, B class & C class. Station. Non block station are classified as D class station and flag station. 

b. 2 On basis of earning consideration. Station are also classified as per condition of annual passenger earning. As per the consideration station have been classified in 6 categories as A,B,C,D,E&F categories. 

c. On the basis of functional consideration station are classified based on the function as their function as The station are required to performed. Under this category station are classified as Halt station, Flag station, Crossing station or way side station, Junction station and terminal station.

c. Pile foundation.

Ans:- Pile foundation are slender, circular member of timber, hollow pipes, or RCC , either driven or cast in situ. Due to slender ness pile are not used in those bridges where scouring are involved. Pile are classified as under. 

i. Based on load a. Friction Pile – it transfer load by skin friction b. Bearing Pile – it transfer load by end bearing c. Bearing cum friction pile - it transfer load by skin friction and end bearing

ii. Based on construction method. 

a. Driven – Pre cast pile and cast in Situ pile 

b. Bored Pile - cast in situ pile and compact pile 

iii. Based on construction material. 

a. Timber Pile 

b. Steel pile 

c. RCC Pile 

 d. Mix design . 

Ans:- Cement , Sand, Coarse aggregate are mix in a certain proportion which can be 1:4:8, 1:3:6, 1:2:4, 1:1.5:3 i.e. M-10, M-15, M-20 grade of concrete such mixes are known as nominal mix and prepare by volume or weight batching. However if grade of concrete exceed M-20 than proportion of ingredients design in lab than implicated in filled. Such higher grads of concrete are complemented by inclusion of admixture so as to achieve higher compressive strength. Proportion of such admixture are essential in mix design to get more workability with less water cement ratio. Design mix is adopted in important nature of works and a weigh batcher is also must at site to mix proper weight of ingredients. 

e. Tiles and Chequered Tiles. 

 Ans:- The tiles are very important building material for floor and dado treatment and kitchen bath & toilet walls and flooring .The tiles shall be of approved Indian manufacture and conform to specifications IS:777-1970. They shall be flat and true to shape and free from cracks, chips, craze, specks, crawling or other imperfections detracting from the appearance. The glaze shall be either glossy or matt. The body of the tile on fracture shall appear fine grained in texture, dense and homogeneous. The special consist of cove- bases, angles, beads, round edge tiles, corner cups, ridge and legs etc. 

 Chequered Tiles:- These tiles are very important building material for providing antislipry surface such as path for physically challenged person at station in different location. These tiles shall conform to Indian standard laid down in IS: 1237-1980, The size of tiles to be used shall be as laid down in the drawing. The colour and texture of the wearing layer in the tiles shall be uniform throughout its thickness. The wearing face of the terrazzo tiles shall be free from projections, depressions and cracks. The angles shall be straight & true. The upper layer shall consist of marble chips and cement(with or without pigment)