Question

b) Why is Rate analysis necessary in civil engineering works? Prepare rate analysis for the following: i) First class Brick work in 1:6 C.S mortar ii) Single coat wearing course surface dressing on top of WBM.

Answer 1

Rate analysis is important as it helps in fixing a fixed costto a certaintype ofwork indlusive of all its variables such as required raw materials,manpowerinputs and cost ofitem used in the work for a fixed quantity (1 square meter, 1cubicmeter etc.). This helps in easy, fastandaccurate cost estimation of work. 1. Brick Work (with cement mortar 1:6) (for 10 cubic meter of brick work) Size of brick (19cm x 9 cm x 9 cm) - (0.19 m 0.09 m x 0.09 m)- without mortar Minimum size of brick with mortar L20 cm x 10 cm x 10 cm) = (0.2mx 0.1 mx 0.1 m) Considering, 10mof volume of brickwork. a) Calculation for quantity of materials Volume of brick without mortar-(0.19 m x 0.09 m x 0.09 md = 1.599 x 10" ms volume of brick with mortar-(0.2 x 0.1 x 0.1-2 x 10" m Quantity of bricks without wastage 10 2 x 10 m) 5000 Nos Add 5% bricks for wastage-5/100 x 5000-250 Nos Total quantity of brick work 525 Nos Wet Volume of mortar-10-45000 x 1539 x 10" ) = 2.31 ms Add 0.5 % mortar for filling wastage etc.-25/100x231-0.599 m3 Total wet volume of mortar = 2.9 ms Dry of volume of mortar-30 %more than total wet volume of mortar - 1.30 x 2.9 3.77 m Quantity of cement 3.77 1+6) -0.538 m3 Therefore, noof bag 0.538/0.085 15.375 bags 16 bags Quantity of sand 3.77 1+6) x 6 3.23 m3 uan ate moun emen 05 ea ason ason e helper emale helper 05 05 05 ay ay tal cost o cubic meter o brick work ost of 1 cubic meter o work