District schedule rates (DSR), specification of items of work as per PWD

District schedule rates (DSR), specification of items of work as per PWD, Specification of PCC work, Measurement of work as per IS 1200

1. ESTIMATING & COSTING Topic: District Schedule Rates (DSR), Specification of items of work as per PWD Presented by: Ms. Ashwini A. Chaudhari Lecturer, Department of Civil Engineering, R. C. Patel Polytechnic, Shirpur

2. District Schedule Rates (DSR): Printed Booklet having rates of different works. List of different items of work. Serves as a guide in deciding rates of various items of work. If rates of contractor differs much from DSR rates, his tender may be rejected.

3. Measurement of work as per IS:1200 Lengths shall be measured to the nearest 0.01m. Areas shall be measured to the nearest 0.01m 2 . Volumes shall be measured to the nearest 0.01m 3 .

4. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 1. Cement: OPC Fresh Stock If stored for more than 60 days, test before using

5. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 2. Coarse Aggregate: Of hard broken stones (about 40mm) Free from dust, organic materials Well graded Lesser voids

6. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 3. Fine Aggregate: Of coarse sand (about 4.75 mm) Free from dust, organic materials Hard, sharp, angular In dry condition

7. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 4. Water: Clean & Potable Free from acidic and alkaline matters Free from other impurities

8. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 5. Proportion: Must be measured using a Box Volume of Box must be equal to volume of 1 bag of cement Take 1 bag cement; 4 boxes Fine Aggregate and 8 boxes of Coarse Aggregate

9. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 6. a. Machine Mixing: First put Coarse agg .  fine agg  cement in hopper. Let this dry mixture be mixed for at least 4 turns of hopper Then add water slowly Mix this mixture for at least 2 minutes Get a uniform colored and consistent mixture

10. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 6. b. Hand Mixing: First dry mix Coarse agg ., fine agg ., and cement on a smooth platform. Slowly add water and mix again. Mix shall be turned 3 times in dry condition and 3 times in wet condition. It gives you a consistent and workable mixture.

11. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 7. Laying and Compacting: Before laying concrete in trench, sprinkle some water Concrete is laid slowly in layers not more than 20 cm and compacted before putting another layer Before 2 nd layer is laid, make top surface of 1 st layer rough All this process should be free from dust, leaves, earth etc.

12. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 8. Curing: Concrete must be kept wet for at least 7 days Curing using Gunny Bags or sprinkling water at regular intervals

13. Specification of items of work as per PWD: (A) PCC 1:4:8 for Foundation Concrete: 9. Measurements: Measurement shall be taken in cu.m for finished concrete Measurements (Length, Breadth and Depth) shall be accurate up to 0.01m.