ESTIMATE THE CONSTRUCTION PROCEDURE OF WATER-BOUND MACADAM ROAD

ESTIMATE THE CONSTRUCTION PROCEDURE OF WATER-BOUND MACADAM ROAD

1. “ ESTIMATE THE CONSTRUCTION PROCEDURE OF WATER-BOUND MACADAM ROAD (WBM)’’ PRESENTED BY HITENDRA R. PENDAM TEJAS B. MANE HEMANT J. NEWARE GUIDED BY MRS. N. A . KRIPAN DEPT. OF CIVIL ENGINEERING GOVERNMENT POLYTECHNIC, GONDIA

2. CONTENT INTRODUCTION CONSTRUCTION PROCEDURE OF WBM ROAD MAINTENANCE OF WBM ROAD REMEDIES OF DAMAGE WBM ROAD ADVANTAGES OF WBM ROAD DISADVANTAGES OF WBM ROAD COST ESTIMATE OF WBM ROAD CONCLUSION REFFERENCES

3. INTRODUCTION What is WBM Road? Full form of WBM is Water Bound Macadam. It is the layer of broken stone aggregates bound together by stone dust or screening material and water applied during construction and compacted by heavy smoothed wheel roller . It is the oldest type of highway pavement used in modern times is known as Macadam after the name of  Johan Macadam , A Scottish Engineer

4. CONSTRUCTION PROCEDURE OF WBM ROAD PREPARATION OF SUB-GRADE :- The site is cleared and weak spots corrected and rolled and 40: 60% mix the stone chips and sand then make sub-base then add water to sub-base then compaction it. On the clayey subgrade, a blanket of granular material of a thickness of about 10cm is provided. The  subgrade  should be well-drained and checked for stability etc.

5. PREPARATION OF BASE COURSE :- A layer of bolder stone or bricks provided in double layer over the sub-base course and over the subgrade in road pavement is known as base course Layer provide on base course is known as intermediate layer INTERMEDIATE LAYER :- WEARING COURSE :- The top most smoothing riding surface road pavement to traffic is call as wearing course The shoulder is a strip of pavement outside of the road is known as shoulder. it is provided for emergency use by traffic and to protect the pavement edges from traffic damage SHOULDER :-

6. SPREADING OF AGGREGATES :- The coarse  aggregate  is spread on the prepared surface of sub-grade evenly in layers. The thickness of each layer should be such that it gives 7.5 cm thick layer on compaction. The profile of the road is checked by placing templates across the road every 6 meters. To ensure proper camber and grade the surface is checked from time to time.

7. MATERIAL REQUIRED FOR CONSTRUCTION OF WBM ROAD :- For WBM construction following materials are required. Coarse aggregate 2. Screenings 3. Fillers Materials Size  –  90 to 40 mm or 63 to 40 mm or 50 to 25 mm 10 to 12.5 mm size screenings may be used. To prevent raveling of WBM surface layer the filler material should contain sufficient clay content. Plasticity index of filler material may be up to 9.0.

8. DRY-ROLLING :- The objective of this rolling is to key the coarse aggregate thoroughly. After spreading the coarse aggregate and checking all irregularities, the rolling is done by 6 to 10 tones, 3 wheeled power roller. Usually rolling is started from the edges with roller running forwards and backwards till the aggregate is fully compacted.

9. APPLICATION OF SCREENING :- The next step is the application and keying of screening. after the coarse aggregates are set and keyed thoroughly by the rolling, the screenings are spread uniformly and rolled. Generally spreading, brooming and rolling operations are carried out simultaneously. The quantity of screening is generally used to fill about 50% of the total voids and the rest 50% voids are filled with filler materials.

10. WET ROLLING :- After spreading the screening, the surface of the layer is sprinkled with water and rolled again. The sprinkling of water and rolling is continued till all the voids are filled and a wave of grout flushed ahead of the roller. This indicates that all voids are filled with chocking material. The quantity of water and screening are generally dependent upon many factors such as size and nature of aggregate, type of surface desired, etc.

11. APPLICATION OF FILLERS :- The filler material is applied in two successive thin layers. the plasticity index of the filler material should not be more than 9. After the application of the filler, water is sprinkled on the surface and the slurry is allowed to fill the voids. Now rolling is done with 6 to 10-tonne roller. to wash down the binding material off the wheels of the roller water is poured on them.

12. SURFACE FINISHING :- The section prepared as discussed above is allowed to dry overnight and then a  thin layer about 0.6 cm thick of sand or earth spread over the surface. The surface lightly sprinkled with water and rolled again. SHOULDERS :- These are made of the same cross slope as that of pavement and are compacted by rolling. After proper drying and set of the WBM, It is opened to the traffic.

13. MAINTENANCE OF WBM ROAD :- WBM is the basic stage of the planned improvement of road surfacing. Wbm roads are damaged rapidly due to the heavy traffic and adverse climatic conditions. The steel tyred bullock carts cause serve wear and tear to the WBM surface. In dry weather, dust is formed and in rainy season mud is formed on WBM road. Fine particles are sucked up by fast-moving vehicle from the road surface resulting in loss of binding particles in the surface. In the rainy season, the rain is soaked by the surface which makes the surface soft. In such conditions, the movement of vehicles makes the layer of surface loose. In this situation, some aggregate gets displaced from their position causing ruts and potholes on the surface.

14. REMEDIES OF DAMAGE WBM ROAD :- To prevent aggregate from getting loose from the surface course, a thin layer of moist soil should be spread over the surface periodically, particularly after the rainy season. The dust nuisance can be effectively eliminated by providing a surface dressing of bituminous materials

15. ADVANTAGES OF WBM ROAD :- Construction Cost of WNM road is low. No skilled labors are required for the construction of WBM road. Locally available material can be used in the construction of WBM road. DISADVANTAGES OF WBM ROAD :- WBM roads required high maintenance. WBM roads are less durable. Inconvenience and danger to traffic if not properly maintained.

16. BASE SUB-BASE SUBGRADE COST ESTIMATE OF WBM ROAD Assume, the cost of construction will be measured for a water bound macadam road having length one kilometer and width 3.5 meters. The road contains 20 cm base of 10 to 20 cm. The road contains 20 cm base supported with 10 to 20 cm size stone boulders as well as 10 cm dense road metal of 1.5 to 3 cm size crushed stone. 3.50M 10CM 15CM 20CM 3.80M

17. ABSTRACT OF QUANTITIES ? 1. Subgrade preparation & Dressing For No of Roads is 1 Length = 1000M Breadth = 3.80M 0M because Subgrade is just the surface Height = Quantity :- 1000 X 3.80 = 3800   Remark :- 3.50 + 0.15 + 0.15 = 3.80M 2. Sub-base Materials Length = 1000M Breadth = 3.80M Height = 10CM + 20CM = 30CM = 0.30M Quantity :- 1000 X 3.80 X 0.30 = 1140   Remark :- 3.50 + 0.15 + 0.15 = 3.80M CALCULATIONS :-

18. 3. Labors for spreading and consolidation of sub-base Length = 1000M Breadth = 3.80M 0.30M Height = Quantity :- 1000 X 3.80 X = 1140   Remark :- 0.20 + 0.1 = 0.30M 4. Base layer materials Length = 1000M Breadth = 3.50M Height = 0.15M Quantity :- 1000 X 3.50 X 0.15 = 525   Remark :-   5. Labor for spreading and consolidation of base Length = 1000M Breadth = 3.50M Height = 0.15M Quantity :- 1000 X 3.50 X 0.15 = 525   Remark :-  

19. SOLUTION TABLE:- ABSTRACT OF QUANTITIES ? DISCRIPTION No Length Breadth Height Quantity Remark Subgrade preparation & Dressing 1 1000 3.80 -------- 3800M 3.50 + 0.15 + 0.15 = 3.80 Sub-base Materials 1 1000 3.80 0.30 1140M 3.50 + 0.15 + 0.15 = 3.80 0.20 + 0.1 = 0.30 Labors for spreading and consolidation of sub-base 1 1000 3.80 0.30 1140M 0.20 + 0.1 = 0.30 Base layer materials 1 1000 3.50 0.15 525M 0.1 + 0.05 = 0.15 Labor for spreading and consolidation of base 1 1000 3.50 0.15 525M 0.1 + 0.05 = 0.15 2 3 3 3 3

20. 2. ABSTRACT OF COST ? For No of Roads is 1 CALCULATIONS :- 1. Preparation, consolidation and dressing of sub grade 2. Supplying sub base materials and stacking at road side Quantity :- 3800   Unit :-   Market Rate :- 20 Rs /   Amount (Rs) :- 20 X 3800 = 76000 Rs Quantity :- 1140   Unit :-   Market Rate :- 210 Rs /   Amount (Rs) :- 210 X 1140 = 239400 Rs

21. 3. Laboure for spreading and consolidation of sub base materials 4. Supplying base materials and stacking at road sides 5. Laboure for spreading and consolidation of base materials Quantity :- 1140   Unit :-   Market Rate :- 200 Rs /   Amount (Rs) :- 200 X 1140 = 228000 Rs Quantity :- 525   Unit :-   Market Rate :- 220 Rs /   Amount (Rs) :- 220 X 525 = 115500 Rs Quantity :- 525   Unit :-   Market Rate :- 250 Rs /   Amount (Rs) :- 250 X 525 = 131250 Rs

22. Total Amount = 76000 + 239400 + 228000 + 131250 + 115500 = 790150 Rs 1000M WATER BOUND MACADAM ROAD TOTAL COST IS 790150 Rs

23. 2. ABSTRACT OF COST ? SOLUTION TABLE :- DISCRIPTION Quantity Unit Rate Amount (Rs) Preparation, consolidation and dressing of sub grade 3800 20 20 x 3800 = 76000 Rs Supplying sub base materials and stacking at road side 1140 210 210 x 1140 = 239400 Rs Laboure for spreading and consolidation of sub base materials 1140 200 200 x 1140 = 228000 Rs Supplying base materials and stacking at road sides 525 250 250 x 525 = 131250 Rs Laboure for spreading and consolidation of base materials 525 220 220 x 525 = 115500 Rs DISCRIPTION Quantity Unit Rate Amount (Rs) Preparation, consolidation and dressing of sub grade 3800 20 20 x 3800 = 76000 Rs Supplying sub base materials and stacking at road side 1140 210 210 x 1140 = 239400 Rs Laboure for spreading and consolidation of sub base materials 1140 200 200 x 1140 = 228000 Rs Supplying base materials and stacking at road sides 525 250 250 x 525 = 131250 Rs Laboure for spreading and consolidation of base materials 525 220 220 x 525 = 115500 Rs Total Amount 790150 Rs

24. CONCLUSION As the population is increasing day-to-day, we have to enhance our roads for higher effectiveness in transportation. The wbm road constructed by keeping in mind the future aspects to full fill the requirements of road users.

25. WWW.WIKIPEDIA.COM WWW.GOOGLE.COM WWW.YOUTUBE.COM REFERENCES

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