10,8x10,8m Presentation of Waffel Slab for Cost Comparision
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This document compares the costs of different slab systems for a 10.8m x 10.8m panel. It analyzes the costs of a conventional flat slab, waffle slab, post-tensioned flat slab with drops, and post-tensioned voided flat slab. The waffle slab is the most cost effective at Rs. 3547.5/sqm, offering savings on weight and materials over the conventional flat slab which costs Rs. 4122.75/sqm. While the PT voided flat slab and PT flat slab with drops have higher costs of Rs. 4078.2/sqm and Rs. 4265.75/sqm respectively. Additional savings can be achieved with the waffle
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10,8x10,8m Presentation of Waffel Slab for Cost Comparision
- 1. Cost comparison With Different types of Slab Systems 10.8 x 10.8 Meter Panel Scheme 1 - Conventional Flat Slab Scheme 2 - Waffle Slab Scheme 3 - PT Flat Slab with Drop Scheme 4 - PT Voided Flat Slab Scheme 5 - Steel Building
- 2. Scheme - 1 Conventional Flat Slab 275MM THICK FLAT SLAB WITH 600MM THICK DROPS. Drop size 3.6x3.6m LL – 4.5 KN/M2 SIDL – 3 KN/M2 APPROXIMATE COSTING FOR 10.8X10.8MINTERNAL BAYS CONCRETE 0.311M2/M3 @ 6500/M3 = Rs. 2021.5/M2 SHUTTERING 1.025 @ 650/M2 = Rs. 666.25/M2 REINFORCEMENT GRADE Fy500 28.7 KG/M2 @ Rs.50/Kg = Rs. 1435/M2 TOTAL = Rs. 4122.75/M2
- 4. Waffle Slab With Drop 800X800X500 WAFFEL WITH 100MM THICK SLAB OVERALL DEPTH = 500MM, DEPTH OF RIB = 400MM RIB THICKNESS = 125MM AT BOTTOM, AVERAGE THICKNESS=208MM DROP THICKNESS – 500MM, Drop size 3.6x3.6m LL – 4.5 KN/M2 SIDL – 3 KN/M2 APPROXIMATE COSTING FOR 10.8X10.8MINTERNAL BAYS CONCRETE 0.305 M3/M2 @ 6500/M3 = Rs. 1982.5/M2 COST OF MOULD PER M2 (REFER ANNEXURE) = Rs. 65/M2 COST OF SHUTTERING INCLUDING PROPPING = Rs. 200/M2 REINFORCEMENT GRADE Fy500 APPROX 26 Kg/M2 @ Rs.50/kg = Rs. 1300/M2 TOTAL = Rs. 3547.5/M2 Scheme - 2
- 7. Cost of Moulds (* To be verified as per latest taxes) Say Rs.42.2 cost/Sqm for 100 Repetition ANNEXURE
- 8. NORTH SOUTH UNIVERSITY, BANGLADESH
- 9. NORTH SOUTH UNIVERSITY, BANGLADESH
- 10. Waffel Slab Advantages Advantages Saving on weight and materials Long Spans Attractive soffit appearance if exposed Economical when reusable formwork pans used Vertical penetrations between ribs are easy.
- 11. Flat slab panels with PT & Drops 275MM THICK PT FLAT SLAB & 475MM THICK DROPS. Drop Size – 4.8x4.15m. LL – 4.5 KN/M2 SIDL – 3 KN/M2 APPROXIMATE COSTING FOR 10.8X10.8MINTERNAL BAYS CONCRETE 0.335 M3/M2 @ 6500/M3 = Rs. 2177.5/M2 SHUTTERING 1.025 @ 650/M2 = Rs. 666.25/M2 REINFORCEMENT GRADE Fy500 14 KG/M2 @ Rs.50/Kg = Rs. 700/M2 COST OF PT WORKS = Rs. 722/M2 TOTAL = Rs. 4265.75/M2 Scheme - 3
- 13. PT Voided Flat Slab Scheme - 4 350MM THICK PT VOIDED FLAT SLAB LL – 4.5 KN/M2 SIDL – 3 KN/M2 APPROXIMATE COSTING FOR 10.8X10.8MINTERNAL BAYS CONCRETE 0.297 M3/M2 @ 6500/M3 = Rs. 1930.5/M2 SHUTTERING 1.025 @ 650/M2 = Rs. 666.25/M2 REINFORCEMENT GRADE Fy500 17.75 KG/M2 @ Rs.50/Kg = Rs. 887.5/M2 COST OF PT WORKS = Rs. 593.95/M2 TOTAL = Rs. 4078.2/M2
- 16. Cost of 10.8mX10.8m Panel (only for floor system) 0 500 1000 1500 2000 2500 3000 3500 4000 4500 Conventional Flat Slab Waffel Slab With Drop Flat slab panels with PT & Drops PT Voided Flat Slab CostperSqm Cost per Sqm Scheme 1 Scheme 2 Scheme 3 Scheme 4
- 17. Additional saving in Waffle Slab SAVING IN COLUMNS DUE TO 15% REDUCTION IN SELF WEIGHT Rs. 300/sqm SAVING IN FOUNDATIONS Rs. 36/sqm Summary Conventional Flat Slab Rs. 4122.75/sqm Waffel Slab With Drop Rs. 3547.5/sqm Flat Slab Panels With PT & Drop Rs. 4265.75/sqm PT Voided Flat slab Rs. 4078.2/sqm (* Rate of steel and Concrete vary as per Market Rates.)
- 18. Thank You!