UNIVERSITY OF THE PHILIPPINES LOS BAÑOS College of Engineering and Agro – Industrial Technology
Department of Civil Engineering
DESIGN ASSESSMENT OF THE CONVERTED CONVENTIONAL SLAB TO A DATEM PRECAST SLAB: CASE OF THE EAST OF
GALLERIA PROJECT
LEX MORGAN ROBLES DE OCAMPO
BACHELOR OF SCIENCE IN CIVIL ENGINEERING
APRIL 2009
The report attached hereto entitled DESIGN ASSESSMENT OF THE CONVERTED CONVENTIONAL SLAB TO A DATEM PRECAST SLAB: CASE OF THE EAST OF GALLERIA PROJECT, prepared and submitted by Lex Morgan R. de Ocampo in partial fulfillment of the requirements for the degree of Bachelor of Science in Civil Engineering is hereby accepted.
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ENGR. DAN MICHAEL A. SADIA PROF. ANGELI D. CABALTICA Panel Member Panel Member
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Date Signed Date Signed
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ENGR. JENNYL R. ESTIL Adviser
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Date Signed
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PROF. MARLOE B. SUNDO Chairman
Department of Civil Engineering
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DR. ARSENIO N. RESURRECCION Dean
College of Engineering and Agro-Industrial Technology University of the Philippines Los Banos
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Date Signed
TABLE OF CONTENTS
Title page i
Acceptance Sheet ii
About the Author iii
Acknowledgement iv
Table of Contents vi
List of Tables viii
List of Figures ix
1. INTRODUCTION
Background of the Study 1
Significance of the Study 2
Objectives of the Study 3
Scope and Limitations of the Study 3
Date and Place of the Study 4
2. REVIEW OF RELATED LITERATURE
2.1 Flooring System 5
2.2 Cast-In-Place Concrete 6
2.2.1 Reinforced Concrete 6
2.2.2 Types of Cement 7
2.2.3 Aggregates 7
2.2.4 Reinforcing Steel 8
2.2.5 Slump Test 9
2.2.6 Formworks 10
2.2.7 Shoring 10
2.3 Precast Concrete 12
2.3.1 Precasting Advantage 12
2.3.2 Precasting Problems 13
2.4 Types of Slabs 14
2.5 Slab Design 15
2.5.1 One-Way Slab 16
2.5.1.1 Slab Thickness 17
2.5.1.2 Shrinkage Reinforcements 18
2.5.1.3 Concrete Cover 19
2.5.1.4 Coefficient Method 19
2.5.2 Two-Way Slab 21
2.5.2.1 Slab Thickness 21
2.5.2.2 Reinforcements 22
2.5.2.3 Coefficient Method 23
2.6 Cost Analysis 24
3. STUDY METHODOLOGY 26
4. OBSERVATIONS
4.1 DATEM Slab 32
4.2 Casting Site 33
4.3 Precast Slab Panels 33
4.3.1 Preparations and Reinforcements 34
4.3.2 Concreting 34
4.3.3 Vibration 35
4.3.4 Stripping 36
4.3.5 Handling 36
4.3.6 Fixing 37
4.4 Cast-In-Place Concrete Slabs 37
4.4.1 Shoring 38
4.4.2 Formworks 39
4.4.3 Reinforcements 39
4.4.4 Concreting 41
4.4.5 Vibration 42
4.4.6 Finishing 42
5. DISCUSSION AND ANALYSIS
5.1 Time Consumed in Slab Construction 43
5.1.1 DATEM Slabs 43
5.1.2 Cast-In-Placed Slabs 44
5.2 Total Cost in Slab Construction 44
5.2.1 DATEM Slabs 44
5.2.2 Cast-In-Placed Slabs 46
5.3 Slab Capacity 47
5.4 DATEM Slab Efficiency 56
5.4.1 Slab Capacity Efficiency 57
5.4.2 Time Efficiency 61
5.4.3 Cost Efficiency 61
5.5 DATEM Slab Construction 62
6. CONCLUSION 63
7. RECOMMENDATION 64
BIBLIOGRAPHY 65
APPENDICES
APPENDIX A. 5thFloor one-way Slab Capacity Data 67 APPENDIX B. 7th Floor one-way Slab Capacity Data 70
APPENDIX C. 5thFloor Top Rebar List 73
APPENDIX D. 5thFloor Bottom Rebar List 76
APPENDIX E. Precast Panels Reinforcements List 79
APPENDIX F. Total No. of Precast Panels in 7thFloor 82
APPENDIX G. Area and Volume of Slab 85
APPENDIX H. Daily reports of the site working hours of 5th and 7thfloor 88 APPENDIX I. One-way and two-way slab determination 90 APPENDIX J. 5thFloor two-way Slab Capacity Data 93 APPENDIX K. 7thFloor two-way Slab Capacity Data 95
APPENDIX L. 5thFloor Framing Plan 97
APPENDIX M. 7thFloor Precast Panel Framing Plan 98 APPENDIX N. Sample 100x100 mm Spacing Precast Panels 99 APPENDIX O. Sample 50x50 mm Spacing Precast Panels 100 APPENDIX P. Moment Coefficients for Two-Way Slabs 101
LIST OF TABLES
Table 2-1. Echo Floors Characteristics 6
Table 2-2. Minimum Thickness of Non-Prestressed beams or One-Way slabs 18 Unless Defletions are Computed
Table 2-3. NSCP Coefficients 20
Table 5-1. Time Consumed in DATEM Slab 43
Table 5-2. Time Consumed in Cast-In-Place Slab 44
Table 5-3. Cost Consumed Using DATEM Slab 45
Table 5-4. Unit costs of materials used in DATEM slab 45 Table 5-5. 5thand 7thfloor Total area and volume 45 Table 5-6. Cost consumed using cast-in-placed slab 46 Table 5-7. Unit costs of materials used in cast-in-placed slab 46 Table 5-8. EOG Slab properties 47 Table 5-9. Slab capacity of one way slab for the 5thfloor 48 Table 5-10. Slab capacity of one-way slab for the 7thfloor 51 Table 5-11. Slab capacity of two way slab for the 5thfloor 53 Table 5-12. Slab capacity of two way slab for the 7thfloor 55
Table 5-13. Time and cost per square meter. 57
Table 5-14. Difference in Capacity of one-way DATEM slab to the 58 cast-in-placed slab
Table 5-15. Difference in Capacity of two-way DATEM slab to the 59 cast-in-placed slab
LIST OF FIGURES
Figure 1-1. The East of Galleria Perspective view 1 Figure 1-2. Vicinity Map of the East of Galleria Project 4
Figure 2-1. Echo Floor precast panels 5
Figure 2-2. Deformed rebar 8
Figure 2-3. Wire Mesh reinforcement 9
Figure 2-4. Slump cone mold 10
Figure 2-5. Shoring Frame 11
Figure 2-6. Post Shore 12
Figure 2-7. Unit strip basis for flexural design in one-way slab 17
Figure 2-8. Middle and Column Strips 21
Figure 2-9. Variations of moments across the width of critical sections 24 assumed for design
Figure 2-10. Sample Cost Analysis of Precast slabs 25
Figure 3-1 Methodology for the computing of time consumed using 28 DATEM slab system.
Figure 3-2 Methodology for the computing of time consumed using the 29 conventional method system.
Figure 3.3 Methodologies for computing the overall cost of the DATEM 30 slab system.
Figure 3.4 Methodologies for computing the overall cost of the conventional 31 method system.
Figure 4-1. Precast panels reinforcements 32
Figure 4-2. The DATEM casting site 33
Figure 4-3. The molding area of precast slab panels with concrete 34 reinforcements
Figure 4-4. Concreting of the precast panels using a bucket 35 Figure 4-5. Slump test conducted for the concrete used in the precast panels 35
Figure 4-6. Stripping of precast slab panels 36
Figure 4-7. Trucks used to transport precast panels 36
Figure 4-8. Fixing of precast slab panels 37
Figure 4-9. Shoring System in the EOG 38
Figure 4-10. Slab formwork construction in EOG 39
Figure 4-11. Rebar Cutting 40
Figure 4-12. Slab with complete reinforcement 40
Figure 4-13. Concrete Spacer 41
Figure 4-14. Concrete preparation and placement 41
Figure 4-15. Consolidation in the Cast in Place concrete 42 Figure 4-16. A power float used in finishing a slab 42
