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Retrofitting of Beams Using Abaca Fiber

(Hazard Mitigation and Infrastructure

Renewal Related to Natural Disasters)

Introduction

Methodology

The experimental work undertaken in this study consisted of third point loading tests of the simply supported RC beams. In addition, material tests were carried out to determine the mechanical properties of the concrete, reinforcement steel and AFRP which were used in constructing and retrofitting the beams.

Twelve beams were tested under Third point loading (ASTM C1609/C1609M) after curing for 28 days. The beams were divided into two groups. For group RF, focus was on flexural behaviour, and for group RS focus was on shear behaviour.

And beams are subjected to retrofitting except for the controlled beams.

Manufacturing of beams

Inadequate designs of structures and earthquakes have been frequently observed in the Philippines. It creates great devastations in terms of money, time and structural failure. This phenomena leaves major threats to any structural members especially for beams. Cracking in beams reduces its load capacity and allows the water to penetrate to the reinforcements which causes corrosion.

Pre-Loading of Beams

Retrofitting of Cracked beams

Test for Flexural strength

Conclusion and Recommendations

The mentioned alarming situation spurred the researcher’s attention to conduct a study entitled “Retrofitting of Reinforced Concrete Beams using Abaca fibres.” This would be a one way of addressing the problems concerning structural member failures and make an alternative way in mitigating effects of seismic to the beams. Furthermore, this research study really intends to utilize locally available materials wherein Philippines is the number one abaca producers and to produce an economical and effective retrofitted beams which will be used to save time and money.

OBJECTIVES

SIGNIFICANCE OF THE STUDY

The result of this study can help different sectors who has concern on damage beam due to earthquake, axial load failure, and other factors. This study can give alternative solution of restoring or even surpassing the original strength of the beam without full reconstruction of the structure.

General Objective:

The main objective of this study is to develop a technique for providing significant increase in strength and toughness to cracked masonry structure by retrofitting it using abaca fibre reinforced plastic.

Specific Objective:

• To determine the physical properties of aggregate and cement to be used in the study.

• To determine the design mixture.

• To determine the slump of concrete to be used in the study.

• To compare the flexural strength of the original concrete beam to the retrofitted beam with AFRP.

• To determine the effect of retrofitted beam using AFRP.

• To determine the amount of AFRP to be applied on that will give the maximum strength of the retrofitted concrete.

• To determine the total unit costing of material per square meter of work.

Notes

1. What are the physical properties of aggregate and cement to be used in the study?

STATEMENT OF THE PROBLEM

2. What will be the design mixture of concrete?

3. What will be the slump of concrete mixture used in study?

The research is focus to the strength analysis of retrofitting the concrete beam using abaca fibre reinforced plastic.

References

4. What will be the flexural strength of concrete beam to be used in study?

5. What will be the flexural strength of retrofitted concrete beam with AFRP?

6. What will be the behavior of the retrofitted beam using AFRP?

Projected Cost

Aggregate

Portland Cement

Unit Price

Coarse aggregate

P230/bag

Cost

7. How much AFRP will be needed to restore or surpass the original strength of the beam?

Fine Aggregate

500/cu.m

P920.00

Abaca Fiber

8. What will be the economical variability of the product?

650/cu.m

P1000.00

Bazaa, I. M., M. Missihoun, and P. Labossiere (1996), "Strengthening of Reinforced Concrete

Beams with CFRP Sheets," Proceedings of the First International Conference on Composites in

Infrastructures (ICCI'96), Tucson, Arizona, USA, January 1996, pp 746-759.

2 Chajes, M. J., T. A Thomson, JR, and B. Tarantino (1995), " Reinforcement of Concrete Structures

Using Externally Bonded Composite Materials," Proceedings of the second International RILEM

Symposium (FRPRCS-2), August 1995, pp 501-508.

3 Grace, N. F., A. K. Soliman, G. Abdel-Sayed, and K.R. Saleh (1999a), "Strengthening of

Continuous Beams Using Fiber Reinforced Polymer Laminates," Proceedings of the Fourth

International Symposium on Fiber Reinforced Polymer Reinforcement for Reinforced Concrete

Structures, ACI International SP-188-57, 1999, pp 647-658.

4 Grace, N. F., G. A. Sayed, A. K. Soliman, and K.R. Saleh (1999b), "Strengthening Reinforced

Concrete Beams Using Fiber Reinforced Polymer (FRP) Laminates," ACI Structural Journal/

September- October 1999, pp 865-874.

5 Swamy, R. N., and P. Mukhopadhyaya (1995), "Role and Effectiveness of Non-Metallic Plates in

Strengthening and Upgrading Concrete Structures," Proceedings of the second International

RILEM Symposium (FRPRCS-2), August 1995, pp 473-482.

6 American Concrete Institute, Committee 440 (1996), "State-of-the-art report on Fiber Reinforced

Plastic (FRP) Reinforcement for Concrete Structures,".

7 Meier, U., and A. Winistorfer (1995), "Retrofitting of Structures Through External Bonding of

CFRP Sheets," Proceedings of the second International RILEM Symposium (FRPRCS-2), August

1995, pp 465-472.

Polymer

P1300.00

Epoxy Resin

P300.00

Testing

P900.00

Formworks

Thank You! :)

P1500.00

P3000.00

P325.00

P9245.00

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