Effect of Polypropilene Synthetic Fiber on Shrinkage of Self Compacting Concrete

• Main Author: Muliorahardjo, Andy
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/45416
• Institution: Institut Teknologi Bandung

The development in construction technology led to the increasing need for faster construction techniques, higher strength concrete and energy saving implementation techniques. This encourages the development of concrete mix which can compact by itself. The disadvantage of self compacting conrete is that the shrinkage is relatively larger than normal concrete due to the greater proportion of mortar and the use of smaller maximum aggregate size. Synthetic fibers are expected to improve the mechanical properties of conrete while maintaining the workabilty of self compacting conrete. Synthetic fibers used in this study are polypropylene fibers with a fiber length of 60mm. The addition of fiber causes a decrease in workability which is characterized by a decrease in slump flow test by 12% to 40%, a decrease in J-Ring Test by 25% to 49% and failure in the V-Funnel test. The compressive strength of concrete at 28 days decreases in the range of 8% to 10% and the compressive strength of concrete at 56 days also decreases by 7% to 11%. Concrete elastic modulus also decreases by 10% to 18%. On the other hand, the benefits of using synthetic fibers can be seen from the tensile and flexural properties. The flexural strength of conrete experiences an increase in peak load of 15% to 30%. The addition of synthetic fibers results in the increase of residual strength and increasing toughness of concrete by 4 to 8 times. The splitting tensile strength of concrete has increased by 3% to 34%. The effect of adding synthetic fibers on restrained shrinkage can reduce strain rates by 13% to 48% and stress rates by 8% to 14% and also delay cracks by 29% to 82%.