Strength and Surface Quality Properties of SCC Made Using Controlled Permeable Formwork Liner

Corrosion in reinforced concrete structures is a major problem worldwide, resulting in significant repair and retrofit costs. All aggressive agents penetrate from the surface of the concrete into the concrete and initiate corrosion of the rebar. Controlled Permeability Formwork (CPF) is a positive method to improve the quality of concrete surface zones. This technique is used to expel excess water and trapped air from near the surface of fresh concrete while retaining cement and other fine particles. This ensures a reduced water-cement ratio (w-z), increased cement content and reduced surface porosity in the concrete cover zone. CPF action creates a smooth surface without pins and punches. This paper reports an experimental study conducted to investigate the effects of his CPF liners on the mechanical properties and surface quality of self-compacting concrete (SCC). Samples were prepared against CPF liner and impermeable steel formwork (IMF) and tested at 7, 14, 28, and 60 days. Tests performed include compression, split tensile and flexural strength, rebound number, ultrasonic pulse velocity, and abrasion resistance. The results show that the CPF concrete samples showed significant improvement in tensile strength and rebound number compared to his IMF concrete samples. Top 20mm concrete quality improved to SCC by using CPF liner.

Author(s) Details:

S. Kandasamy,
Department of Civil Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, India.

S. Syed Ibrahim,
Department of Civil Engineering, Ilahia College of Engineering and Technology, Ernakulam, Kerala, India.

P. Gowdhamramkarthik,
Department of Civil Engineering, Government College of Engineering, Dharmapuri, Tamil Nadu, India.

N. Pannirselvam,
Department of Civil Engineering, SRM Institute of Science and Technology, Chennai, India.

M. Rajaram,
Department of Civil Engineering, SRM Institute of Science and Technology, Ramapuram Campus, Chennai, India.

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Keywords: Abrasion resistance, compressive strength, controlled permeability formwork, rebound number

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