STRENGTH AND DURABILITY OF POLYMER AND FLY ASH
MODIFIED FERROCEMENT ROOFING / FLOORING ELEMENTS
33rd Our World in Concrete and Structures (OWICs) - 2008
L Andal*, Velammal College of Engineering and Technology, Madurai, Tamil Nadu, India
M S Palanichamy, Tamil Nadu Open University, DOTE Campus, Chennai, Tamil Nadu, India
M Sekar, College of Engineering, Anna University, Chennai, Tamil Nadu, India
Ferrocement, Corrosion, First Crack Load, Ultimate Load, Crack Width.
Ferrocement is ideally suited for thin wall structures because of the uniform
distribution and dispersion of reinforcement which provides better cracking
resistance, higher tensile strength to weight ratio, ductility and impact resistance.
However, ferrocement forms minute cracks under small loads and so has a problem
with durability, since cement mortar has conventionally been used as matrix for the
ferrocement. Therefore, to improve the flexural behaviour and durability of
ferrocement, specimens were made with modified mortars. The main objective of this
paper is to study the Flexural strength and durability of Modified Ferrocement
elements. The addition of admixtures in ferrocement improves its Flexural behaviour
To study the corrosion performance of mesh reinforcement, 36 beams of size
300mm long, 50mm width and thickness 25mm were cast by varying the number of
layers of mesh. In order to accelerate corrosion, impressed current voltage test was
conducted and the corrosion process was monitored continuously. The corrosion
performance in conventional ferrocement is compared with that of polymer
ferrocement and fly ash modified ferrocement.
Further the study presented in this work concerns with the application of
modified ferrocement to prefabricated trapezoidal shaped roofing / flooring elements
and its feasibility for adoption for roofing / flooring of small sized residential houses.
Ferrocement trough shaped specimens of length 3000 mm, width 450mm and
thickness 20mm were cast. The specimens were tested as single unit and double
units (placed side by side with screeding concrete) under four point loading. The
experimental results were compared with analytical formulae which is available in the
literature for first crack load and ultimate load.