Highway Research Record

VI. RESEARCH WORK DONE IN ACADEMIC INSTITUTIONS RELATED TO THESIS WORK
B. PAVEMENT ENGINEERING AND PAVING MATERIALS
A Study on the Effect of Fibre Reinforcement in Concrete Pavements

Date of Start:June 2004
National Institute of Technology, Tiruchirappalli (R,S)

Scope and Objectives
(i) To find out the strength characteristics of Fiber Reinforced concrete for Pavement
(ii) To optimize the fiber proportions
(iii) To study the mechanical characteristics of the fiber reinforced concrete
(iv) To find out the cost effective cross section of the pavement.
(v) To increase toughness of the concrete pavement.
(vi) To increase the impact strength of the concrete pavement.

Methodology
(i) Mechanical properties of control concrete for M30 mix is found out.
(ii) Mechanical properties of coir reinforced concrete with 0.5, 0.6 and 1.0% are found out for M30 mix.
(iii) Mechanical properties of concrete with 0.5, 1.0, 1.5, and 2.0% of steel chips are found out for M30 mix.
(iv) Optimum steel and coir content is found out.
(v) Mechanical properties of M35 concrete mix is also found out for optimum coir and steel content.
(vi) Impact strength and abrasion of concrete is also found out for optimum coir and steel content.

Findings and Conclusions
(i) For 0.5% of coir proportion, the compressive strength is increased slightly i.e. 1% and the flexural strength by 6%.
(ii) For 1% of coir proportion the compressive strength is decreased by 8% and the flexural strength by 14%.
(iii) For 0.5% of steel proportion the compressive strength is increased by 4.6% and flexural strength by 33%
(iv) For 1% of steel proportion the compressive strength is increased by 9% and the flexural strength by 67%.
(v) Increase in coir content decreases both the compressive strength and flexural strength of the concrete
(vi) Adding the fibers without proper aspect ratio decreases the strength
(vii) As this coir is locally available, economical, ecofriendly this can be used in the pavements provided durability of the coir      should be considered.
(viii) By adding steel chips the mechanical properties of the concrete such as compressive strength and flexural strength of the       concrete is increased.
(ix) The mechanical properties of the concrete are increased by increasing the proportion of the steel chips.
(x) The optimum fibre content for coir is 0.6% and for steel is 1.5%
(xi) The impact strength of concrete is increased for fibre reinforced concrete when compare to control concrete.