SELF COMPACTING CONCRETE CONTAINING WOLLASTONITE MICRO-FIBER FOR REPAIR OF PQC

Abstract

Concrete pavements are environment friendly and sustainable in all aspects of design, construction, operation and maintenance. Pavements constructed with concrete offer significant advantage when compared to bituminous pavements. Concrete roads are the most durable, safe and cost efficient. The repair and rehabilitation of concrete pavements involves many pavement restoration techniques depending upon the desired repair effects. There are several pavement restoration techniques available for concrete roads such as full depth repairs, partial depth repair, diamond grinding, dowel bar retrofit, joint and crack resealing, slab stabilization, cross stitching, grooving, retrofitting edge drains and retrofitting concrete shoulder. Out of all pavement restoration methods full-depth repairs are one of the most common repairs performed on concrete pavements, because they improve pavement ride ability, structural integrity, and extend pavement service life. The objective of this study is to evaluate the potential of wollastonite micro-fiber as a part replacement of fine aggregate in Self Compacting Concrete for repair and rehabilitation of concrete pavements. Self-Compacting concrete (SCC) is an important emerging material that can be used for many applications related to transportation infrastructure. SCC has an advantage over conventional concrete in that it can be easily placed without vibration or mechanical consolidation. In order to check the efficacy of wollastonite micro-fibre, self compacting concrete was prepared with part replacement of fine aggregates at different replacement levels ranging from 10% to 50%. The present study mainly emphasis on production of effective self compacting concrete using wollastonite micro-fibers for use in restoration of deteriorated pavement quality concrete slab. In order to ascertain certain properties of SCC mixes, tests on fresh concrete and hardened concrete were got conducted. Slump flow test, V-funnel test and probe test were investigated for fresh SCC mixes and simultaneously the mechanical properties of hardened concrete like compressive strength and flexural strength of SCC mixes were investigated. In addition to these tests, saturated