DESIGN AND CONSTRUCTION OF LOW TRAFFIC VOLUME CONCRETE ROADS USING CONSTRUCTION & DEMOLITION AGGREGATES
This paper presents design of low traffic volume concrete roads using C&D aggregates as recycled aggregates (RA) in base/sub-base layer and recycled concrete aggregates (RCA) in pavement quality concrete (PQC) layer. Also, in-situ blended cement with composition (50% OPC-43G cement, 30% Ground granulated blast furnace slag (GGBS) and 20% Flyash) has been used in PQC layer. The study includes testing of C&D aggregates for their suitability in base layer (as RA) and PQC layer (as RCA). It is observed that RA conform to requirements laid by IRC SP-62:2014 for base layer. RCA aggregates were tested for their physical and mechanical properties and concrete mix designs were carried out to with various replacement of natural aggregates with RCA (coarse and fine fraction) at various percentages. Experimental stretches with uniform base using recycled aggregates and PQC Layer with panel size of (1.33 m X 1.25 m) were cast using supplementary cementitious materials (GGBS and flyash with cement) and C&D aggregates (recycled concrete aggregates) at replacement of 75% and 100% to that of natural coarse and fine aggregates. A control stretch with similar base layer and PQC layer with 100% natural aggregates was cast to compare the performance of the experimental stretches. The stretches were analyzed for strain and thermal stresses over a period of 28 days and results were found to be comparable with the control stretch. The study indicated that C&D aggregates can be used as 100% replacement of natural aggregates in base layer (as RA) and PQC Layer (as RCA).
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