Behavioral study of self-compacting concrete with wollastonite microfiber as part replacement of sand for pavement quality concrete (PQC)
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Date
2019-07
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Abstract
The fact that self-compacting concrete (SCC) does not require any supplementary com paction to fill in every nook and corner of the structure without compromising with
strength and durability makes it much more futuristic and desirable over conventional
concrete. Present study highlights the behavioural changes in SCC for PQC applications
at macro and micro levels with the incorporations of wollastonite micro-fiber; proposed
to be used for restoration of deteriorated pavement quality concrete slab. Wollastonite
micro-fiber was incorporated as part replacement of fine aggregates in proportions of
10–50% with an offset of 10%. Different properties of SCC mixes such as flow-ability, seg regation resistance and filling ability were investigated in fresh state while mechanical
properties including compressive strength, flexural strength and hardened density were
studied in hardened states. The SCC mixes were also investigated for estimating effect of
incorporating wollastonite micro-fiber in hydrated states of cement mortar. Inclusions of
wollastonite micro-fiber in SCC enhanced the cohesiveness of the mix thereby improving
the density and reducing its water absorption. SCC mixes with wollastonite micro-fiber
showed higher flexural and comparable compressive strength parameters than those of
conventional SCC mix. SCC mix with 30% wollastonite micro-fiber as a replacement of fine
aggregates provides similar strength and better repair prospects as compared to conven tional SCC or normal concrete mix.