Highway Research Record

PAVEMENT ENGINEERING AND PAVING MATERIALS
3.RIGID PAVEMENT
SUMMARY

In this sub-section, five projects comprising of two completed, one on going and two new projects have been reported. Research work reported in the area of rigid pavements comprises of evaluation of Wollastonite, a mineral admixture, industrial wastes/by-products such as flyash, granulated blast furnace slag, marble slurry dust, silica fume etc. in cement concrete for high performance concrete along with use of superplastizers to improve workability at low W/C ratio. Other project completed is on investigations and suggestions for rectification of cracked concrete slabs of NH-4 (km 515 to km 592 in Karnataka).

SALIENT POINTS FOR DISCUSSION
1. Wollastonite, flyash, blast furnace slag, silica fume etc admixed in cement concrete for improvement in strength, durability     and cost benefits.
2. Marble slurry dust as partial substitute of sand in concrete
3. Methodology for repair of cracked concrete slabs