Influence of fly ash and bottom ash on properties of glass and polypropylene fiber reinforced concrete
  Virendra Kumara K.N and S.B. Anadinni
  Plain concrete possesses very low tensile strength, limited ductility and little resistance to cracking. When fibers are added in certain percentage in the concrete, it improves strain properties. With the ecological imbalance in the nature due to exploitation of natural sand from rivers, there is much need to utilize the industrial wastes in concrete as an initiative to replace the natural sand and also as maintain and develop sustainable environment through the construction industry. In this experimental study the effect of fly ash and bottom ash as a partial replacement of cement and fine aggregate respectively in concrete mixes is presented with glass fibers and polypropylene fibers. The laboratory experiment was carried out on concrete of M40 grade GFRC and PPFRC produced from 0%, 10%, 20%, 30%, 40% and 50% replacement of cement with fly ash along with the same percentage replacement of sand with bottom ash. The fibers were introduced at constant 1% glass fibers and 1.5% polypropylene fibers to the concrete and it was compared with normal concrete [1, 2]. The laboratory program included workability, compressive strength, split-tensile strength, flexural strength, modulus of elasticity and drying shrinkage effect of concrete. From the experimental investigation it was found that at 56 days, with the addition of glass fibers we could achieve good strength and less shrinkage than that with addition of polypropylene fibers. The optimum percentage of fly ash and bottom ash was found to be 30% for the strength and 20% for minimum shrinkage in glass fiber reinforced concrete. The concrete with polypropylene fibers gave optimum strength and less shrinkage at 20% replacement with fly ash and bottom ash.