Fly ash is generated as waste in thermal power plants that run on coal. An ideal use for fly ash is in making Portland Pozzolana Cement (ppc). Though cement companies are producing ppc , the market appears to be biased against it. Why? Because the predominantly used Ordinary Portland Cement (opc) is projected to be stronger and takes less time to set.

Cement is graded according to its compressive strength, which is defined in terms of kilogrammes per square centimetre a cube made of 1 part cement, 3 parts sand and water can withstand 28 days after being kept in water. For instance, 53-grade opc will have the minimum compressive strength of 530 kg/sq cm. While only one grade of ppc is available, opc has three grades