“A geopolymer concrete road stretch of 50 meter length and 3 meter width with 40 Mega Pascal concrete strength has been laid successfully at CSIR-CBRI, Roorkee using NTPC Dadri fly ash, the first of its kind in India. This geopolymer road will not require water curing as required by cement concrete road and also paves the way for bulk fly ash utilization,” said NTPC, the government-owned largest power generation company in India.
Due to lack of utilization of fly ash, India’s ministry of environment and forests had issued several directions since 1999. Last year, the government had mandated that fly ash should be used in building material and in construction activities, like road building. “Only 20-30% of fly ash is being currently used in making Pozzolana Portland Cement (PPC). Though there are technologies available worldwide for using 80% of fly ash in cement manufacturing, it is not practised in India for various reasons,” a government committee noted in March this year.
It is estimated that by the end of 2025, India’s thermal power stations may generate 300 million tons fly ash annually.