Koteswara Rao D. Laboratory studies on the efficacy of Palm Oil Fuel Ash and Phosphogypsum for improving the properties of Expansive soil as subgrade for Flexible pavements. IJTIMES [Internet]. 2021 Oct. 22 [cited 2024 Dec. 23];6(10):06-1. Available from: https://ijtimes.com/index.php/ijtimes/article/view/76