Analytical insight to explore the behavior of neem gum modified NHL 3.5 mortar Durgadevagi Shanmugavel, Mohamed Amine Khadimallah and Ravi Ramadoss Eur. Phys. J. Plus, 137 7 (2022) 775 Published online: 06 July 2022 DOI: 10.1140/epjp/s13360-022-02985-0