BEHAVIOUR OF MASONRY BLOCKS USING SOIL, PHOSPHOGYPSUM AND STABILISED WITH DIFFERENT ADDITIVES, UNDER COMPRESSION AND IMPACT. Sadashiva Murthy1, Achyuth R B2, Sujith S3, Manjunath S B4, Varadmurthy Acharya B5 1Associate professor, The National Institute of Engineering, Mysore, Karnataka, India.