AHEAD INTERNATIONAL JOURNAL OF RECENT RESEARCH REVIEW (AIJRRR) (www.aijrrr.com) Bangalore-560083, INDIA. Online ISSN: 2456-205X Impact Factor: 6.172 CERTIFICATE OF PUBLICATION This is to Certify that Mr./Mrs./Ms./Dr. Manoharan R, Rajkumar R, Akkineni Surya Teja has published research paper in " AHEAD International Journal of Recent Research Review (AIJRRR) peer reviewed and refereed journal, Volume- 1, Issue- 3, September 2016, pp. 72-79." Paper Title:- " STUDY ON COMPRESSIVE STRENGTH CHARACTERISTICS OF SPHERICAL HOLLOW CORE CEMENT CONCRETE BLOCKS USING FERRO SAND (COPPER SLAG) " Chief Editor Managing Editor