This document is an investigatory chemistry project on the setting of cement. It was completed by Arpit Singh, a class 12 student at Kendriya Vidyalaya No. 1 in Kanpur, India under the guidance of his chemistry teacher, Mrs. Rashmi Singh. The project examines how the quality of sand, addition of fly ash or lime, and time impact the setting and strength of cement mixtures. It describes the materials, procedures, observations, and conclusions of an experiment where cement mixtures of different compositions were allowed to set for 3, 7, and 10 days and then tested for their minimum breaking strength.