This document summarizes research on the use of manufactured sand as a replacement for natural river sand in concrete. Manufactured sand is produced from crushing rock to form cubical particles, which can achieve consistent grading better than natural sand. Research has found that concrete made with manufactured sand has higher strength and durability than concrete with natural sand due to more effective particle packing. The document provides guidelines on proportioning concrete mixes using manufactured sand to achieve adequate workability and strength. Test results from one institute show that manufactured sand met sieve analysis and microfines requirements for use in concrete.