THE STUDY OF HYDROXYAPATITE IN CLAMSHELL TO ENHANCE THE QUALITY OF BRICKS

Abstract

This study is to add hydroxyapatite in clamshell as an additive inside the concrete brick. The objective of this study is to determine that hydroxyapatite can help to produce better quality concrete bricks in terms of its strength and infiltration rate. The scope of research for these projects is the strength of the bricks and the infiltration rate after adding Hydroxyapatite, a comparison between burnt brick and brick that contains Hydroxyapatite which is produced without burning it, the synthesis of calcium carbonate to calcium phosphate and the characteristic of the shell. The ratio of Hydroxyapatite in making a complete brick is 1:2:4:1. The ratio of cement, sand, aggregate, and water is fixed so that the product will not be disturbed by other mixtures while the ratio of Hydroxyapatite changed on each mold where mixture A 100 g HAp, B 200g HAp, C 300g HAp. It can be seen that bricks that contain HAp slurry in the range of 100g of HAp have a lower infiltration rate than concrete brick points that do not contain HAp while in terms of strength, bricks that contain HAp slurry have lower strength compared to the control brick point, but still within the target strength which in range of 43.94 N/mm².

Keywords: concrete bricks, hydroxyapatite, clamshell, strength, additive

JEL Classification: 0009-0006-1466-2605, 0009-0001-8265-1514