The research on concrete is currently developing very rapidly. One of them is research on concrete with micro reinforcement. This study aims to find out how much influence the variations in micro reinforcement used have on the strength of concrete. This study was conducted with variations in the percentage of addition of micro reinforcement with various types of micro reinforcement. In this study, FTIR analysis was also carried out to determine the absorption area and group of micro reinforcement compounds. The micro reinforcement used is Jute, Bamboo, Rattan and Plastic with an additional percentage of 0.5%; 1%; 1.5% and 2% against the weight of cement. The test was performed at the age of 28 days, with a compressive strength test. The results showed that there was a significant influence on the compressive strength of non-micro reinforcing concrete compared to micro reinforcing concrete. The optimal compressive strength of concrete with the addition of micro reinforcement (Bamboo/Rattan) was obtained in concrete with a percentage of 1.5% with an optimum compressive strength of 23.31 MPa, plastic reinforcement 22.93 MPa (addition of 1.5%), rattan micro reinforcement 22.93 MPa (addition of 2%), and hemp micro reinforcement (addition of 2%) 20,665 MPa. The results of the FTIR analysis form of the compound group and the most optimal absorption area in micro reinforcement micro-compound groups of bamboo and rattan reinforcement has 3 peaks with the form O – H, C – H and CH2. When compared to compound groups in concrete without micro reinforcement, it only has 2 compound groups, namely, O – H and CH2 only.
