Aggregate is one of the most consumed raw material in the whole world. Its existence is essential for building roads and constructions. However, the global consumption of natural aggregate has raised concern about its availability in the future. Crushed aggregate is considered one of the most viable solution for this issue. Nevertheless, all of its effects on concrete must be evaluated. This is the object of this bachelor thesis. This study will examine properties of different types of aggregate and furthermore their influence on concrete properties such as slump and compressive strength. Moreover, the report will assess whether the current aggregate’s standard is suitable for crushed aggregate or not. Results from laboratory research and literature studies indicate that crushed aggregate with a higher content of fines than natural aggregate will decrease slump and workability. Furthermore, compressive strength of concrete will be reduced by applying crushed aggregate rather than natural aggregate. Finally, the aggregate standard, NS-EN 12620, is not completely suitable for crushed aggregate when it comes to measuring water absorption for crushed sand or defining reasonable requirements for fines content, flakiness index and Los Angeles value.