Over the past decade, a global emphasis has been placed on reducing carbon emissions, with the construction industry given particular attention in this regard. In reinforced concrete structures, one proposed method to reduce carbon emissions during manufacturing is to replace steel bars with fiber reinforced polymer (FRP) reinforcing bars. Accordingly, this study conducts flexural tests on concrete FRP (CFRP)-reinforced prefabricated slabs to investigate the joints between these slabs. The experimental variables include the types of connecting reinforcing bars used at the joints of two prefabricated slabs. The experimental results revealed the following: 1) the moment capacity of the slabs did not reach the nominal moment due to the insufficient length of the CFRP reinforcing bars, and 2) steel bars were found to be more suitable than CFRP reinforcing bars for connecting prefabricated slabs, as they promote ductile failure.