Using lightweight aggregate mortar for building reinforcement systems was investigated in this research. The main purpose of the study was to evaluate the bond between rebars and lightweight mortar. This research also evaluated the effect of different strategies for reinforcing structures.
Several factors influence the rheological behavior of lightweight mortar. One of them is the insertion of fibers. The fibers can be aligned unidirectionally or be inserted vertically. In this experiment, the fibers were inserted vertically. Depending on the position of the fibers, voids could form around the rebars.
The insertion of the reinforcement was done manually. This can lead to a large variation in the amount of fibers. Automatized insertion can reduce this variation. It can also be done with better accuracy and precision.
After insertion, the fibers were turned. This can increase the mechanical performance of the resulting structure. Also, the flexural strength can be increased by the use of fibers.
The flexural strength of the tested specimens ranged from 1.9 N/mm2 to 3.3 N/mm2. The results showed a higher flexural strength when the fibers were inserted in the lower layers. Besides, the fibers have a directional effect on the layer bond.
A horizontally deposited rebar increased the flexural strength by 600%. Despite the higher flexural strength, the rebars still required a high force to be inserted. Therefore, the flexural strength of the test specimens was affected by the rheology of the mortar.
Furthermore, the flexural strength of the tested specimens was assessed in pull-out tests. The pull-out tests showed that there was a high variability in the length of the protruding fiber.