Structural repairs are meant to restore or increase the load-bearing capacity of a member. The only way this can be done is for the repair to contribute and withstand the loads applied. Whether this can be done depends on the properties of the chosen repair material. The elastic modulus and compressive strength are often viewed as the most critical characteristics since the compressive strength ensures the repair can withstand the stresses applied, while the elastic modulus determines the structural contribution of the repair. However, little attention is given to other long-term deformation characteristics, such as creep and shrinkage. Studies on the structural contribution of repairs to axially loaded members typically focus on the repair’s contribution at ultimate failure but do not focus on the contribution in the long term under service loads. This paper presents experimental work on the influence of shrinkage and creep of cementitious materials on repairs subjected to compressive axial loads. The paper describes the experimental work conducted, where unreinforced concrete prisms were exposed to shrinkage before the cross-section was partially replaced with a repair mortar or concrete and axially loaded after three days. Strains of the repaired section and concrete substrate over time are presented, and the effects of creep and shrinkage in the repair on the composite response to axial loading are discussed.