Mechanical Characteristics of Mortar Containing Low Polymer Proportions as Patch Repair Material

Keywords: compressive strength, flexural strength, patch repair, polymer, slant shear.

SA Kristiawan, Sunarmasto
LPPM UNS, Penelitian, DP2M, Hibah Bersaing, 2009

Degradation of reinforced concrete is a persistent problem that has been experienced in many countries due to a variety of causes. Many methods of repair have been developed to extend service life of this degraded reinforced concrete. Patch repair, for example, is a simple method that has been applied to recover the size and appearence of spalled or delaminated reinforced concrete. Application of this method requires a material that should be compatible with the existing concrete. This research is an attempt to develop such material using low proportions of polymer to modify mortar. At this stage, the research focus on investigation of their mechanical characteristics: compressive strength, flexural strength and slant shear. These basic parameters determine the minimum requirements of patch repair material performance in its application. The results of investigation show that with minimum proportions of polymer (about 2-4%), the minimum requirements of 28-day compressive strength, flexural strength and slant shear are achievable for patch repairing degraded concrete with strength of 20-30 MPa.