Evaluation of Mortar from Historical Building
Short write up:
Prior to rehabilitating this historic building, stakeholders wanted to determine the condition of the mortar used to bind the bricks and obtain any pertinent information to assist the repair effort.
Petrographic analysis of the mortar showed significant irregularly shaped fissures/cracks in an otherwise dense low water content paste. Residual gelatinous hydration product was also noted in the voids of mortar. The mortar was completely carbonated as expected.
The average sand content in the mortar was estimated at about 65%; the combined cement and colored pigment at about 35%.