Research Article
Characterization and Degradation of Masonry Mortar in Historic Brick Structures
Table 3
Chemical analyses and other data for Fort Sumter mortars (total mortar of binder and aggregate).
| | Specimen | Number 5 bedding mortar above sea level | Number 6 pointing mortar above sea sevel | Number 11 bedding mortar above sea level | Number 3 bedding mortar below sea level | Number 15 building, below infill soil level |
| | CaO | 0.73 | 54.57 | 12.30 | 0.74 | 26.79 | | MgO | 9.20 | 15.53 | 5.05 | 0.72 | 11.59 | | Al2O3 | 1.21 | 2.84 | 0.96 | 1.75 | 2.00 | | SiO2 (Total) | 82.63 | 22.11 | 80.28 | 88.33 | 57.73 | | Fe2O3 | 4.31 | 1.94 | 1.76 | 5.11 | 1.83 | | TiO2 | 1.25 | 0.15 | <0.02 | 1.67 | 0.06 | | Na2O | <0.50 | 1.02 | <0.50 | <0.50 | <0.50 | | K2O | 0.70 | 1.83 | 0.14 | 1.68 | <0.05 | | Sum of constituents | 100.03 | 99.99 | 100.49 | 100.00 | 100.00 | | Insoluble residue, % | 60.74 | 16.20 | 76.48 | 65.21 | 48.15 | | XRD mineralogy | Calcite, quartz, sodalite | Calcite, quartz | Calcite, quartz, sylvite | Calcite, quartz, iowaite, bassanite, brucite | Calcite, quartz, epidote | | Soluble sodium or Na (ppm of solids) | 839 | 2092 | 149 | 2066 | 851 | | Soluble calcium or Ca (ppm of solids) | 3752 | 513 | 918 | 1807 | 3184 | | Soluble chloride or Cl (ppm of solids) | 1232 | 2706 | 148 | 5801 | 7406 | | Soluble sulfate or SO4 (ppm of solids) | 7218 | 1555 | 509 | 824 | 350 | Rough mix proportions by volume
cement : lime : sand | 1 : 2 : 4 | 1 : : | 1 : 4 : 9 | ND | 1 : 3.5 : 3 |
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