Characterization and Degradation of Masonry Mortar in Historic Brick Structures

Table 1

Chemical analysis of Rosendale cement.

Species	Historic reference 1 [10]	Historic reference 2 [11]	Modern Rosendale [12]	Contemporary Rosendale	Insoluble residue, contemporary Rosendale
CaO	27.8	33–60	35.3	46.3	1.1
MgO		12–21	19.2	22.8	0.3
Al2O3	5.5	5.5–10	5.5	4.3	8.3
SiO2	27.8	27–33	34.2	23.0	84.0
Fe2O3	4.3		2.6	1.8	1.5
TiO2			0.3	0.1	0.2
Na2O			0.5	0	1.6
K2O			2.2	1.8	2.9
Sum of constituents			99.8	100.1	99.9
Cementation index (CI)			1.66	0.90