High Cement Content Problems Ithaca NY

Portland cement gives a mortar added durability, high early strength, a consistent hardening rate, and high compressive and bond strengths. However, mortar with excessively high cement contents can affect water permeability and durability of the masonry.

Local Companies

Hep Sales
(607) 347-4177
12 Utility Dr
Ithaca, NY
R K L Bldg Specialties Co Inc
(718) 728-7788
2393 48th Ave
Long Island City, NY
King Lumber
(914) 232-5151
2 Mandia Ln
Goldens Bridge, NY
Grossman's Bargain Outlet
(585) 243-2620
4101 Lakeville Rd
Geneseo, NY
Flushing Office Center
(718) 888-9707
13656 39th Ave
Flushing, NY
84 Lumber Co
(607) 257-8484
1818 Hanshaw Rd
Ithaca, NY
Cayuga Lumber
(607) 273-0245
801 W State St
Ithaca, NY
Lakeland Lumber Corp
(914) 245-5050
E Main
Shrub Oak, NY
Burt Lumber
(631) 421-4444
51 W Hills Rd
Huntington Station, NY
84 Lumber Co
(845) 567-0008
21 Pomarico Dr
Newburgh, NY

Provided By:

Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: December 1, 1990


Portland cement gives a mortar added durability, high early strength, a consistent hardening rate, and high compressive and bond strengths. However, mortar with excessively high cement contents can affect water permeability and durability of the masonry. Water permeability is increased for three reasons. First, mortars with high cement content have greater shrinkage and more frequent shrinkage cracks. Shrinkage cracking often takes the form of evenly spaced vertical cracks in bed joints and evenly spaced horizontal cracks in head joints. The mortar may also separate or pull away from the body of the brick at the bond interface. Although high cement content mortar itself is less permeable, water can penetrate the shrinkage cracks. The second reason that high cement content mortars may increase water permeance is that these mortars are stiff and not easily workable. Because of this, good bond may not be achieved at the time of construction. Finally, the high strength (high cement content) mortars are hard (brittle) and don't easily accommodate movement of the masonry (due to environmental changes or foundation settlement) and therefore may result in cracking of the masonry wall. Cracks make the walls more susceptible to freeze-thaw deterioration even though hi...

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