High Cement Content Problems Mastic 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

Cb Richard Ellis
(212) 269-7553
50 Broadway Pb
New York, NY
Madden Concrete
(315) 866-3868
602 W Steele St
Herkimer, NY
Home Depot the
(585) 223-2510
Eastview Mall
Victor, NY
Perry's Brick Co Inc
(718) 448-5050
221 Arlington Ave
Staten Island, NY
Garlock Lumber & Hardware
(315) 482-2521
15 Washington St
Alexandria Bay, NY
Smitty's Home Center
(631) 281-8744
211 Mastic Beach Rd
Mastic, NY
Alpine Building Supply
(315) 497-1221
1600 State Route 38
Moravia, NY
Family Lumber
(516) 735-5100
140 Stewart Ave
Bethpage, NY
Ghent Wood Products
(518) 828-5684
RR 66
Ghent, NY
Liberty Architectural Prod
(718) 205-9899
3714 61st St
Woodside, 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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