High Cement Content Problems Tonawanda 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.

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Ajax Smith, Inc.
716 877-1126
4000 River Rd.
Tonawanda, NY
84 Lumber Co
(716) 695-0449
2286 Military Rd
Tonawanda, NY
Sanwal Technologies Inc
(716) 693-7201
4 Peuquet Pkwy
Tonawanda, NY
Liberty Architectural Prod
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Woodside, NY
Sugar Hill Home & Garden
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708 Saint Nicholas Ave
New York, NY
E J Militello Concrete Inc
(716) 636-2288
6465 Transit Rd
East Amherst, NY
DM Padovano Construction
716 553-7447
320 Irvington Dr
Tonawanda, NY
H B S Bldg Supls Inc
(716) 692-0084
595 Fillmore Ave
Tonawanda, 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

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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