High Cement Content Problems Queensbury 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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Diamond Ready Mix Corp
(718) 447-4082
118 Greenfield Ave
Staten Island, NY
Outlet the
(315) 797-7017
1001 Broad St
Utica, NY
Barney & Dickenson Inc
(607) 729-1536
520 Prentice Rd
Vestal, NY
Kamco Supply Co
(516) 681-4969
850 S Oyster Bay Rd
Hicksville, NY
Moore's Lumber and Building Supplies
(315) 963-7418

Mexico, NY
Curtis Lumber Co Inc
(518) 792-8601
460 Big Bay Rd
Queensbury, NY
Ozone Park Lumber
(718) 843-5400
12324 Rockaway Blvd
Jamaica, NY
Caulktite Corp
(718) 624-4111
18 Delavan
Brooklyn, NY
Lowe's of Middletown
(845) 692-8044
700 N Galleria Dr
Middletown, NY
A L Building Supply
(718) 871-4500
890 Coney Island Ave
Brooklyn, 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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