High Cement Content Problems Endicott 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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Campbell Building Supply
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RR 415
Campbell, NY
Doow Lumber Company
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5912 N Burdick St
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Hudson Building Supply
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Home Depot Inc the
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Hanson Aggregates New York Inc
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Portland Point Rd
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ABC Supply Inc
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C Itoh Bldg Prods
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660 White Plains Rd
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Newport Assoc
(212) 889-6882
236 E 36th St
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Stephenson Lumber Co Inc
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Chestertown Division
Chestertown, NY
Mechanics Building Materials
(212) 297-7800
65 Mall Dr
Commack, 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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