High Cement Content Problems Hilton 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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Strober Building Supply
(631) 249-2400
1294 Broadhollow Rd
Farmingdale, NY
Dinaso & Sons Bldg Supls
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Hazel Blue Builders
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18427 Tudor Rd
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General Building Supply Corp
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2101 Kenmore Ave
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ADS Masonry
585-698-0756
1900 university ave
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Garcia Brothers Hardware
(212) 862-2426
2258 Adam Clayton Powell
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Stock Building Supply
(607) 433-1844
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Allied Building Supply Inc
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Lowes Home Improvement
(585) 453-7500
3150 Ridge Rd W
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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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