High Cement Content Problems Oneonta 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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Stock Building Supply
(607) 433-1844
E Oneonta Plz
Oneonta, NY
Butts L P Inc
(607) 432-6700
56 Market St
Oneonta, NY
Nunda Lumber & Hardware Inc
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11 N State St
Nunda, NY
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Floral Park, NY
Campbell Supply Co
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1016 Brand Blvd
Deer Park, NY
Patriot Masonry & Construction,Inc.
607-988-6561
81 Willow St
Otego, NY
Lowe's Home Improvement Warehouse of Oneonta
(607) 433-4000
5283 State Highway 23
Oneonta, NY
Pickett Building Materials
(607) 432-8391
6459 State Highway 23
Oneonta, NY
Allied Building Products Corp
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2130 5th Ave
Ronkonkoma, NY
Bisbee Lumber & Supply
(607) 637-2491
41 Yendes St
Hancock, 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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