High Cement Content Problems Nyack 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.

Local Companies

K B Masonry LLC
(973) 831-0018
58 Townsend Road
Wanaque, NJ
The Home Depot Inc
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5700 Avenue U
Brooklyn, NY
315 W 35 Associates
(212) 594-1668
315 W 30th St
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Lowes Home Improvement Warehouse of Ulster
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901 Frank Sottile Blvd
Kingston, NY
Smith's True Value Hardware Lumber and Gifts
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Routes 5 & 20
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E C Hufnagel Landscaping Inc
(201) 869-5680
51 Broad Ave Apt 1
Fairview, NJ
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255 rich ave
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Petson Building Supply Inc
(914) 576-5100
39 Birch St
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(518) 377-0374
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Zamir Equities
(212) 269-7553
40 Broad St
New York, 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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