High Cement Content Problems Mastic 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

Myles F Kelly
(631) 752-0704
2099 New Hwy
Farmingdale, NY
Kwok and Jie Inc
(212) 431-5558
123 Chrystie St
New York, NY
Peters L D & Sons Inc
(914) 576-5100
39 Birch St
New Rochelle, NY
Lemle & Wolff Building Mgt
(212) 304-3890
125 Vermilyea Ave
New York, NY
Matthews & Fields Lumber
(585) 334-5500
1230 Lehigh Station Rd
Henrietta, NY
Smitty's Home Center
(631) 281-8744
211 Mastic Beach Rd
Mastic, NY
Beckerle Lumber Supply Co Inc
(845) 942-1492
59 Westside Ave
Haverstraw, NY
Silver Stones
(718) 592-1697
9015 Queens Blvd
Flushing, NY
Panel World
(718) 332-1700
2604 Coney Island Ave
Brooklyn, NY
84 Lumber Co
(607) 257-8484
1818 Hanshaw Rd
Ithaca, 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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