High Cement Content Problems New Hartford 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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Lord & Winn Lmbr
(315) 675-3589
247 County Route 17
Bernhards Bay, NY
Advantage Wholesale Supply
(718) 292-7300
962 Washington Ave
Bronx, NY
Home Depot the
(516) 488-8500
600 Hempstead Tpke
Floral Park, NY
ABC Supply Company Inc
(845) 483-7280
900 Dutchess Tpke
Poughkeepsie, NY
Skibitsky's Lumbertown
(845) 457-5300
917 State Route 17K
Montgomery, NY
Brown Builders Supply Co
(516) 488-2700
1700 Plaza Ave
New Hyde Park, NY
Smith Lumber & Hardware Center
(585) 346-5705
5833 Big Tree Rd
Lakeville, NY
Home Depot Inc the
(718) 558-8640
9230 168th Pl
Jamaica, NY
Condon M L Co Inc
(845) 221-8966
55 S Greenhaven Rd
Stormville, NY
Advanced Repair Technology
(607) 264-9040
268 Van Dusenville Rd
Cherry Valley, 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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