High Cement Content Problems Corning 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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E G P Corp
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5 White Birch Rd
Shelter Island, NY
Lowe's Home Improvement Warehouse of Farmingdale
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90 Price Pkwy
Farmingdale, NY
Stock Building Supply
(607) 563-2131
101 Main St
Sidney, NY
Wilcox A H & Son
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212 S Main St
Naples, NY
Home Mason Supl Corp
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400 Central Ave
Peekskill, NY
Franklin Building Supply
(718) 857-6650
1155 Fulton St
Brooklyn, NY
Lowe's Home Improvement Warehouse of Oneonta
(607) 433-4000
5283 State Highway 23
Oneonta, NY
Acra Bldg Supplies
(518) 622-9649
Main
Cairo, NY
T & K Lumber Co
(315) 689-3005
RR 5
Elbridge, NY
Vent-Co
(716) 795-9221
9017 Lake Rd
Barker, 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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