High Cement Content Problems Jacksonville FL

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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(904) 743-0807
1525 Romney St
Jacksonville, FL
 
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(904) 626-8358
5430 Dakota Dr
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Anderson Masonry Contractor Inc
(904) 268-1717
3768 Kori Rd
Jacksonville, FL
 
Brick IT Inc
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12637 Philips Hwy
Jacksonville, FL
 
Dedmon Masonry Inc
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1525 Romney St
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Charles Williamson Masonry
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814 7th Ave N
Jacksonville, FL
 
Doug's Masonry Inc
(904) 396-9206
6121 Collins Rd Lot 257
Jacksonville, FL
 
Arrow Brick
(904) 786-7555
723 Memorial Park Rd
Jacksonville, FL
 
Custom Concrete Inc
(904) 924-0006
11717 New Kings Rd
Jacksonville, FL
 

High Cement Content Problems

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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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