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Effect of air content on durability of cement-lime mortars

From National Research Council Canada

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  1. National Research Council of Canada
FormatText, Article
SubjectMortar; Concrete; cement lime mortar; durability; air entraining agents; freeze thaw cycles; air entraining cement; cement - lime mortars; types N, O and K; shrinkage; dry density; 1- and 24-h absorption; compressive strength; freeze-thaw cycling test
Abstract
A long-term study to assess the durability of cement-lime mortars with different air content levels has been carried out. Types N, O and K cement-lime mortars with air content levels increasing in 5% increments were studied; two air- entraining agents were used. Shrinkage, dry density, 1- and 24-h absorption, and compressive strength values were determined. Two-in. (5 cm) cubes were subjected to 150 cycles of a modified laboratory freeze-thaw cycling test and those that survived were placed on an outdoor exposure site for 10 years. Durability was assessed by physical deterioration, weight change and compressive strength values. Control cubes of mortar containing no air- entraining agent failed during laboratory freeze-thaw cycling. Cubes of types N and O mortar with moderate air content levels (10-15%) survived laboratory cycling and outdoor exposure with minor weight loss and moderate reduction in compressive strength. Reduction in compressive strength with increasing air content and differences between the two air-entraining agents are indicated.
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  • Durability of Building Materials 1 (1982): 23–34.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-1028
NRC numberNRCC 20148
NRC-IRC-2102
NPARC number20374920
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Record identifier68dfe310-654f-4416-bbd4-a495624f8daa
Record created2012-07-23
Record modified2023-12-18
Date modified: