IWR (Integral Water Repellent Mortar)
SPEC MIX® Integral Water Repellent (IWR) Mortar is specially formulated to reduce water penetration and efflorescence of masonry mortar joints. By incorporating a proprietary, dry polymeric integral water repellent admixture during the SPEC MIX manufacturing process, the designer, specifier, owner and contractor are assured the mortar on their project will repel moisture,while maintaining optimal workability and flexural bond strength. When using ASTM C 1357 “Standard Test Methods for Evaluating Masonry Bond Strength” to compare the flexural bond strength of SPEC MIX IWR Mortar to the same reference mortar mixed with liquid admixture as typically added in the field, SPEC MIX IWR Mortar demonstrated a 46 percent increase in bond strength.
PRODUCT FEATURES
• IWR Mortar is effective and comparable to mortars utilizing a liquid water repellent admixture
• Exceeded the flexural bond strength of mortar made with a liquid admixture by more than 40 percent
• Provided greater resistance to water penetration than reference mortar
• Created a water repellent masonry assemblage when used with water repellent treated units
• Demonstrated 7 and 28 day compressive strengths similar to the reference mortar. SPEC MIX® IWR Mortar is available in 80 lb. (36.3 kg.) packages for easy hand loading or in 3,000 lb. (1,360.8 kg.) reusable bulk bags to be used with the various SPEC MIX® silo systems
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SPEC MIX IWR Mortar Test Results: Flexural Bond and Water Penetration Study
• SPEC MIX IWR Mortar, utilizing a dry polymeric integral water repellent admixture, was as effective and comparable to mortars containing a nationally recognized, proprietary liquid water repellent admixture.
• The flexural bond strength of the SPEC MIX IWR Mortar significantly exceeded the bond strength results of a similar mortar mixture containing a nationally recognized proprietary liquid water repellent admixture.
• SPEC MIX IWR Mortar and a mortar containing a nationally recognized proprietary liquid water repellent admixture both provided greater resistances to water penetration than the reference mortar when tested in accordance with ASTM E 514.
• SPEC MIX IWR Mortar made with a dry integral water repellent admixture, when used with water repellent treated units, creates a water repellent masonry assemblage when properly designed and constructed.
• The 7 and 28 day compressive strengths of the SPEC MIX IWR Mortar were similar to that of the reference mortar.
| EXAMPLE PERFORMANCE PROPERTIES - TYPE S | ||
|---|---|---|
| Reference Type S Masonry Mortar | TYPE S Masonry Mortar with IWR Admixture | |
| ASTM C 270 | ||
| Water Retention | 86% | 86% |
| Air | 15.8% | 15.3% |
| 7-Day Compression Strength | 1570 psi | 1600 psi |
| 28-Day Compressive Strength | 1950 psi | 2040 psi |
| ASTM E 514 | ||
| Time of First Dampness | 38 min | None |
| Time of First Visible Water | None | None |
| Area of Dampness (% of test area) | 12% | None |
| Water Collected in 4 Hours | None | None |
