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AVOIDING PROBLEMS

Bondbreakers. AVOIDING PROBLEMS. Definition. DEFINITION. A bondbreaker is a material used to prevent adhesion of newly placed concrete and substrate. Most Common Causes of Bondbreaker Problems. Improper Cure of Slab Improper Finish on Slab Insufficient Application of Bondbreaker

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AVOIDING PROBLEMS

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  1. Bondbreakers AVOIDING PROBLEMS

  2. Definition DEFINITION • A bondbreaker is a material used to prevent adhesion of newly placed concrete and substrate

  3. Most Common Causes of Bondbreaker Problems • Improper Cure of Slab • Improper Finish on Slab • Insufficient Application of Bondbreaker • Uneven Application of Bondbreaker • Rain on Bondbreaker prior to drying • Not allowing Bondbreaker to completely dry • Hot Weather practices not followed • Improper Mixing This will Cause Panels to Stick

  4. Proper Cure of Slab THIS IS ESSENTIAL: • SLAB MUST BE CURED IMMEDIATELY AFTER FINISHING • USE AN ASTM C-309 CURING COMPOUND SUCH AS AN ACRYLIC • OR BONDBREAKER AS A CURE

  5. Curing of Slab – Option #1 • ACRYLIC or RESIN-BASED CURING COMPOUND • MEETS ASTM C-309 • APPLICATION RATE 200 SQ FT/GALLON

  6. Curing of Slab – Option #2 • USE BONDBREAKER AS CURE COAT • APPLY EVENLY AT 200 SQ FT/GAL

  7. Mixing Water-Based Bondbreaker • EACH DRUM HAS A INTREGAL MIXER • EACH DRUM HAS A MIXING HANDLE PROVIDED • USE SUPPLIED MIXER ONLY • DRUM MUST BE IN STANDING POSITION • MIX FOR MINIMUM OF 3 MINUTES • MIX BEFORE EACH USE (24 HR PERIOD) • ROLLING DRUM IS NOT PROPER MIXING

  8. Coverage Rates • ALWAYS FOLLOW RECOMMENDED APPLICATION COVERAGE RATES • CURE COAT 200 SQ.FT/gallon • 1st bond breaker coat = 400 SQ.FT/GAL • 2nd or additional bond breaker coat = 500-700 SQ.FT/GAL – Applied at right angles

  9. Coverage Rates • POROUS OR ROUGH CONCRETE WILL REQUIRE ADDITIONAL BONDBREAKER • BONDBREAKER RAINED ON PRIOR TO DRYING WILL REQUIRE AN ADDITIONAL COAT.

  10. Tests • PRESENCE OF BONDBREAKER CAN BE CHECKED • SOAPY FEEL TEST: VERIFIES PRESENCE OR BONDBREAKER, BUT NOT NECESSARILY SUFFICIENT COVERAGE • WATER BEAD TEST: WATER THAT READILY BEADS ON THE SURFACE USUALLY INDICATES THE SUFFICIENT PRESENCE OF BONDBREAKER

  11. Hot Weather Practices HOT WEATHER REQUIRES SPECIAL ATTENTION: • HOT WEATHER AIR TEMP > 90o F OR SLAB TEMP > 130oF • FLOOD SLAB TO SSD PRIOR TO APPLICATION OF BONDBREAKER... REMOVE EXCESS WATER.

  12. Weather Considerations • RAIN • RE-COAT IF NECESSARY • HOT / WINDY • INCREASE APPLICATION RATE • COMMENCE CURING IMMEDIATELY • FOG SLAB TO SSD PRIOR TO APPLICATION OF BONDBREAKER • COOL AND DAMP • MAY INCREASE DRYING TIME • MORE LIGHT COATS • ALLOW EACH COAT TO DRY THOROUGHLY

  13. Summary • BONDBREAKERS ARE OFTEN BLAMED FOR PROBLEMS RESULTING FROM POOR PROCESS • ALWAYS FOLLOW RECOMMENDED APPLICATION INSTRUCTIONS • BE AWARE OF WEATHER CONDITIONS • ALLOW EACH COAT TO DRY THOROUGHLY • TEST FOR PRESENSE OF BONDBREAKER • MISUSE OF BONDBREAKER REQUIRES EXPENSIVE REMEDIES • PROPER USE OF BONDBREAKER IS THE MOST CRITICAL PHASE OF TILT CONSTRUCTION

  14. Remember THE COST OF BONDBREAKER IS LOW COMPARED TO THE COST OF ONE STUCK PANEL

  15. Bondbreakers • SPEC TILT WB • CHEMICALLY REACTIVE WATER BASED • SPEC TILT EX • QUICK DRYING, EXEMPT SOLVENT, LOW VOC, SOLVENT-BASED

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