MASTERAIR 108

MasterAir 108 is an air entraining admixture designed to in- crease durability of concrete structures against freeze/thaw cycles damages (exposure classes XF1-4 according to EN 206-1).MasterAir 108 provides durable concrete resistant to ice and frost by creating stable, small, closely spaced air bubbles system. Concrete durability research has established that the best protection for concrete from the adverse effects of freeze/thaw cycles and de-icing salts results from:
• proper air content in the hardened concrete;
• a suitable air-void system in terms of bubble size and spacing;
• adequate concrete strength, assuming the use of sound aggregates and proper mixing, placing, handling and curing techniques.

MasterAir 108 is free of chloride and meets UNI EN 934-2, UNI EN 480 (1-2), ASTM C 260 requirements.
According EN 206-1 the optimum air content must be in the range of 4-6%.

In order to optimise special requirements the use of the fol- lowing complementary is suggested:
• MasterGlenium or MasterRheobuild series superplasti- cizers in order to obtain higher concrete strength or to compensate the reduction of strength due to micro bubbles.
• silica fume MasterRoc MS 610 for high performance con- crete and improve durability in chemical aggressive envi- ronments (exposure classes XC1, XC2, XC3, XC4, XD1, XD2, XA1, XA2, XA3, XS2, XS3 according to UNI EN 206- 1 ed UNI 11104).
• synthetic micro-fibres MasterFiber 24 to prevent cracks due to plastic shrinkage.
• curing agent MasterKure against a too quick evaporation of mixing water, especially during summer conditions.

MasterAir 108 not to mix with admixtures of MasterSet or MasterPozzolith, MasterRheobuild and MasterG/e- nium //ne.

• High durable concrete structures against freeze/thaw cycles damages.
• Greatly improved stability of air-entrainment.
• Improved air-void system in hardened concrete.
• Reduced permeability.
• Increased watertightness.
• Reduced segregation and bleeding.
• Improved plasticity and workability of fresh concrete.
• Improved ability to entrain and retain air in low-slump con- crete, concrete containing high-carbon content fly ash, concrete containing large amounts of fine materials, concrete using high-alkali cements, high-temperature con- crete and concrete with extended mixing times.