The Microsilica Gel RB-MS375 is an advanced concrete admixture used for designing high performance concrete. This product contains Microsilica powder and polycarboxylate superplasticizer for improving performance. Microsilica Gel RB-MS375 maximize service life of structure by increasing concrete strength against physical, chemical, environmental and even internal destructive factors of concrete.

Standards: ASTM C1240-05


  • Different types of reinforced and unreinforced concrete structures
  • Waterproof concrete tanks and reservoirs.
  • Marine structures, water transfer channels and tunnels.
  • Heavy anti-radiant and explosion-proof structures.
  • Structures exposed to abrasion, bridge decks and parking structures.
  • Projects requiring decrease in concrete permeability for high-durability.
  • Projects requiring high-strength concrete to reduce dimensions of the structure elements or increase span length.
  • Structures requiring high elastic modulus.
  • Precast concrete elements.
  • Concrete requiring minimum electric conductivity.


  • Reduces water-cement ratio
  • Reduces cement content in concrete, at least 20 percent
  • Increases workability and workability retention of concrete
  • Increases flexural, tensile and compressive strength of concrete
  • Achieve to early compressive strength of concrete
  • Improves pumpability of concrete and reducing depreciation of concreting equipment
  • Improves concrete consistency
  • Enables economies in mix designs to be achieved when special conditions such as chemicals attack, dynamic load, etc.
  • Considerably reduces permeability
  • Increases durability of concrete
  • Reduce damages caused by lack of correct curing method
  • Increases the abrasion resistance of


RB-MS375 for concrete is available 25 kg packages.


  • Appearance: Slurry
  • Color: Grey
  • Specific gravity: 1.3 g/cm3
  • Chlorine: according to standard


The optimum dosage of Microsilica Gel RB-MS375 can be determined by trials in the site. Depending on concrete mix design (concrete type, workability, compressive strength, sizes and types of aggregates, cement content, water/cement ratio, ambient temperature and concreting conditions), a dosage of between 2 and 7 percent by weight of cement is recommended. For use with other range of dosage, contact RBBCO Technical Services Department.


Add 2% to 7% of total cement, RB-MS375 to concrete. RB- MS375 gel can be added at the time of concrete making in batching or after concrete making in truck mixer. If RB-MS375 gel is added in to truck mixer, be sure of complete mixture of gel and concrete. According to experimental results RB-MS375 gel should be mixed in truck mixer for 2-5 minutes. To get the best result, use RB-MS375 in two stages. One part of gel into batching and another part as a reminder dose should be added to truck mixer 5 minutes before using.

RB-MS375 gel can be added to concrete in two ways:

RB-MS375 gel could be added to ready-mix concrete before placing concrete. RB-MS375 microsilica could be added to a part or whole of concrete mixing water then added to the concrete mix.


Shelf life: 1 year in the original package Storage condition: should be protected from direct sunlight and frost. Keep pail in the temperature range between +5°C and +35°C


Microsilica Gel RB-MS375 is not flammable and does not threaten user’s health, but probable splash should be immediately washed by cold water.


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