Pozzolanic Products-CapcoGel DR

Supplementary Materials Containing Silica Fume and Water-Reducing Admixture (CapcoGel DR)

CapcoGel DR is a supplementary material containing microsilica with strong pozzolanic properties, along with a powerful superplasticizer and water reducer. It is used to increase the flowability of concrete/mortar without changing the water-to-cement ratio or to decrease the water-to-cement ratio without reducing flowability. This product reacts with calcium hydroxide resulting from hydration due to its strong pozzolanic characteristics. The secondary products of this pozzolanic reaction reduce the permeability of concrete, enhancing its mechanical strength and abrasion resistance.

The microsilica present in this product complies with the general requirements of the Iranian National Standard No. 13278 and the specifications outlined in ASTM C1240 and EN 13263-1 standards. Additionally, this additive conforms to the requirements of ASTM C494 Grade G standard and Table 1 of EN 934-1 standard, as well as the requirements of Tables 1-11 and 2-11 of EN 934-2 standard.

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The advantages of using a concrete CapcoGel DR include:
  • • Reducing the water-to-cement ratio in concrete results in uniform consistency and increased compressive strength at 7 and 28 days.
  • • Improved Cement Distribution, Enhanced Compaction Ability in Various Conditions, and Increased Compressive Strength at Equal Water-to-Cement Ratios.
  • • Significant reduction in water absorption and permeability is achieved due to the decrease in the water-to-cement ratio and the presence of microsilica in the additive material.
  • • Reduced risk of corrosion for reinforcement bars in chloride environments.
  • • Reduced risk of alkali-silica reactions.
  • • Reducing the risk of expansion due to sulfate ions.
  • • Easy transportation, storage, and usage without generating dust on the production and construction site, along with adhering to health and safety principles to protect the personnel's well-being.
The usage of CapcoGel DR:
  • • All types of Concrete Structures
  • • Production of High-Strength Ready-Mix Concrete
  • • Production of High-Strength Precast Components
  • • Installation of Industrial and High-Strength Concrete Floors
  • • Production and Application of Shotcrete
  • • Production of Low Permeability Concrete
  • • Production of Concrete in Areas with Moderate to High Corrosion Risk
  • • Producing concrete with a water-to-cement ratio between 0.4 to 0.45.
Range and Method of Using CapcoGel DR in Concrete:

Permissible Range for Using CapcoGel DR in Concrete

The permissible range for using CapcoGel DR is from 8 to 18 percent of the weight of cementitious materials (8 to 18 kilograms per hundred kilograms of cementitious materials, including cement, silica fume, slag, fly ash, and other similar pozzolanic materials). The optimal amount of this additive should be determined based on the mix design specifications, operational conditions, and environmental factors. Exceeding the specified limit may result in consequences such as segregation, water bleeding, and an abrupt increase in the setting time of concrete, especially for concrete containing retarder cements. If reactive silica aggregates are present in the concrete, the minimum amount of the additive should be determined in the laboratory.

How to Mix CapcoGel DR with concrete:

CapcoGel DR should be added to the concrete mix at the batching plant and during the mixing of concrete components. Additionally, the following points should be observed:

  • After adding the additive, the concrete should be thoroughly mixed for 2 to 5 minutes, ensuring uniform distribution of the additive throughout the concrete.
  • This additive should not come into direct contact with dry cement or dry aggregates.
  • 55% of the weight of this additive should be subtracted from the mixing water used for the concrete.
Physical and Chemical Specifications of CapcoGel DR:
  • Physical state: Gel
  • Gel color: Dark gray
  • Microsilica content in the gel: 40%
  • Chemical base of the superplasticizer in the gel: Polycarboxylate ether
  • Density: 1.30 ± 0.02 g/cm³
  • Chloride content: Negligible
  • Alkaline materials equivalent (Na₂O): Negligible
  • pH: 7 ± 1
  • Freezing point: 0 degrees Celsius
Safety Precautions When Using CapcoGel DR:
  • • This product should not be poured in the working environment. After drying, it can contaminate the surrounding air with airborne particles, making breathing in this environment hazardous.
  • • In case of contact with this additive in the eyes, the person should rinse the eyes with water for at least 15 minutes, keeping the eyelids open.
  • • In case of contact with this additive on the skin, promptly wash the contaminated skin with clean water for 15 minutes.
  • • Contaminated clothing should be washed with appropriate cleaning agents before reuse.
  • • If the affected person continues to experience discomfort, it is necessary to seek medical attention promptly.
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