Pozzolanic Products-CapcoGel FD

Supplementary Materials Containing Silica Fume and Water-Reducing Admixture and Polypropylene Fibers (CapcoGel FD)

CapcoGel FD is a supplementary material containing microsilica with strong pozzolanic properties, along with a superplasticizer additive and polypropylene fibers. It is used to increase the flowability of concrete/mortar without changing the water-to-cement ratio or to reduce the water-to-cement ratio without reducing flowability. This product reacts with calcium hydroxide resulting from hydration due to its strong pozzolanic properties. The secondary products of pozzolanic reactions reduce the permeability of concrete and improve its mechanical strength and abrasion resistance. Additionally, the fibers present in it help control potential cracks caused by plastic shrinkage in concrete.

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The microsilica present in this product complies with the general requirements of the Iranian National Standard No. 13278 and the specifications mentioned in ASTM C1240 and EN 13263-1 standards. Additionally, the superplasticizer in this product also complies with the performance requirements outlined in Tables 1-3 and 2-3 of the Iranian National Standard No.2930-2 and the requirements of Grade F in ASTM C494 standard and Tables 1-3 and 2-3 of EN 934-2 standard.

The advantages of using a concrete CapcoGel FD include:
  • • Reducing the water-to-cement ratio in an equal consistency and increasing the 7-day and 28-day compressive strengths
  • • A better distribution of the cement, improving compaction in different conditions and increasing the compressive strength in an equal water-to-cement ratio
  • • Reducing the water penetration and permeability due to a reduction in the waterto-cement ratio and the silica fume in the supplementary material
  • • Controlling the crack due to plastic shrinkage
  • • Reducing the risk of corrosion of the bars in chloride environments
  • • Reducing the risk of developing alkali-silica reactions
  • • Reducing the risk of expansion due to sulfate ion
  • • Easy carrying and storing without making dust in the production site, as well as adhering to sanitation and protecting personnel’s health
The usage of CapcoGel FD:
  • • Different types of concrete structures
  • • The production of ready-to-use high-strength concrete
  • • The production of pre-cast high-strength concrete
  • • The implementation of concrete in industrial high-strength floors
  • • The production and implementation of wet shotcrete
  • • The production of concrete with water-to-cement ratios between 0.35 and 0.45
Range and Method of Using CapcoGel FD in Concrete:

Permissible Range for Using CapcoGel FD in Concrete

The Permissible range for using The CapcoGel FD is from 8% to 18% of the cement material weight (8 to 18 kg per 100 kg of cement content including cement, silica fume, slag, fly ash, and other similar pozzolans). Specifying the optimum amount of the admixture should be accomplished with respect to the properties of the mix design and the implementation and weather conditions, and finally making the test mixes. The excessive use of admixture may result in the separation of components and concrete bleeding as well as the excessive increase in the concrete setting time, especially for concrete containing slow-setting cement. It is necessary to obtain the minimum amount of using supplementary material in the laboratory in case of using reactive silica aggregates in concrete.

How to Mix CapcoGel FD with concrete:

The CapcoGel FD must be added to the concrete while mixing other components in the batching plant. It is also necessary to take the following tips into consideration:

  • Mix the concrete for 2 to 5 minutes after adding the admixture and assure the uniform distribution of the admixture in the concrete.
  • Avoid the direct contact of the admixture with the dry cement and aggregates
  • Subtract 50% of the supplementary material weight from the mixing water of the concrete.
Physical and Chemical Specifications of CapcoGel FD:
  • Physical state: Thixotropic Gel
  • Gel color: Dark gray
  • The water content in the gel: 50%
  • Microsilica content in the gel: 40%
  • Type of Fibers of the Gel: Polypropylene
  • Size of the Fibers of the Gel: 12 mm
  • 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 FD:
  • • 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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