Concrete Hyperplasticizers-Capcocrete SPCA 251

Capcocrete SPCA 251 is a high-range water reducer, hyperplasticizer, and rapid-setting agent used to significantly enhance the flowability of concrete/mortar without altering the water-to-cement ratio. It can also be employed to reduce the water-to-cement ratio without compromising flowability. This additive also decreases setting time and increases the one-day compressive strength of hardened concrete.

This product is manufactured in accordance with the general requirements of the Iranian National Standard No. 2930-1 and the performance specifications outlined in Tables 6, 1-3, and 2-3 of the Iranian National Standard No. 2930-2. Additionally, this additive complies with the requirements of categories C and F in ASTM C494 standard, Table 1 of EN 934-1 standard, and Tables 6, 1-3, and 2-3 of EN 934-2 standard.

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Hyperplasticizers/ Very strong water reducer/ Accelerator (CapcoCrete SPCA251)

The advantages of using a concrete Hyperplasticizers include:
  • • Reducing the water-to-cement ratio in concrete results in uniform consistency and increased compressive strength at 28 days.
  • • Reduced water-to-cement ratio leads to decreased water absorption and permeability due to the reduction in water content relative to cementitious materials.
  • • Improved Cement Distribution, Enhanced Compaction Ability in Various Conditions, and Increased Compressive Strength at Equal Water-to-Cement Ratios.
  • • Improving the pumpability of concrete.
The use of concrete Hyperplasticizers:
  • • Production and implementation of reinforced and non-reinforced concrete in cold weather conditions.
  • • Production of highly flowable concrete mixes.
  • • All types of concrete pouring in cold weather conditions.
  • • Producing concrete with a water-to-cement ratio less than 0.40 and a slump value less than 2.
  • • Manufacturing precast concrete components under standard and accelerated curing conditions with steam.
Range and Method of Using Additives in Concrete:

Permissible Range for Using Additives in Concrete:

The permissible range for the use of CapcoCrete SPCA251 is from 0.2% to 0.8% by weight of cementitious materials (200 to 800 grams per one hundred kilograms of cementitious materials, including cement, silica fume, slag, fly ash, and other similar pozzolans). The optimal dosage of the additive should be determined based on the mix design specifications, operational conditions, and environmental factors. Testing should be conducted with trial mixes. Exceeding the specified limit may result in consequences such as segregation, bleeding, and rapid reduction in setting time, especially for concrete containing fast-setting cements.

How to Mix Concrete Hyperplasticizers:

To use the additive, it is necessary to dilute it with water at twice the volume of the additive, and then add it to the concrete. Additionally, the following points should be considered:

  • After adding the additive, the concrete should be thoroughly mixed for 2 to 5 minutes to ensure complete blending, and uniform distribution of the additive in the concrete.
  • This additive should not come into direct contact with dry cement or dry aggregate materials.
  • The volume of water used to dilute the additive (before adding it to the concrete) should be subtracted from the total mixing water in the concrete.
  • If there is a desire to significantly increase the slump of fresh concrete, it is necessary for the concrete mix design to be prepared in such a way that the concrete does not experience segregation and water bleeding.
Physical and Chemical Specifications
  • Physical State: Viscous Liquid
  • Color: Colorless to light brown
  • Chemical Base: Polycarboxylate ether
  • Density: 1.1 ± 0.02 g/cm³
  • Chloride Content: Negligible
  • Equivalent Alkali Content (Na₂O): 1.3 %
  • pH 7 ± 1
  • Freezing Point: -2°C
Safety Precautions When Using Concrete Hyperplasticizers:
  • • 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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