Concrete Hyperplasticizers-CapcoCrete SPCR251

CapcoCrete SPCR251 is a hyperplasticizer, very effective water reducer, and retarder 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. It also prolongs the setting time and working time of concrete.

This product is manufactured in accordance with the general requirements of the Iranian national standard No.2930-1 and the performance requirements of tables 1-11 and 2-11 in the Iranian national standard No.2930-2. Additionally, this additive complies with the requirements of Grade G in ASTM C494 standard and table 1 of EN 934-1 standard, as well as the requirements of tables 1-11 and 2-11 in EN 934-2 standard.

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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 hot weather conditions.
  • • Production of self-compacting concrete.
  • • Production of high-flow concrete with the ability to maintain suitable slump.
  • • All types of concrete casting in hot weather.
  • • Production of concrete with a water-to-cement ratio less than 0.40 or without slump.
Range and Method of Using Additives in Concrete:

Permissible Range for Using Additives in Concrete:

The Permissible range for the use of SPCR 251 admixture is from 0.2 to 1.0% by weight of cementitious materials (200 to 1000 grams per hundred kilograms of cementitious materials including cement, silica fume, slag, fly ash, and other similar pozzolans). The optimal dosage of the admixture should be determined based on the mix design specifications and the site conditions, and ultimately, trial mixes should be prepared. Exceeding the specified limit may lead to consequences such as segregation, bleeding, and an abrupt increase in the setting time of concrete, especially for concretes containing retarding 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 of Concrete hyperplasticizer (CapcoCrete SPCR 251):
  • Physical State: Viscous Liquid
  • Color: Colorless to light brown
  • Chemical Base: Polycarboxylate ether
  • Density: 1.10 ± 0.02 g/cm³
  • Chloride Content: Negligible
  • Equivalent Alkali Content (Na₂O): 1.3 %
  • pH 6 ± 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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