CSA Expansive agent - Shrinkage compensating cement additive

CSA Expansive agent / Cement additive / Shrinkage compensating cement additive 

High-efficiency CSA expansive agent is obtained by blending suitable natural anhydrite with a specially manufactured clinker which consists essentially of calcium sulphoaluminate and CaO. CSA expansive agent is always mixed with ordinary cement. When mixed in the proper proportions with ordinary cement and hydrated, cement mortar or concrete expands during the early stages of hydration. This expansion, when restrained, makes it possible to minimize drying shrinkage. Moreover, when the ratio of shrinkage reducing admixture to ordinary cement is increased its high expansion qualities make it ideal for use in prestressed concrete.

High-efficiency shrinkage reducing admixture is being used in all sections of the construction fields and by a wide variety of concrete products manufacturers.

Expansive Cement Additive is used to chemically pre-stress concrete, providing compensation for drying shrinkage, and reducing or even completely eliminating shrinkage cracks. It has the advantages of:

1. Allows for larger placements without control joints
2. Significantly reduces or eliminates shrinkage cracks
3. Greatly reduces number of control/construction joints
4. Greater freedom in the layout of concrete placements
5. Allows faster and simpler construction
6. Reduces surface maintenance


Characteristics of High-efficiency CSA Expansive Agent

Low alkalinity. High-efficiency CSA Expansive Agent has a very low alkali content (R2O < 0.3%) which is beneficial to avoid AAR in concrete.

Short stable stage of expansion. The stable stage of expansion is not more than 14 days, thus the ultimate strength of concrete is not affected.

Low dosage and high expansion capacity. The normal dosage of High-efficiency CSA Expansive Agent is 6~8% by the weight of ordinary cement, which is lower compared with other expansive additives such as UEA and CEA (their dosages are about 10~12% by the weight of cement) in the market.


Features by using High-efficiency CSA Expansive Agent

Prevents cracking due to drying shrinkage and hydration heats.

Increases the water tightness of concrete and thus is useful for waterproofing buildings.

Enables the manufacture of high strength concrete products through chemical prestressing.

1. reduced shrinkage
2. increased impermeability to water
3. increased mechanical strength
4. chemical pre-stressing
5. good adhesion to substrates and reinforcement and ease of handling.


For more informations, please contact my mail: csacement@gmail.com

Comments

  1. Shrinkage Reducing AdmixtureAugust 2, 2013 at 11:37 PM

    I think it qualifies as a hack, and a very creative one at that! Nice work!It's strange how this looks elegant given its put-together nature! Such a nice terminology of Shrinkage Reducing Admixture has to be display here.

    ReplyDelete
  2. UnknownMarch 3, 2019 at 5:21 AM

    What is Shelf life of CSA

    ReplyDelete

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