Shrinkage-reducing agent

Fujiwara, H., Tomita, R. and Shimoyama, Y. (1994). A Study of the Frost Resistence of Concrete Using an Organic Shrinkage Reducing Agent, ACI SP-145-34, 643-55. 

Two types of commercially available shrinkage-reducing agents (SR) were used. They were produced by dissolving polystyrene in... 

Figure 7. Relationship between curing time and length change of UP-1 resin concrete with various contents of shrinkage-reducing agents...

Figure 9. Content of shrinkage-reducing agent vs. 24-hr length change of polyester resin concrete...

Development of the effective powdered shrinkage-reducing agents and antifoamers for one-packaged polymer-modified mortar (dry premix mortar or dry mix mortar) products using redispersible polymer powders [61]... 

Y. Ohama and S. Matsumoto Effect of type of powdered antifoamer on properties of polymer-modified mortars using redispersible polymer powders with powdered shrinkage-reducing agent, in Proceedings of the 4th Asia Symposium on Polymers in Concrete, Kangwon National University, Chuncheon, Korea (2003), pp.81-87. 

Berke et al. [106] were able to increase the amount of air entrained in cementitious compositions by use of tiiblock surfactants. Increasing the amount of air in cement is advantageous, since it leads to increased resistance to frost attack and deterioration due to repeated freezing and thawing. Many shrinkage-reducing agents added to cement reduce the amount of entrained air. 

However, it is felt that the intrinsic property of most water-reducing admixtures is to increase the creep and shrinkage of the concretes into which they are incorporated. This is minimized by utilizing the effect of the admixture to reduce the cement and, therefore, the paste content of the mix. For corresponding mixes with lignosulfonate water-reducing agents, the FIP/CEB recommendation for creep computation can be used with confidence because of the incorporation of a cement content/water-cement ratio function in the calculation. 

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