Effect of Shrinkage Reducing Admixture on the Shrinkage Behavior of High-Strength Concrete


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Title: Effect of Shrinkage Reducing Admixture on the Shrinkage Behavior of High-Strength Concrete

Author(s): Y. Yang, X. Ou, M. Chen, and W. Chen

Publication: Special Publication

Volume: 228


Appears on pages(s): 1329-1340

Keywords: autogenous shrinkage; drying; high-strength concrete;reducing shrinkage

Date: 6/1/2005

In this paper, a composite admixture for reducing shrinkage (CARS) was used to make high strength concrete (HSC) with a water-binder ratio of 0.25 for reducing shrinkage. The effectiveness of CARS on reduction of shrinkage was experimentally investigated, and the influence of CARS on the behavior of autogenous shrinkage and drying shrinkage strains in HSC under different curing conditions and replacement dosage of CARS are discussed. Furthermore, mechanical properties such as compressive strength and Young’s modulus of HSC with CARS were experimentally investigated, and compared with those of HSC without CARS. CARS is effective in reducing autogenous and drying shrinkage of HSC. When replacement dosages of CARS were 5% and 8% of the cement content, the autogenous shrinkage strains of concrete could be reduced by 25% and 50%, respectively; the drying shrinkage could be reduced by 22% and 34% when dried at the age of 3 days, and by 10% and 28% while drying started at the age of 7 days. Compressive strength of concrete at the age of 28 days was reduced by 7%-12% due to the addition of CARS, while Young’s modulus was reduced by 10%-15%.