International Concrete Abstracts Portal

Title: Properties of High-Strength Concrete With Silica Fume Using High-Range Water-Reducer of Slump Retaining Type

Author(s): K. Mitsui, H. Kasami, Y. Yoshioka, and M. Kinoshita

Publication: Special Publication

Volume: 119

Issue:

Appears on pages(s): 79-98

Keywords: admixtures; carbonation; compressive strength; freeze-thaw durability; high-strength concretes; modulus of elasticity; shrinkage; silica fume; water-reducing agents; workability; Materials Research

Date: 9/1/1989

Abstract:
Gives results of laboratory investigations to determine the effect of a slump-retaining-type high-range water reducer. Various effects such as temperature, mix proportions, and admixture dosages on rheological and mechanical properties of concrete before and after hardening of concrete were examined. Slump, air content, and flow were tested after mixing. Setting time and bleeding were also measured. The hardened concrete was tested for strength, modulus of elasticity, shrinkage, and durability. The results indicated that it was possible to produce workable high-strength concrete and retain its workability by the admixture better than conventional superplasticizers. Higher temperature at mixing resulted in the retention of high workability. Too much admixture delayed the setting time, while no other adverse effects were noticed on mechanical properties of hardened concrete.