Use of Acryl-Type Polymer as Admixture for Underwater Concrete


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Title: Use of Acryl-Type Polymer as Admixture for Underwater Concrete

Author(s): M. Sakuta, Y. Yoshioka, and T. Kaya

Publication: Special Publication

Volume: 89


Appears on pages(s): 261-278

Keywords: acrylic resins; aluminum sulfate; compressive-strength; deterioration; polymer-portland cement-concrete; viscosity; underwater construction.

Date: 12/1/1985

The quality deterioration of underwater concretes may be caused mainly by the washout of the cement from the concrete. The addition of an acryl-type polymer to concrete was found to be effective to prevent such deterioration. With the increase of the polymer content, the resistance of the concrete to be sepa-rated in water improved. This polymer did not affect the hydra-tion of the cement. A dialdehyde-type auxiliary agent was found to be effective to improve the function of the polymer at a dosage of only 1% of the polymer when it was added to the con-crete after the addition of the polymer. Due to the high vis-cosity of the concrete containing the polymer, the cleaning operation of equipment such as concrete pumps and mixers tends to be time-consuming. To avoid this, an alminum compound was found to be useful when it was added to the equipment together with water. Through the action of the alminum compound the concrete left in the equipment lost its viscosity immediately, flocculated and precipitated. By the field test in which concretes contain-ing polymer were applied to a underwater concrete structure, the performance of the polymer was confirmed.