Abstract
It has been reported that suitable quantity of the viscosity agent welan gum, a kind of natural water soluble polysaccharide, is very effective for stabilizing the rheological property of highly fludized concrete. In this paper, we have just studied basic properties of welan gum experimentally and effect of welan gum on fresh concrete such as self-consolidating property. As a result, we understand that viscosity of welan gum's water solution. is not affected by calcium-concentration and pH, except for a little bit high viscosity in alkaline solution. And we learned that it stabilizes the rheological property and mobility in small space of highly fluidized concrete to apply suitable quantity of welan gum for concrete, in addition, the product provides long term stability and improves self-consolidating property in wide range of slump-flow. We made clear partially how the product provides these effects.
