Properties of New Polysaccharide as a Thickener for Concrete
T. Izumi, S. Dikty, and H. Yamamuro
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polysaccharide derivative; self-compacting concrete; thickener
A new polysaccharide derivative (NPD) is a thickener that has ionic functional groups and hydrophobic ones. This molecular structure generates unique properties , . Generally current common thickeners like cellulose derivatives are much affected by variety and quantity of inorganic metallic ions dissolved from cement. The solubility of thickeners tends to decrease due to metallic ions. Therefore, under ion-exchanged water they add viscosity to water effectively, but the viscous property would be reduced with increase of metallic ions. On the other hand, NPD shows an opposite behaviour. As the concentration of inorganic salt such as NaCl increases, the viscosity of NPD aqueous solution rises significantly . It is supposed that the formation of network structures generated by associating hydrophobic groups in the presence of metallic ions would cause excellent thickening ability. It is expected that NPD will be utilized as a thickener for self-compacting concrete and for anti-segregation in common concrete. Moreover, it is possible to make a so-called two in one product that owns both dispersability and viscous ability, because NPD is mixed with a superplasticizer easily without increasing solution viscosity.