Novel Slurry Rheology Modifier for Materials of Civil Engineering and Construction


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Title: Novel Slurry Rheology Modifier for Materials of Civil Engineering and Construction

Author(s): H. Yamamuro, K. Koyanagi, and T. Kojima

Publication: Special Publication

Volume: 239


Appears on pages(s): 137-150

Keywords: cement; concrete; segregation resistance; slurry rheology modifier; surfactants; viscoelasticity

Date: 10/1/2006

A novel slurry rheology modifier (VT) has been developed for slurry, mortar and concrete using an inorganic powder such as cement. This chemical admixture mainly consists of cationic and anionic surfactants. VT can efficiently exhibit unique viscoelasticity in spite of low molecular weight when the cationic and anionic surfactants coexist in slurry at the same time. This technology gives very good segregation resistance to cement slurry and concrete under several conditions, e.g., water, vibration, and high water-cement ratio and without setting retardation. The viscoelasticity mechanism of VT is caused by the formation of higher-order structure of surfactants in slurry. Controlling the viscoelasticity of VT is an effective method to prevent segregation for cement slurry, various grouts for repair and ground improvement. VT has various potential abilities in civil engineering and construction fields because of unique viscoelastic behavior.