EFFECT OF VIBRATION ON THE RHEOLOGICAL CHARACTERISTICS OF MAGNESIA PHOSPHATE AND ORDINARY PORTLAND-CEMENT SLURRIES

The effects of vibration on the rheological characteristics of rapid s trengthening magnesia phosphate based slurries and an ordinary Portlan d cement based reference slurry determined with a rotating viscometer incorporating an interrupted helical impeller are reported. The test p rocedure adopted comprised measuring the effect of vibration on the st ress response to three repetitive shear strain rate cycles undertaken over a 15 minutes period immediately after slurry preparation. The res ults are assessed in the context of the use of the slurry to infiltrat e a steel fibre reinforcing array. The data presented indicates that v ibration does not change significantly the rheological characteristics of either type of cement. Possible explanations of these apparently a nomalous observations are discussed.