Research on Time-varying Behavior of Cement Grouts of Different Water-cement Ratios

摘要

The thesis presents an research on the time-varying behavior of cement grouts with different water-cement ratio of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.9, 1.0, 1.1, 1.25, 1.0, 2.0, 5.0 and 10.0 at 0 minute, 5minutes, 10minutes, 20minutes, 30minutes, 60minutes, respectively. This was to investigate the time-varying behavior of reheological parameters of cement grouts with different water-cement ratios. It confirmed that: consistency coefficient and viscosity are time-varying reheological parameters, while rheological index and initial stress(yield stress) are time-independent behavior; the flow pattern properties of cement grouts with different water-cement ratios could remain unchanged with time; the laws with time change of consistency coefficient and viscosity of cement grouts accord exponential function, c_p(t)=c_0×e~(kt) (Power-law fluid) or η_p(t)=η_0×e~(kt)(Newtonian fluid or Bingham fluid). These research results have very important realistic value and theory meaning.