PHASE II REPORT - Caltrans

Figure 4.10: Mix M4 Trace with Standard Propeller and Small Stainless Steel Bowl at 50
rpm
B) Effect of Mixing Procedure:
The first mixing procedure attempted was combining the dry aggregate, cement, additives, and
water in the mixing bowl. The emulsion was added last. At this point, the AMT was started.
This procedure caused a significant increase in “noise” in the AMT traces and almost no
increase in torque. This noise was a result of the materials initial resistance to mix. The trace
for this mixing procedure is shown in Figure 4.11.
The second mixing procedure consisted in “pre-mixing” the ingredients in the bowl; emulsion
last. The results indicated less initial mixing resistance and an increase in torque with time.
Figure 4.12 shows the trace of the pre-mixed materials. Based on these observations, the
mixing procedure steps were determined.
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