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86 Chloride Section PVC box Condition I 20 ft Condition II Condition III 1.5 ft 40 ft 100 ft 2% slope Figure 4.28. General site layout (not to scale). Multimeter Reference electrode Connector box Ground Surface Metallic Pipe Figure 4.29. Half-cell potential reading connection. pipe samples every time data was collected. If the surface was 15 hours after the completion of placement. The average too dry, the surface was wetted to obtain a better electrical con- strength of the CLSM, 24 hours after the placement, was about nection. Figure 4.29 shows the schematic of the half-cell 345 kPa, measured by the penetrometer test. Figure 4.30 shows potential test setup. the compressive strength of the CLSM mixtures sampled from the two trucks at 4, 7, and 28 days. Test Results Table 4.18. Field penetrometer results. Two CLSM samples were taken from each of the two ready- mix concrete trucks that delivered the material to the trenches, Time after Penetrometer Results (kPa) and the flow and air contents were quite uniform, with flows placement 1 2 3 4 5 6 (hours) ranging from 225 to 240 mm and air contents ranging from 14 0 0 0 0 0 0 0 to 19 percent. The field penetrometer could not register any 11 0 0 0 0 0 0 readings for about the first 11 to 12 hours after trench place- 12 14 21 0 21 14 0 15 34 48 34 55 41 48 ment. The field penetrometer data are shown in Table 4.18. 19 269 290 276 255 269 283 The particular CLSM mixture used in this study exhibited a 21 331 338 359 241 345 324 sufficient set to support the weight of an average person about 24 359 345 331 338 345 345