1500 1ST ST RAIL BARGE FACILITY 2018-01-01 MF Import

i � 1 MIXING. The dry cement shouid be thoroughly field mixed with the loosened 2 subgrade soils and then compacted. 3 ! 4 �LACING. The mixture shall be transported to the job site in suitable vehicles 5 ard shall be deposited on the moistened subbase in uniform layers by means of I 6 approved mechanical spreaders. Not more than 60 minutes shall elapse r 7 between the start of moist mixing and the start of compaction of the 8 cement-treated mixture an the prepared subgrade. 1 9 10 COMPACTION. Immediately upon completion of the spreading operations, the 11 mixture shall be thoroughly compacted through the use of a vibralory compactor. 12 The number, type, and weight of rollers shali be sufficient to compact the mixture ,� 13 to the rer�uired density. 1 14 15 The field density of the compacted mixture shall be at least 95 percent of the � 16 maximum density of laboratory specimens prepared from samples of the 17 cement-treated base materiai taken from the material in place. The in-place field 18 density shall be determined in accordance with ASTM D 1557. 1 ,9 20 LAYER THICKNESS. The maximum depth of a compacted layer shall be 6 21 inches except where that total depth oF the compacted base course is required to 22 be greater than 6 inches no layer shall be in excess of 8 inches or less than 4 � 23 inches when compacted. In multilayer construction, the surface of the 24 compacted material shall be kept moist until covered with the next layer. � 25 Successive layers shall be placed and compacted so that the required total depth � 26 of the base course is completed the same day. 27 28 FINISHING. Finishing operations shall be completed during daylight hours, and � 29 the completed base course shall conform to the required lines, grades, and cross � 30 section. Ii necessary, the surface shall be lightly scarified to eliminate any 31 imprints made by the compacting or shaping equipment. The surface shall then � 32 be recompacted to the required density. � 33 34 The compaction and finishing operations shall be completed within 2 hours of the � 35 time water is added to the mixture and shall produce a smooth, dense surface � 36 that is free of surface checking, ridges, or loose material. 37 � 38 SURFACE TOLERANCE. The finished surface shall not vary more than 1.0 inch ( 39 when tested with a 16-foot straightedge applied parallel with, or at right angles to, 40 the centerline of the stabilized area. Any deviation in excess of this amount shall � 41 be corrected by the Contractor at the Contractor's expense. 42 43 CONSTRUCTION JOINTS. At the end of each day's construction, a transverse � 44 construction joint shall be formed by a header or by cutting back into the 45 compacted material to form a true vertical face free of loose material. 46 47 Measurement 48 Sectian 4-03.4: 49 Cement lreated base will be measured by the square yard. 50 Port of Evcretl FAWAT-OY039 Sateilite RaIllBarge Transfer Facility Final Port Revlew DraR Phase 7:Pler Construction 46 15 March 2005