I would like to know the compactive effort (size of the rammer, height of dropping and number of blow) to use to remould disturbed soil sample into its natural state in other to carry out remediation of contaminated soil in the laboratory.
You should avoid dynamic compaction since you can not ensure getting the same unit weight and void ratio of the natural undisturbed soil. Instead use static compaction.To do so calculate the weight of soil that is required to occupy a given volume in the mould,and achieve the same unit weight of the natural soil. Place the soil and press it by static weight to reach the height required. Couple of trials may be needed to know the the required applied pressure. Natural particle bonds will not likely be destroyed by static pressure.
Depending upon resources that you are able to access you could simply use a bulk density hammer with a piece of wood cut to the size of the mold (a bucket or smaller tray) the soil will sit. Basically do a days worth of experimentation, slowly compact the soil with a many drops of the hammer over time. The take a BD sample to see if you have what you want, or measure the compaction with a soil penetrometer afterwards. Match the compaction or bulk density to the field conditions of the site you aim to remediation. Have fun experimenting. Attached is a classic paper on physiochemical parameters of forest soils productivity.
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