X8•Standard Penetration Test (SPT) -ASTM 01586-99 standardized sampling techniqueoSize of sampler is standardized. sample at bottom of borehole. "Split spoon"sampler may opened for sample removal. Sampler is robust but provides highlydisturbed sample (Ar=110%). Samples suitable for Atterberg Limits, grain size andvisual classification only.Total weight 67 N(ISIb)Rat, (or wrenchCenter section, split lengthwiseWater porlsThread rorwash pipe1--------813mm(2ft8in.)--------fGow-type split-spoon sampler used in standard penetration test.(Figures from Bowles, 1996)ff---+-X(c)Donut or center-holehammer.Auvilor drivebeadauloII(III(I~:aI IQII(Q)Early style "pinweight'"hammer.oSampler is driven insteadof pushed. Use 140 Ib(63.5 kg) hammer with a30" drop and drivesampler 18". Hammerstyles vary. Safetyhammer most common.Automatic hammers(usually chain driven) arebecoming more common.
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