8kg hammer ASTM standard Dynamic Cone Penetrometer

 8kg hammer ASTM standard Dynamic Cone Penetrometer

1,APPLICATION: 8-kg [17.6-lb] DCP dynamic cone penetrometer with an 8kg [17.6-lb] hammer —a device used to assess the in situ strength of undisturbed soil or compacted materials,or both.

2. Summary of Test Method
2.1 The operator drives the DCP tip into soil by lifting thesliding hammer to the handle then releasing it. The totalpenetration for a given number of blows is measured andrecorded in mm/blow, which is then used to describe stiffness,estimate an in situ CBR strength from an appropriate correla-tion chart, or other material charcharacteristics.

3. Signif i cance and Use
3.1 This test method is used to assess in situ strength ofundisturbed soil and compacted materials (or both). Thepenetration rate of the 8-kg [17.6-lb] DCP can be used toestimate in-situ CBR (California Bearing Ratio), to identifystrata thickness, shear strength of strata, and other materialcharacteristics.
3.1.1 Other test methods exist for DCPs with differenthammer weights and cone tip sizes, which have correlationsthat are unique to the instrument.
3.2 The 8-kg [17.6-lb] DCP is held vertically and thereforeis typically used in horizontal construction applications, suchas pavements and f l oor slabs.
3.3 This instrument is typically used to assess materialproperties down to a depth of 1000 mm [39 in.] below thesurface. The penetration depth can be increased using drive rodextensions. However, if drive rod extensions are used, careshould be taken when using correlations to estimate otherparameters since these correlations are only appropriate forspecif i c DCPconf i gurations. The mass and inertia of the devicewill change and skin friction along drive rod extensions willoccur.
3.4 The 8-kg [17.6-lb] DCP can be used to estimate thestrength characteristics of f i ne- and coarse-grained soils, granu-lar construction materials and weak stabilized or modif i edmaterials. The 8-kg [17.6-lb] DCP cannot be used in highlystabilized or cemented materials or for granular materialscontaining a large percentage of aggregates greater than 50 mm[2 in.].
3.5 The 8-kg [17.6-lb] DCP can be used to estimate thestrength of in situ materials underlying a bound or highlystabilized layer by f i rst drilling or coring an access hole.N OTE 1—The DCPmay be used to assess the density of a fairly uniformmaterial by relating density to penetration rate on the same material. Inthis way undercompacted or “soft spots” can be identif i ed, even thoughthe DCP does not measure density directly. 2
3.5.1 A f i eld DCP measurement results in a f i eld or in situCBR and will not normally correlate with the laboratory orsoaked CBR of the same material. The test is thus intended toevaluate the in situ strength of a material under existing f i eldconditions.

3. Apparatus
3.1 The 8-kg [17.6-lb] DCP is shown schematically in Fig.1. It consists of the following components: a 16-mm [ 5 ⁄ 8 -in.]diameter steel drive rod with a replaceable point or disposablecone tip, an 8-kg [17.6-lb] hammer which is dropped a f i xedheight of 575 mm [22.6 in.], a coupler assembly, and a handle.The tip has an included angle of 60 degrees and a diameter atthe base of 20 mm [0.79 in.]. (See Fig. 2.)
3.1.1 The apparatus is typically constructed of stainlesssteel, with the exception of the replacement point tip, whichmay be constructed from hardened tool steel or a similarmaterial resistant to wear.5.2 The following tolerances are recommended:
3.2.1 Hammer weight-measurement of 8.0 kg [17.6 lb];tolerance is 0.01 kg [0.02 lb],
3.2.3 Drop of hammer-measurement of 575 mm [22.6 in.];tolerance is 1.0 mm [0.04 in.],
3.2.4 Tip angle measurement of 60 degrees included angle;tolerance is 1 degree, and
3.2.5 Tip base diameter measurement of 20 mm [0.79 in.];tolerance is 0.25 mm [0.01 in.]

1. Installation and training:
a. If buyers visit our factory and check the machine, we will teach you how to installand use the machine, and also train your workers/technician face to face.
b.Without visiting, we will send you user manual and video to teach you to install and operate.
c.If buyer needs our technician to go to your local factory, please arrange board and lodging and other necessary things.
d.We will give your professional guidance (Product introduction and operation manual) together with product .

2. After Service:
a.One year guarantee for whole machine.
b.24 hours technical support by email 
c.If there is any problem found of the machine, we will repair it for free in one year.
d.Honesty to working for you, after or before sale with our patient and sincerit

 Our company can also produce the customized testing machines as clients' requirements.
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