What do you mean by piston sampler, Civil Engineering

Assignment Help:

Q. What do you mean by Piston sampler?

In sampling silts orclays, Piston sampler is lowered into boreholes and piston is locked at bottom of the sampler. This stops debris from entering the tube prior to sampling. After reaching the sampling depth, piston is unlocked so that piston stays on top of the sample going into the tube. Prior to withdrawal of the sampler, piston is locked to prevent the downward movement and vacuum generated during movement of the piston from sampler's end aids in retaining the samples recovered. Sample recovery is increased by using Piston samplers.


Related Discussions:- What do you mean by piston sampler

Determine the coefficient of compressibility, A saturated clay layer 4 m th...

A saturated clay layer 4 m thick is located 6 m below GL. The void ratio of the clay is 1.0. When a raft foundation is located at 2 m below GL, the stresses at the top and bottom o

What is immediate settlement, Q. What is Immediate Settlement? Strain i...

Q. What is Immediate Settlement? Strain in all coarse grained, dry or partly saturated fine grained soils occur immediately after the application of stress. Hence, this change

Concrete, Determine the quantity of materials required per batch and probab...

Determine the quantity of materials required per batch and probable output from a concrete mixing plant of 1200lts capacity. The design per 1000lts of mixed concrete is as follows

Explain sedimentation, Explain Sedimentation 1. Sedimentation bas...

Explain Sedimentation 1. Sedimentation basin or clarifier is used to remove particles that will settle in a reasonable time period 2. Basins are usually rectangular or

Total volume of soil that excavated from the borrow area, Project specifica...

Project specifications require a relative compaction of 95% (modified Proctor).  Construction of a highway embankment requires 10,000-yd 3 of fill.  The borrow soil has an in-situ

Define sounding or sensing devices, Define Sounding or Sensing Devices? ...

Define Sounding or Sensing Devices? Sounding devices are effective in checking scour in the streambed adjacent to a bridge. Although sounding/sensing devices can be used indepe

Minimum volume of sump volume for pumps, Minimum volume of sump volume for ...

Minimum volume of sump volume for pumps Maximum pumping rate = Q P Volume of sump = V Inflow Rate = Q i Cycle Time T c = t 1 + t 2 t 1 = V / Q P - Q i t 2

Explain cercla and sara - hazardous waste regulations, Explain CERCLA and S...

Explain CERCLA and SARA - Hazardous Waste Regulations In 1980, the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) was enacted to address tho

Revit , how to use the revit program

how to use the revit program

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd