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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.
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
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
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 1. Sedimentation basin or clarifier is used to remove particles that will settle in a reasonable time period 2. Basins are usually rectangular or
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? 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 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 In 1980, the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) was enacted to address tho
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