FLATGEO Consulting Co., Ltd.

List of Standards

List of Standards

The list of standards (ASTM, BS and TCVN) which are commonly used in...

Holiday calendar in 2019

Holiday calendar in 2019

Date Number of days off 2019  New Year's...

Standard Penetration Test

Standard Penetration Test

Standard penetration test (SPT) is one of the most common in situ testing...

Precision or Accuracy ???

Precision or Accuracy ???

When working with technical documents, readers are often deal with specific...

Bulk Density

Bulk Density

1. Definition: A bulk density of a soil sample is defined as a mass per...

Compaction Test

Compaction Test

1. Definition: The bulk density or dry density of soils is not a constant...

Warning on Webpage Content Stealing

Warning on Webpage Content Stealing

On February 27, 2014, flatGEO Consulting Co. accessed to a webpage on...

Datalogger for Oedometers

Datalogger for Oedometers

After a four-month-trial period, flatGEO has finished a datalogger system for...

  • List of Standards

    List of Standards

    July 18, 2011
  • Holiday calendar in 2019

    Holiday calendar in 2019

    October 2, 2011
  • Standard Penetration Test

    Standard Penetration Test

    December 12, 2011
  • Precision or Accuracy ???

    Precision or Accuracy ???

    January 7, 2012
  • Bulk Density

    Bulk Density

    February 20, 2012
  • Compaction Test

    Compaction Test

    March 7, 2012
  • Warning on Webpage Content Stealing

    Warning on Webpage Content Stealing

    February 27, 2014
  • Datalogger for Oedometers

    Datalogger for Oedometers

    July 21, 2015
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Slide01rollingThe plastic limit (PL) is the water content where soil transitions between brittle and plastic behaviour. To determine this behaviour boundary, soil balls are rolled into threads of 3 mm diameter and if those 3 mm threads begin to crumble then their water content are plastic limit of soils.

Soil plastic limit could be called as “rolling limit” because technicians have to “roll soil balls into threads” to determine this type of limit.

Slide01 "Degree of saturation" of a soil sample is not an index test but derived from its natural moisture content, void ratio and specific gravity. Degree of saturation is denoted by Sr which has the unit of percent describes the degree of water filling in voids of a soil mass.

In practical, degree of saturation varies in the range of 0% ~ 100% and never reaches the margin of 0% or 100%. However, some of geotechnical laboratories in Vietnam suppose that the value of saturation degree is higher than 100% for organic soils (!)

Bulk density 1. Definition:

Soil moisture content (or water content) is the amount of water which can be removed when a soil sample is dried at the temperature of 105°C. Moisture content is usually expressed as a percentage of the dry mass.

Thí nghiệm đầm nên1. Definition:

The bulk density or dry density of soils is not a constant value, it could be changed in relation with the moisture content of soils and the compaction effort.

Bulk density 1. Definition:

A bulk density of a soil sample is defined as a mass per unit volume. The bulk density is denoted by ρm and has a unit of g/cm³ or Mg/m³.