MT SOURCE Flashcards
Uncemented aggregate of mineral grains and decayed organic matter (solid particles) along with the liquid and gas that occupy the empty spaces between the solid particles
Soil
Introduced the fundamental principles of soil mechanics on which more advanced studies are based.
Karl Terzaghi
The science and practice of the part of civil engineering that involves natural materials found close to the surface of the earth.
Geotechnical Engineering
He was credited as the first person to use mechanics to solve soil problems.
Coulomb
He paid great attention to soil types (sand, gravel, etc.) and to design and construction of solid foundations.
Vitruvius
They were formed by movement of soils from its original place by gravity
Colluvial Soils
formed by deposition in the seas
Marine Soils
are formed from sediments, animals and plant materials that are deposited in water or on land on the earth’s surface and then subjected to pressures and heat.
Sedimentary Rocks
are formed from magma (molten rock materials) emitted from volcanoes that have cooled and solidified.
Igneous Rocks
are ground fractures.
Faults
is the ratio of the weight of water to the weight of solids.
Water Content
is the ratio of the volume of void to the total volume of soil.
Porosity
is the weight density, that is, the weight of a soil per unit volume.
Bulk Unit Weight
is the weight of a dry soil per unit volume.
Dry Unit Weight
is an index that quantifies the degree of packing between the loosest and densest state of coarse-grained soil.
Relative Density
It is the ratio of soil particles whose diameter for which 60% of the particles are finer over the diameter of the soil particles for which 10% of the particles are finer
D60
It is the ratio of soil particles which the square of the 30% of the soil particles are finer over the product of the soil particles for which 10% and 60% of the particles are finer
D30
The average grain size of this soil particles ranges from 4.75mm to 75mm
Gravel
The average grain size of this soil particles ranges from 0.075mm to 4.75mm
Sand
The moisture content required to close a distance of ½ inch along the bottom of the groove at exactly 25 blows using the liquid limit device.
Liquid Limit
moisture content at which the soil, when rolled to 1/8 inch (32.2mm) in diameter crumbles
Plastic Limit
Soil mass shrinks as moisture is gradually, decreased or lost with continuous loss of moisture, a stage of equilibrium is reached at which more loss of moisture will result to no further volume change.
Shrinkage Limit
is the ratio of the difference in water content between the natural or in situ water content of a soil and its plastic limit to its plasticity index.
Liquidity Index
developed one scheme that classifies soils according to their usefulness in roads and highways
AASHTO (American Association of State Highway and Transportation Officials)
was originally developed for use in airfield construction but was later modified for general use.
USCS (Unified Soil Classification System)
It delineates the boundaries between clays (above the line) and silts and organic soils (below the line)
A-LINE
It is appended in parentheses to the main group to provide a measure of quality of soil as highway subgrade material.
Group Index
The value of your answer in 29 if it fall on A-1 and A-3
Zero
The average grain size of this soil particles is less than 0.002mm
Clay
A Swedish scientist who developed a method to describe the consistency of fine grained soils
Attenberg
