Geological classification of stones, Civil Engineering

Geological Classification

Based on their beginning of formation stones are classified into 3 main groups-Igneous, sedimentary and metamorphic rocks.

  1. Igneous Rocks: These rocks are formed by solidifying and cooling of the rock masses from their molten magmatic condition of the material of the earth. In general igneous rocks are durable and strong. Granite, trap and basalt are the rocks which are belonging to this category; Granites are formed by slow cooling of the lava under thick cover on the top. Therefore they have crystalline surface. Cooling of lava at the top surface of earth results into non-crystalline and glassy texture. Trap and basalt belongs to this category.
  2. Sedimentary Rocks: Due to the reason of weathering action of water, wind and frost presented rocks disintegrates. Disintegrated material is carried by water and wind; the water being most powerful medium. Water which is flowing deposits its suspended materials at some points of obstacles to its flow. These deposited layers of materials consolidated under pressure and by heat. Chemical agents also give contribution to the cementing of the deposits. The rocks therefore formed are, fine grained, more uniform and compact in their nature. They represent a bedded or stratified structure generally Sand stones, lime stones, mud stones etc. belong to this class of rock.
  3. Metamorphic Rocks: Previously formed igneous and sedimentary rocks undertake changes due to metamorphic action of pressure and internal heat. For instance due to metamorphic action granite becomes trap, greases, and basalt change to schist and laterite, lime stone converts to marble, sand stone becomes quartzite and mud stone becomes slate.
Posted Date: 10/16/2012 1:49:05 AM | Location : United States







Related Discussions:- Geological classification of stones, Assignment Help, Ask Question on Geological classification of stones, Get Answer, Expert's Help, Geological classification of stones Discussions

Write discussion on Geological classification of stones
Your posts are moderated
Related Questions
Example: The following fore bearings were observed respectively for lines, AB, BC, CD, DE, EF and FG. Find out their back bearings: (i) 148°                          (ii

a) Determine the critical Euler buckling load of a solid aluminium rod of 12 mm diameter if it has a length of 1.0 m between pin-ended supports. (E = 70000 N/mm2)       b) A

Extreme fiber stresses at the mid span section of  the beam A pre-stressed concrete beam, of  cross section 300 mm x 500 mm and 8 m span, is pre-stressed with a parabolic tend

Q. Sand layer vs. cement sand used as bedding of precast concrete paving units Cement sand is a mixture of sand and cement and it behaves as a cohesive mass once mixed. Usuall

Using Laplace transfom, the following differential equation d y dy dt reduces to the algebraic equation of the form Resolve y(s) into partial fractions

Q. One-way pre stressing vs two-way pre stressing? At the time of pre-stressing operation at one end, frictional losses will take place and the prestressing force decreases alo

Question What are main functions of slip joints in block work seawalls ? Answer Slip joints are joints that are formed during a complete vertical plane from cope

Q. Minimum and maximum area of reinforcement? Minimum area of reinforcement vs. maximum area of reinforcement Beams can be designed to be larger than required for strength

Question Have to emulsified asphalts or cutback asphalts be selected as staple coat in bituminous road works? Answer Emulsified asphalt is a postponement of asphalt

A 70-ft long, ¾" diameter, 6 x 7 FC wire rope is resisting a tension force of 12-kips.  The elastic stretch of the steel wire rope given the following properties is most nearly: E