Grouting PPT

Grouting • Defined as the injection of a special liquid or slurry material called grout into the ground for the purpose of improving the soil or rock  • Types of grouts  –  Cementitious grouts  –  Chemical grouts(fine sand and silts)

!"#CT$%#& ' GT$*G • $t is used in foundation +orks ,efore construction to increase ,earing capacity • To get the ground surface more stronger  • Grouting fills the empty spaces present  ,elo+ the ground surface • $t produces less permea,le soil • &eepage pressure is eliminated

-$*C$-.# ' GT$*G • The principle involved in grouting is to introduce grout materials in to the soil either ,y pumping of injecting of fluidi/ed materials using small diameter tu,e

T0-#& ' GT$*G • Grouting methods may ,e classified in to 1 categories • 23$ntrusion grouting • 43Compaction grouting • 53-ermeation grouting • 63"et grouting • 13#lectro grouting

Grouting methods $ntrusion grouting  –  Consists of filling joints or fractures +ith grout  –  -rimary ,enefit is reduction in permea,ility of rock   –  sed to prepare foundation and a,utments for dams  –  sually done using cementitious grouts

-ermeation grouting  –  $njection of thin grouts into the soil  –  nce the soil cures7 ,ecomes a solid mass of impermea,le  –  Done using chemical grouts  –  sed to sta,ilise the soil ,efore e8cavation

Grouting methods • Compaction grouting  –  Thin grout injected at high  pressure3$t is applica,le for cohesionless soils3The main effect of grout is to compact the soil  –  sed to repair structures that have e8cessive settlement

Grouting methods "et grouting  –  Developed in "apan  –  ses a special pipe +ith hori/ontal jets that inject grout into the ground at high pressures  –  "et grouting is an erosion9replacement system that creates an engineered7 in situ soil9cement product kno+n as &oilcretesm3 #ffective across the +idest range of soil types7 and capa,le of ,eing performed around su,surface o,structions and in confined spaces7 jet grouting is a versatile and valua,le tool for soft soil sta,ili/ation7 underpinning7 e8cavation support and ground+ater control3

GT$*G :#T;D& • #lectro grouting< • $n electro grouting method electro osmosis process takes place ,y the addition of chemicals such as calcium chloride or sodium silicate3 • =hen electric current is applied the chemicals starts flo+ing in the opposite direction i3e at cathode • ;ere anode acts as grout injection pipe