47. Pumpable ConcretePumpable Concrete
However if the concreteHowever if the concrete
is too saturated at higheris too saturated at higher
W/C ratio the concrete atW/C ratio the concrete at
certain pumpcertain pump pressurespressures
maymay bebe suchsuch thatthat waterwater isis
forcedforced outout ofof thethe mix,mix,
creatingcreating anan increaseincrease inin flowflow
resistanceresistance andand aa possiblepossible
blockage.blockage.
51. Placing ConcretePlacing Concrete
Placement with Conveyor BeltPlacement with Conveyor Belt
Concrete spread evenly
across the subgrade by the
paver before consolidation
and finishing
70. Curing of Concrete: Water curingCuring of Concrete: Water curing
• ThisThis isis
methodmethod
satisfiesatisfie
ss
by farby far thethe bestbest
ofof curingcuring asas itit
allall thethe
ofofrequirementsrequirements curingcuring
,,namely,namely,
hydration,hydration,
promotionpromotion ofof
eliminationelimination ofof
• shrinkage and absorptionshrinkage and absorption
ofof the heat of hydration.the heat of hydration.
• (a)(a) ImmersionImmersion
• (b)(b) PondingPonding
(c)Spraying(c)Spraying oror
FoggingFogging
(d)(d) Wet coveringWet covering
85. Factors Affecting WorkabilityFactors Affecting Workability
• Water ContentWater Content
• Mix ProportionsMix Proportions
• Size of AggregatesSize of Aggregates
• Shape of AggregatesShape of Aggregates
• Surface Texture of AggregateSurface Texture of Aggregate
• Grading of AggregateGrading of Aggregate
• Use of Admixtures.Use of Admixtures.