21-08-2013, 01:54 PM
SUPERPLASTICIZERS
SUPERPLASTICIZERS[.ppt (Size: 7.49 MB / Downloads: 163)
INTRODUCTION
SUPERPLASTICIZERS ARE ADMIXTURES THAT ALLOW LARGE WATER REDUCTION OR GREATER FLOWABILITY
THAT IS USED AS AN INGREDIENT OF CONCRETE AND IS ADDED TO THE BATCH IMMEDIATELY BEFORE OR DURING MIXING.
SUPERPLASTICIZERS ARE USED TO MODIFY THE PROPERTIES OF ORDINARY CONCRETE SO AS TO MAKE IT MORE SUITABLE FOR ANY SITUATION.
CLASSIFICATION
SULPHONATED MALAINE-FORMALDEHYDE CONDENSATES (SMF)
SULPHONATED NAPHTHALENE-FORMALDEHYDE CONDENSATES (SNF)
MODIFIED LIGNOSULPHONATES (MLS)
POLYCARBOXYLATE ETHER SUPERPLASTICIZER (PCE)
APPLICATION OF INDIA
SUPERPLASTICIZERS IS WIDELY USED ALL OVER THE WORLD.
USE OF RMC HAS REALLY PROMOTED THE USE OF SUPERPLASTICIZERS IN INDIA,IN RECENT TIME
INDIA IS CATCHING UP WITH THE USE OF SUPERPLASTICIZERS IN THE CONSTRUCTION OF HIGH RISE BUILDINGS, LONG SPAN BRIDES
CONCLUSION
DRAMATIC IMPROVEMENTS IN WORKABILITY AND PLACEABILITY OF
FRESH AND HARDENED CONCRETE HAVE BECOME FEASIBLE WITH
SUPERPLASTICIZING ADMIXTURES. SUPERPLASTICIZED CONCRETE IS
STILL CONCRETE WHICH MUST BE PROPERLY PROPORTIONED, MIXED,
PLACED, CURED AND FINISHED OR PROBLEMS WILL ARISE. A
SUPERPLASTICIZER IS NOT A CURE-ALL ADMIXTURE; IT HAS ITS OWN
PROBLEMS, WHICH MUST BE TAKEN INTO ACCOUNT.