hight range water reducer.
Posted by Fafa from Tunis, OT, TN on March 7, 2007
How can we decide if a chemical ptoduct can be used as a hight range water reducer?
As the Sodium Tripolyphosphate is used to modify or to enhance the reological proprities of the clay; can we use it for cement pastes? And how can we study its effects on the concrete behavior ( at early age and hardening time)?
Any chemical admixture to qualify as a high range water reducer (HRWR) has to meet the requirements stated in ASTM C 494. The most widely used HRWR’s are based on Sulphonated naphthalene formaldehyde (SNF), Sulphonated melamine formaldehyde (SMF), Polycarboxylate admixtures (PC) and Modified Lignosulphonates.
The common fresh and hardened properties studied on concrete using admixtures are, slump (workability), slump retention, compressive strength, set time, air entrainment, freeze thaw, shrinkage etc.
I do not have any information on the use of Sodium Tripolyphosphate on cements.
