HRWR vs. PC based HRWR
Posted on June 9, 2006
What is the main difference between traditional High Range Water Reducers (HRWR) and polycarboxylate (PC) based HRWR.
Traditionally HRWR were either based on Naphthalene or Melamine. Today most of the new products are based on polycarboxylate polymers. These new products are still formulated to meet ASTM C-494 Type F or G. The biggest difference is the versatility in these new products. Since the polymers are synthesized, they can be specially designed for specific applications. No additional admixtures would be needed for higher earlier strength or longer slump retention. These PC-based products are also much more efficient in water reduction than traditional HRWR. Dosages for regular concrete applications are therefore lower and at higher dosages
