Effect of Nonionic Polyacrylamide Flocculant on Dispersibility of Water Reducer
Nonionic polyacrylamide flocculant,polycarboxylic acid superplasticizer and naphthalene series superplasticizer with different side chain length and ratio of acid to ether were selected to study the interaction between polyacrylamide and superplasticizer and the influence on the dispersion of superplasticizer.The results were found:with the increase of polyacrylamide content,the initial dispersion and retention properties of water reducing agent decreased,but naphthalene series water reducing agent was least affected.With the increase of side chain length of polycarboxylic acid,the initial dispersion and retention properties of polycarboxylic acid superplasticizer decreased more seriously.With the increase of acid-ether ratio of polycarboxylic acid,the initial dispersion and retention properties of polycarboxylic acid superplasticizers were not significantly affected by polyacrylamide.Polycarboxylic acid superplasticizer was first adsorbed on cement particles,and then side chain interacted with polyacrylamide through hydrogen bond and entanglement,thus reducing the steric hindrance effect of the superplasticizer.With the hydration of cement,it was easier to be covered by hydration products.
nonionic polyacrylamideflocculantwater reducing agentside chain lengthratio of acid to ether
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