Title:
Influence of Temperature on Stabilizing Agents in Presence of Superplasticizers
Author(s):
Wolfram Schmidt, Henricus J. H. Brouwers, Hans Carsten Kuehne, and Birgit Meng
Publication:
Symposium Paper
Volume:
288
Issue:
Appears on pages(s):
1-15
Keywords:
biopolymer, polycarboxylate ether, rheology, setting, stabilizing agent, starch
DOI:
10.14359/51684241
Date:
9/14/2012
Abstract:
Depending upon the chemical source and the polymeric structure, stabilizing agents affect cementitious systems differently with effect on rheology and early age prop¬erties. They can also modify the effects produced by superplasticizers. Additionally, envi¬ronmental temperatures can change their effectiveness significantly, yielding adverse work¬ability properties or modified early hydration. This study presents the effects of different stabilizing agents on cementitious binder pastes exposed to varied climatic conditions during casting and early hydration. Rheological measurements show in which ways envi¬ronmental conditions affect the flow properties and the resistance to segregation. Further¬more it is demonstrated that due to interactions, the typically observed retarding effect of stabilizing agents on the setting of cementitious systems does not necessarily occur when superplasticizers based on polycarboxylate ether are present.