Influences of common temperatures on interactions between superplasticizers and cements containing limestone or granulated blastfurnace slag

The dispersing effect of superplasticizers at standard temperature is well known. This contribution extends the knowledge about interactions between superplasticizers and cements to common hot and cold weather temperatures. With a temperature decreasing from 30°C to 5°C the maximum addable dosage of superplasticizer (saturation dosage) to samples with Portland cement decreased considerably. Temperature fluctuations can so quickly result in an insufficient or excessive superplasticizer addition. The use of clinker-efficient cements with higher proportions of further main constituents enhanced the robustness of the particular cement- superplasticizer-interactions against temperature variations. Additionally, cements with several main constituents compensated for the temperature-dependent action mechanisms of the superplasticizers.

Author: J. Herrmann, J. Rickert

Section: Science and production

Keywords: cements with several main constituents, limestone, granulated blastfurnace slag, superplasticizer, temperature.