Effect of Temperature on Rheological Properties of Superplasticized Cement Mortars

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Effect of Temperature on Rheological Properties of Superplasticized Cement Mortars

Author(s): J. Golaszewski

Publication: Special Publication

Volume: 239

Issue:

Appears on pages(s): 423-440

Keywords: fresh concrete; mortars; rheology; superplasticizer; temperature; workability

Date: 10/1/2006

Abstract:
The methodology and the results of the investigation into influence of the temperature on the rheological properties of fresh mortars containing different superplasticizers and cements are presented, and discussed in this paper. Influence of temperature was studied using Two Point Workability Test (TPWT) and modified standard mortars acc. PN EN 196-1 which can be also considered as a model of concrete. The following factors were taken into consideration: mix temperature (10, 20, 30oC), specific surface of cement (320, 370, 420 m2/kg), C3A content in cement (2, 7, 12%), Na2Oe content in cement (0.3, 0.7, 1.1%), and superplasticizer type (polyeter and polycarboxylate acid based superplasticizers with different molecular weight and polymer structure). The obtained results show that temperature strongly influences rheology of mortars and that the nature and range of this influence changes in wide range depending on the properties of cement and superplasticizer used. Basic effects of temperature influence on rheological parameters of mortars in relation to mentioned above factors are presented and discussed. These relationships can be applied to control workability of fresh mortar and concrete. Discussion about the results covers also mechanism of temperature influence on rheological properties of mortars. It is concluded that compatibility of cement - SP system must be tested taking into account temperature. TPWT made on mortars makes possible to select a cement - superplasticizer system that is optimal in given temperature, and to collect data necessary for control of fresh mortar and concrete workability in various temperature conditions.