Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

2nd International Conference on Innovative Materials, Structures and Technologies

Šeputyte-Juciké, J.^1 ; Pundiene, I.^1 ; Kiaite, A.^2 ; Pranckeviiene, J.^1

Vilnius Gediminas Technical University, Scientific Institute of Thermal Insulation, Linkmenu Str. 28, Vilnius

LT-08217, Lithuania^1

Vilnius Gediminas Technical University, Sauletekio Str. 11, Vilnius

LT-10223, Lithuania^2

关键词: Cement paste;    Cement sample;    Effect of plasticizers;    Heat Release Rate (HRR);    Hydration properties;    Maximum heat release rate;    Solubility characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/96/1/012019/pdf
DOI  :  10.1088/1757-899X/96/1/012019

来源: IOP

【 摘 要 】

The article analyzes the effect of plasticizer (based on polycarboxilates) amount (0.3 - 1.2% wt. of cement) on the rheological and hydration properties of two Portland cements pastes: CEM II/A-S 42.5N and CEM II/A-LL 42.5N. Increase of plasticizer amount reduces viscosity of CEM II/A-LL 42.5N cement paste from 3 to 12 times, where viscosity of CEM II/A-S 42.5N cement paste reduces from 5 to 20 times. The optimum plasticizer dose (0.3%) in case of CEM II/A-S 42.5N and (1.2%) in case of CEM II/A-LL 42.5N was established. Calorimetry studies have shown that plasticizer reduces the wetting heat release rate in CEM II/A-LL 42.5N cement twice and in CEM II/A-S 42.5N cement - by 25%. Plasticizer prolongs the maximum heat release rate time by 16 h in CEM II/A-LL 42.5N samples and reduces heat release rate by 19%. In CEM II/A-S 42.5N cement samples plasticizer prolongs maximum heat release rate time by 14.5 h and increases heat release rate by 15%. The goal of this study is to analyze the effect of the dosage of the most widely used plasticizer on solubility characteristics, rheological and hydration properties of two cements CEM II/A-S 42.5N and CEM II/A-LL 42.5N to establish the optimum dose of plasticizer in cements pastes.