期刊
CEMENT AND CONCRETE RESEARCH
卷 67, 期 -, 页码 122-130出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2014.09.002
关键词
DEIPA; Hydration kinetics (A); Microstructure (B); Portland cement (D)
资金
- National Natural Science Foundation of China [51202109]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1146]
- National Building Materials Industry Technology Innovation Programme [2013-M1-1]
- Modern Analysis and Testing Centre at Nanjing Tech University
Diethanol-isopropanolamine (DEIPA) is a tertiary alkanolamine used in the formulation of cement grinding-aid additives and concrete early-strength agents. In this research, isothermal calorimetry was used to study the hydration kinetics of Portland cement with DEIPA. A combination of X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC)-thermogravimetric (TG) analysis and micro-Raman spectroscopy was used to investigate the phase development in the process of hydration. Mercury intrusion porosimetry was used to study the pore size distribution and porosity. The results indicate that DEIPA promotes the formation of ettringite (AFt) and enhances the second hydration rate of the aluminate and ferrite phases, the transformation of AFt into monosulfoaluminate (AFm) and the formation of microcrystalline portlandite (CH) at early stages. At later stages, DEIPA accelerates the hydration of alite and reduces the pore size and porosity. (C) 2014 Elsevier Ltd. All rights reserved.
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