期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 131, 期 1, 页码 37-47出版社
SPRINGER
DOI: 10.1007/s10973-017-6271-y
关键词
Cement chemical additives; Alkanolamine; Hydration; Thermal analysis
资金
- National Natural Science Foundation of China [51202109]
- National High Technology Research and Development Program (863'' Program) of China [2015AA034701]
- Key technology research for coordination steel slag cement industry [2013-M1-6]
- State Key Laboratory of Material Oriented Chemical Engineering [KL14-01]
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Four types of alkanolamines (i.e., traditional alkanolamines represented by TEA and TIPA and new alkanolamines represented by DEIPA and EDIPA) were added to Portland cement as chemical additives, and their effects on the cement properties and hydration process were investigated. An isothermal calorimeter was used to track the hydration heat flow of the cement pastes with or without alkanolamines. Thermogravimetric analyses were performed to measure the degree of hydration over the course of 28 days. In addition, X-ray diffraction, MIP analysis and SEM were used as auxiliary tests. The results indicated that alkanolamines improved the compressive strength of the cement mortars. It was found that TEA increased the rate of the second hydration of C(3)A, and TIPA accelerated the hydration of C(4)AF. DEIPA and EDIPA promoted the hydration of both the aluminum and ferrite phases as well as catalyzed the conversion of AFt to the AFm phase. By contrast, the new alkanolamines represented by DEIPA and EDIPA expressed more superior properties.
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