ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 62, (3) 233 - 239 (2018)


PROPERTIES AND THE HYDRATION OF PORTLAND LIMESTONE CEMENT WITH DIETHANOL-ISOPROPANOLAMINE
 
Lu Xiaolei 1,2, Wang Shuxian 1, Li Chuanhai 2 , 1, Ye Zhengmao 2 , 1, Cheng Xin 2 , 1
 
1 School of Materials Science and Engineering, University of Jinan, Jinan, Shandong 250022, China
2 Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Jinan, Shandong 250022, China

Keywords: Diethanol-isopropanolamine, Portland limestone cement, Properties, Hydration mechanism
 

Diethanol-isopropanolamine (DEIPA) is a new type of alkanolamine used as grinding aids for Portland cement. In this study, the effect of DEIPA on properties of Portland limestone cement (PLC) were investigated by measuring strength of mortar, setting time, compatibility of cement and superplasticizers. A combination of isothermal calorimetry, scanning electron microscopy and mercury intrusion porosimetry was used to investigate the hydration kinetics. The results indicate that the addition of DEIPA markedly enhances the early and late strength of mortar, which gains a 4.4 MPa increment (28.7 %) at 3 d and a 6.3 MPa increment (20.3 %) at 28 d, respectively, and is not significant differences in the setting time. However, the compatibility of cement and superplasticizer becomes poor in the cement paste containing DEIPA. The working mechanism of DEIPA accelerates the hydration of aluminate and alite, and promotes the formation of AFt and monocarboaluminate, as well as the transformation of AFt to AFm. Besides, the addition of DEIPA results in uniformly overlaps hydration products and improves microstructure in hardened cement pastes.


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doi: 10.13168/cs.2018.0016
 
 
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