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Effect of Sodium Glucoheptonate and Sodium Glucona…
Author:YU Xin1 2  YU Cheng1 2  RAN Qianping1 2  LIU Jiaping3 
Unit:(1. State Key Laboratory of High Performance Civil Engineering Materials  Jiangsu Research Institute of Building  Science  Nanjing 210008  China  2. Jiangsu Sobute New Materials Co. Ltd.  Nanjing 211103  China   3. College of Materials Science and Engineering  Southeast University  Nanjing 211189  China) 
Keyword:sodium glucoheptonate  sodium gluconate  cement hydration  
Classification:TU528.042.3
Year,volume(Issue):page number:2019,47(5):0-0
Summary:

 The effect of sodium glucoheptonate on the setting time, fluidity and strength of cement was investigated. The retarding mechanism was analyzed by using microcalorimeter, conductivity meter and X-ray diffractometer, and the adsorption and complexation abilities of two reagents (i.e., sodium glucoheptonate and sodium gluconate) were also compared. The results show that sodium glucoheptonate has a better retarding effect and a higher initial fluidity of cement mortar at the same molar dosage, compared to sodium gluconate. Sodium glucoheptonate has a greater impact on the early strength development, but does not affect the long-term strength. The cement hydration process is delayed mainly by blocking the crystallization of hydration products. The adsorption and complexation ability of sodium glucoheptonate is stronger than that of sodium gluconate, thus delaying the hydration process of cement more.

 
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