Microwave study of hydration of slag cement blends in early period

Journal Article · Sat Jul 01 00:00:00 EDT 1995 · Cement and Concrete Research

DOI:https://doi.org/10.1016/0008-8846(95)00103-J· OSTI ID:99593

Zhang, X; Ding, X Z; Lim, T H; Ong, C K; Tan, B T.G. ^[1]; Yang, J ^[2]

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1. National Univ. of Singapore (Singapore). Dept. of Physics
2. Ssang Yong Cement (Singapore) Limited (Singapore)

Microwave techniques were used to investigate the early hydration of slag cement with different slag percentages, different activators and different amount of activator. It is found that higher slag cement causes a higher dielectric constant {var_epsilon} and a shorter induction period. But higher slag cement samples have very different electrical conductivity {sigma} compared with that of pure cement, their {sigma} curves have two extra bumps in 9--14 h and 22--24 h. The authors found that the addition of 2% NaOH and Na{sub 2}SO{sub 4} results in large changes in {var_epsilon} whereas the addition of 2% Ca(OH){sub 2} causes a little change in {var_epsilon}. Addition of 2% Ca(OH){sub 2} decreases the {sigma} but addition of 2% NaOH and Na{sub 2}SO{sub 4} increases the {sigma}. They also found that the greater the amount of Na{sub 2}SO{sub 4} the smaller the {var_epsilon} but the greater the {sigma}. The relation between the compressive strength results and the {var_epsilon} and {sigma} results are also discussed.

• OSTI ID: 99593
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 5 Vol. 25; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
BLAST FURNACES
CALCIUM HYDROXIDES
CALORIMETRY
CEMENTS
COMPRESSION STRENGTH
CONCENTRATION RATIO
ELECTRIC CONDUCTIVITY
ELECTRON MICROSCOPY
HYDRATION
SLAGS
SODIUM HYDROXIDES
SODIUM SULFATES
THERMAL ANALYSIS
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION