التفاصيل البيبلوغرافية
| العنوان: |
Current understanding of comb-like copolymer dispersants impact on the hydration characteristics of CA-gypsum suspension. |
| المؤلفون: |
Yu, Yinhui, Liu, Jiaping, Ran, Qianping, Qiao, Min, Zhou, Dongliang |
| المصدر: |
Journal of Thermal Analysis & Calorimetry; Jan2013, Vol. 111 Issue 1, p437-444, 8p |
| مصطلحات موضوعية: |
COPOLYMERS, DISPERSING agents, HYDRATION, GYPSUM, SUSPENSIONS (Chemistry), DISSOLUTION (Chemistry), CALCIUM aluminate |
| مستخلص: |
Two characteristic comb-like copolymer dispersants (PCs) with either ester (-COO-) or ether (-C-O-C-) linkages were employed to evaluate their impact on the hydration behavior of CA-gypsum suspension. It is determined that the addition of copolymers accelerates the depletion of sulfate as well as the CA dissolution at the CA/gypsum molar ratio of 0.3. Besides, we highlighted a gradual slowing down of CAH precipitation but an increasing formation of monosulfoaluminate phase (AFm). Moreover, a great impact of PCs chemistry and PCs adsorption behavior is noticed. It is demonstrated that PC2 with ester linkage has a stronger adsorption onto CA-gypsum suspension, hence induces a stronger retardation of CAH precipitation. It is assumed that the competitive adsorption between PCs and sulfate eventually leads to the dissolution sites of CA are partly occupied by PCs. With a higher amount of extra sulfate released in the pore solution, it turns out that an increasing AFm precipitation and sulfate consumption appears. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
