水泥質材料中混合化學掺料不相容原因的探討

胡翔皓

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水泥質材料中混合化學掺料不相容原因的探討

胡翔皓 , Masters　　Advisor：許貫中　　

繁體中文

工作性；強塑劑；鹽析； workability ； superplasticizer ； salting-out

Abstract │ Reference (33) │ Altmetrics

Abstract 〈TOP〉

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Mixing the Naphthalene sulfonate-based superplasticizer and the carboxylic-based superplasticizer in concrete let the workability be obvious worse. How to resolve this phenomenon is an important topic to this research. In this research, the first to use three kinds of different combinative dosage of the mixed superplasticizer, respectively 1:3,1:1,3:1. The Naphthalene sulfonate-based superplasticizer compared to the carboxylic-based superplasticizer is 3:1,and then there are the worst cement paste’s fluidity.
    In the worst-flow condition(3:1), the research results show that changing the pH value of water of increase in the flow of cement paste and there is no apparent help. In the same conditions(3:1), the mixing superplasticizer in the water which have the visional precipitation when  add NaCl and CaCl2 in the water. But while the same salt concentration add in the pure Naphthalene sulfonate-based superplasticizer and the carboxylic-based superplasticizer, there are no precipitation in both water solution. The experimental results show that mixed superplasticizer solution will be salting-out when there is more salt concentration in the solution. But adding 10mL acetone in the solution, the turbidity of solution will become decreasing which the turbidity result form the precipitation.
     To decreasing the salting-out result form the cement’s salt dissolving in the solution that can decrease cement workability.We replace 5mL water to 5mL acetone and the flow of cement paste is more increasing.This meaning that the workability of mixed superplasticizer is worse because of salting-out.

Reference ( 33 ) 〈TOP〉

4. M. Collepardi, “Admixtures used to enhance placing characteristics of concrete,” Cem. Concr. Comp., 20 (1998) 103.
連結：
5. M. Pei, D. Wang, X. Hu, and D. Xu, “Synthesis of sodium sulfanilate phenol formaldehyde condensate and its application as a superplasticizer in concrtet,” Cem. Concr. Res., 30, (2000) 1841.
連結：
6. Ramachandran, V. S., and Feldman, R.F., “Superplasticizers,” in Concrete Admixture Handbook, Ramachandran, V. S. Edt., Noyes,New Jersey (1984).
連結：
7. K. Yamada, T. Takahashi, S. Hanehara and M. Matsuhisa, “Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer,” Cem. Concr. Res., 30, (2000) 197
連結：
8. 葉一賢, 新型聚羧酸系PMAMP強塑劑的合成與應用, 國立台灣師範大學化學研究所碩士論文，(2002).
連結：

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