Formation of calcium aluminate hydrates in Portland cement modified by organic admixtures
Formation of calcium aluminate hydrates in Portland cement modified by organic admixtures
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有机外加剂改性硅酸盐水泥中铝酸钙水合物的形成
DOI：
10.1680/jadcr.15.00081
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发表时间：
2017-03
影响因子：
2
通讯作者：
Yu Long
中科院分区：
文献类型：
--
作者：
Zhang Guofang;Wang Peiming;Xu Linglin;Li Haoxin;Yu Long
采用X射线衍射分析方法研究了羟乙基甲基纤维素（HEMC）和乙烯-醋酸乙烯酯可再分散聚合物（伊娃）两种有机外加剂对波特兰水泥浆体中水化铝酸钙形成的影响。结果表明，HEMC和伊娃均能延缓钙矾石的形成，推迟达到最大钙矾石含量的时间。然而，这两种有机掺合料增强了钙矾石的稳定性，并延迟了钙矾石向单硫酸盐（AFm）的转化，以在后期水化时间保持较高的钙矾石含量。以伊娃中的方解石粉为防结块剂，伊娃在水化3 d后促进了AFm两种相的形成，即半碳铝酸盐和单碳铝酸盐。因此，在用伊娃改性的水泥浆体中共存的铝酸钙水合物的类型多于在对照浆体中或在用HEMC改性的水泥浆体中。同时，在T...
The formation of calcium aluminate hydrates in Portland cement pastes modified with two organic admixtures, hydroxyethyl methyl cellulose (HEMC) and ethylene-vinyl acetate redispersible polymer powder (EVA), was evaluated by using X-ray diffraction analysis. The results show that both the HEMC and the EVA retard the formation of ettringite and postpone the time to reach maximum ettringite content. However, the stability of ettringite is enhanced and the conversion of ettringite to monosulfate (AFm) is delayed by these two organic admixtures to retain a higher ettringite content in cement pastes at later hydration time. With calcite powders contained in EVA as the anti-blocking agents, the formation of two AFm phases, hemicarboaluminate and monocarboaluminate, is promoted by EVA after 3 d of hydration. Accordingly, more types of calcium aluminate hydrates coexist in the cement paste modified with EVA than in the control paste or in cement paste modified with HEMC. Also, having been synchronously mixed in t...
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影响因子：
11.4
作者：
Deschner, Florian;Winnefeld, Frank;Neubauer, Juergen
通讯作者：
Neubauer, Juergen
影响因子：
11.4
作者：
Pourchez, J.;Grosseau, P.;Ruot, B.
通讯作者：
Ruot, B.
影响因子：
11.4
作者：
D. A. Silva;P. Monteiro
通讯作者：
D. A. Silva;P. Monteiro
影响因子：
7.4
作者：
Betioli, A. M.;Hoppe Filho, J.;Pileggi, R. G.
通讯作者：
Pileggi, R. G.
影响因子：
11.4
作者：
Silva, DA;Roman, HR;Gleize, PJP
通讯作者：
Gleize, PJP