Current understanding of cellulose ethers impact on the hydration of C3A and C3A-sulphate systems
Current understanding of cellulose ethers impact on the hydration of C3A and C3A-sulphate systems
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DOI：
10.1016/j.cemconres.2009.05.009
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发表时间：
2009-08-01
影响因子：
11.4
通讯作者：
Ruot, B.
中科院分区：
文献类型：
--
作者：
Pourchez, J.;Grosseau, P.;Ruot, B.
研究了纤维素醚 (CE) 对 C(3)A 水化的影响，以支持对 CE 对水泥水化的延迟作用的理解。从这个意义上说，我们相继研究了钙矾石和氢铝酸钙上的CE吸附，然后研究了在存在或不存在硫酸钙的情况下CE对C(3)A水合过程的影响。我们强调 CE 的相特异性吸附取决于 CE 化学。此外，除了 CE 之外，我们还强调了 C(3)A 溶解以及钙矾石和氢铝酸钙沉淀的逐渐减慢。我们再次注意到 CE 化学和 CE 吸附行为的巨大影响。因此，HEC 总是比 HPMC 诱导更强的氢铝酸钙吸附和更长的 C3A 水合延迟。 (C) 2009 Elsevier Ltd. 保留所有权利。
The impact of cellulose ethers (CE) on C(3)A hydration was examined to support the understanding of the retarding effect of CE on cement hydration. In this sense, we successively studied the CE adsorption on ettringite and calcium hydroaluminates, and then the CE influence during C(3)A hydration in presence or absence of calcium sulphate. We emphasized a phase-specific adsorption of CE depending on CE chemistry. Besides, in addition of CE, we highlighted a gradual slowing down of C(3)A dissolution as well as ettringite and calcium hydroaluminates precipitation. Again, a great impact of CE chemistry and CE adsorption behaviour were noticed. Thus, HECs induce always a stronger adsorption on calcium hydroaluminates and a longer C3A hydration delays than HPMCs. (C) 2009 Elsevier Ltd. All rights reserved.