Nestle Nikolaus, Galvosas Petrik, Zimmermann Christian, Stallmach Frank, Kärger Jörg
Universität Leipzig, Abteilung Grenzflächenphysik, Linnéstrasse 5, D-04103 Leipzig, Germany.
Environ Sci Technol. 2004 Feb 1;38(3):880-5. doi: 10.1021/es034444h.
The behavior of nonwatery solvent phases in hydrating cement pastes is of great interest in the context of solidification of wastes containing such phases. In a recent study, the influence of various solvents on the hydration kinetics of cement was studied. In this paper, we present results on the changes in the behavior of the solvent phases themselves during setting of the cement pastes. The methods used in the studies were NMR relaxometry and pulsed field gradient (PFG) NMR diffusometry. To study selectively the behavior of the non-aqueous-phase liquid (NAPL) phases, heavy water was used in the preparation of the cement pastes. The experimental results are in good agreement with the observations from earlier studies concerning the behavior of toluene in hydrating cement. For aliphatic solvents (cyclooctane, n-hexanol), indications for surprisingly large networks of connected droplets in the cement matrices are found.
在含非水溶剂相废物固化的背景下，水合水泥浆体中非水溶剂相的行为备受关注。在最近的一项研究中，研究了各种溶剂对水泥水化动力学的影响。在本文中，我们展示了水泥浆体凝结过程中溶剂相自身行为变化的结果。研究中使用的方法是核磁共振弛豫测量法和脉冲场梯度（PFG）核磁共振扩散测量法。为了选择性地研究非水相液体（NAPL）相的行为，在制备水泥浆体时使用了重水。实验结果与早期关于甲苯在水合水泥中行为的研究观察结果高度一致。对于脂肪族溶剂（环辛烷、正己醇），在水泥基体中发现了令人惊讶的大尺寸连通液滴网络的迹象。
