Moro F, Böhni H
Institute of Materials Chemistry and Corrosion, Swiss Federal Institute of Technology, CH-8093 Zürich, Switzerland.
J Colloid Interface Sci. 2002 Feb 1;246(1):135-49. doi: 10.1006/jcis.2001.7962.
Mercury intrusion porosimetry (MIP) is a widely used method for studying porous materials, in particular, cement-based materials. The usual interpretation of such measurements is based on certain assumptions. One of these is that each pore is connected to the sample surface directly or through larger pores. Pores not meeting this assumption are called ink-bottle pores. The effect that sample size has on the MIP characteristics of concrete samples, like the ink-bottle effect and hysteresis, was studied by measuring additional extrusion and intrusion cycles. In order to characterize the extrusion and ink-bottle behavior, the amount of entrapped mercury chi(p) was estimated. Superimposition of extrusion and second intrusion curves is achieved if the contact angle theta is adjusted from theta(i), the intrusion contact angle, to theta(e), the extrusion contact angle. The threshold radius is often assumed to be a dominant pore radius, yet in this study the entrapped mercury content shows no evidence for the presence of a dominant pore radius. Even if characteristic properties of cement-based materials can be estimated with MIP, comparison of results is rendered difficult by the significant effects of sample preparation techniques and sample size and the ink-bottle effect due to randomly present air bubbles.
压汞法（MIP）是一种广泛用于研究多孔材料，特别是水泥基材料的方法。对此类测量结果的通常解释基于某些假设。其中之一是每个孔隙都直接或通过较大的孔隙与样品表面相连。不符合此假设的孔隙称为墨水瓶形孔隙。通过测量额外的挤出和侵入循环，研究了样品尺寸对混凝土样品MIP特性（如墨水瓶效应和滞后现象）的影响。为了表征挤出和墨水瓶行为，估算了截留汞量χ(p)。如果将接触角θ从侵入接触角θ(i)调整为挤出接触角θ(e)，则可实现挤出曲线和第二次侵入曲线的叠加。阈值半径通常被认为是主要孔隙半径，但在本研究中，截留汞含量并未显示出存在主要孔隙半径的证据。即使可以用MIP估算水泥基材料的特性，但由于样品制备技术、样品尺寸的显著影响以及随机存在的气泡导致的墨水瓶效应，结果的比较变得困难。
