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Pore Structure as a Response to the Freeze/Thaw Resistance of Mortars

机译：孔隙结构对砂浆抗冻融性的响应

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In this paper, the resistance to the freeze/thaw cycles for four groups of mortars (lime—LM, lime based—LBM, cement—CM, and aerated cement—ACM mortars) with different amount of mortar components within each group is quantified via a ratio of flexural/compressive strength after and before exposure to freeze/thaw cycles. Using a pore system obtained by three different methods (mercury intrusion porosimetry, X-ray micro-computed tomography analysis, and SEM (Scanning Electron Microscopy) analysis), an attempt was made to explain why some mortars achieved better resistance to freeze/thaw cycles than others. The mortars with lime as a binder in the composition (LM and LBM groups) did not survive the freezing and thawing regime, while no visible damage was recorded in samples of the CM and ACM group. It is concluded that the low initial value of the mechanical properties of the LM and LBM mortars, as well as the higher proportion of harmful pores (pores greater than 0.064 μm) compared to CM and ACM mortars are responsible for their poor durability. According the results of nanotomography, it is concluded that the most important factor influencing freeze/thaw resistance is pore connectivity—the higher the connectivity of the macropores, the higher the freeze/thaw resistance of the mortar. SEM analysis proved to be a very useful method for aerated cement mortars as it revealed the pore sizes that were not covered by mercury porosimetry and nanotomography.
机译：在本文中，通过每组不同量的砂浆组分定量分析了四组砂浆（石灰-LM，石灰基-LBM，水泥-CM和充气水泥-ACM砂浆）的抗冻融能力。暴露于冷冻/解冻循环之后和之前的弯曲/抗压强度之比。使用通过三种不同方法（水银压入孔隙率法，X射线计算机断层扫描分析和SEM（扫描电子显微镜）分析）获得的孔隙系统，试图解释为什么一些砂浆具有更好的抗冻融性相对于其它的。在组合物（LM和LBM组）中，以石灰为粘合剂的灰浆在冷冻和融化状态下无法幸存，而CM和ACM组的样品中未发现可见的损坏。结论是，与CM和ACM砂浆相比，LM和LBM砂浆的机械性能初始值较低，以及有害孔隙（孔径大于0.064μm）的比例较高，这是其耐用性差的原因。根据纳米断层扫描的结果，可以得出结论，影响抗冻融性的最重要因素是孔的连通性-大孔的连通性越高，砂浆的抗冻融性越高。 SEM分析被证明是加气水泥砂浆的一种非常有用的方法，因为它揭示了水银孔率法和纳米断层仪无法覆盖的孔径。

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