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首页> 外文期刊>Cement and Concrete Research >The influence of different drying methods on cement paste microstructures as reflected by gas adsorption: Comparison between freeze-drying (F-drying), D-drying, P-drying and oven-drying methods
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The influence of different drying methods on cement paste microstructures as reflected by gas adsorption: Comparison between freeze-drying (F-drying), D-drying, P-drying and oven-drying methods

机译：气体吸附反映出不同干燥方法对水泥浆微结构的影响：冷冻干燥（F-干燥），D-干燥，P-干燥和烘箱干燥方法的比较

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摘要

Drying of cement pastes is required prior to microstructure investigation by means of gas adsoiption technique. An ideal drying method, which would give reproducible results that could perfectly remove only the non-bound water and, at the same time, preserve the microstructure, unfortunately does not exist. The different drying methods used affect the microstructures in different ways. However, an effective water removal and, less damaging drying method between the common methods used would be still of outstanding importance for sample preparation. Many drying methods have been investigated in the past for such a purpose, and a good agreement for the best drying method does not exist. The so-called D-drying method is being used in many laboratories as the "best" method for drying cement pastes. The surface areas and pore size distributions results of the current work confirm that D-drying (D-Drying C~(-t)) is a relatively good preservation and effective drying method, and that Freeze-drying gives slightly better results compared to D-drying (CT~(-t)) and other methods. However the short time versions of some of these methods indicate the presence of very few "micropores", which are not present with prolonged drying times. The outgas level is also a very important variable affecting the gas adsoiption measurements especially in the case of short duration drying conditions, as indicated by the results of this work.
机译：在通过气体吸附技术进行微观结构研究之前，需要对水泥浆进行干燥。理想的干燥方法会产生可重复的结果，可以完美地去除未结合的水，同时保留微观结构，但不幸的是不存在。所使用的不同干燥方法以不同的方式影响微观结构。然而，对于所用样品的制备，有效的除水方法和较少使用的常见干燥方法之间的破坏性仍然至关重要。过去已经为此目的研究了许多干燥方法，并且对于最佳干燥方法尚无良好的协议。所谓的D-干燥法在许多实验室中被用作干燥水泥浆的“最佳”方法。当前工作的表面积和孔径分布结果证实了D-干燥（D-Drying C〜（-t））是一种相对较好的保存和有效的干燥方法，与D相比，Dry-drying的干燥效果更好。 -干燥（CT〜（-t））等方法。然而，其中一些方法的短时间版本表明存在很少的“微孔”，而延长的干燥时间则不存在。这项工作的结果表明，废气水平也是影响气体吸附测量的非常重要的变量，特别是在短期干燥条件下。

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