快硬地面自流平砂浆的早期收缩与膨胀机理

Mechanisms of Early Shrinkage and Expansion of Fast Setting Flooring Compounds

快硬自流平砂浆的凝结和硬化在数小时内完成,随后这种薄层砂浆的干燥一般会在第一天后停止。为了研究早期收缩和膨胀的动态行为,我们开发了一种特殊的装置,它带有两个平行对准放置的激光器。该实验装置可以研究配方中的不同组份以及这些组份对收缩和膨胀的不同阶段即塑性收缩、凝结膨胀和干燥收缩所产生的影响。膨胀/收缩行为主要取决于两种因素,即外部因素(气候)和内部因素(配方)。对于后者而言,凝结的开始、加强和持续的时间是影响整个收缩/膨胀行为的关键所在。

Fast setting self-leveling flooring compounds set and harden within a couple of hours and subsequent drying of the thin mortar layer is generally terminated after the first day. In order to investigate the dynamics of early shrinkage and expansion we developed a special set-up of two laser units which are horizontally aligned. This allows to investigate the different parameters and their influences onto the different stages of shrinkage and expansion, namely plastic shrinkage, setting expansion and drying shrinkage. The shrinkage/expansion behavior is strongly related to both, external (climate) and internal (formulation) factors. With respect to the latter, onset, intensity and duration of setting are key to the overall shrinkage/expansion behavior.