Hydrophobization lessens the water absorption by facade materials and is thus presumed to reduce moisture problems in internally insulated facades. However, to do this it should retain the water repellency performance throughout aging. The aim of this study is to evaluate the impact of aging on the durability of the hydrophobic treatment on bricks and mortars. The resulting absorption coefficient, after 635 repeating artificial aging cycles of alternating UV radiation (102 min) and water exposure (18 min) reveals that the hydrophobic layer maintains its water repellency performance both in brick and mortar. The samples were treated with two different water repellent agents in different concentrations and tested for capillary water uptake. Additionally, the findings show that cycles of weathering could contribute positively to further reduction of the absorption coefficient of hydrophobized brick and mortar samples. Subsequently, Karsten tube tests on samples from artificial aging illustrate the same water repellency performance as mock-up walls exposed to ambient conditions, six years after being hydrophobized. Contact angle measurements before and after artificial aging reveal that the beading effect declines through aging. However, the beading effect seems to be just a surface effect affected by UV-light. Moreover, after aging, hydrophobized brick and mortar samples, tested by visual inspection, maintain their appearance while untreated samples show signs of efflorescence. In total, these findings indicate that the water uptake of hydrophobized brick or mortar remains very low after aging including water spraying and UV light.

疏水化减少了外墙材料的吸水率，因此被认为可以减少内部隔热外墙的潮湿问题。然而，要做到这一点，它应该在整个老化过程中保持防水性能。本研究的目的是评估老化对砖和砂浆疏水处理耐久性的影响。在交替的紫外线辐射（102 分钟）和水暴露（18 分钟）的 635 次重复人工老化循环后，所得的吸收系数表明疏水层在砖和砂浆中均保持其防水性能。样品用两种不同浓度的防水剂处理，并测试毛细管吸水率。此外，研究结果表明，风化循环可能有助于进一步降低疏水化砖和砂浆样品的吸收系数。随后，对人工老化样品进行的 Karsten 管测试表明，在疏水化 6 年后，其防水性能与暴露在环境条件下的模型墙相同。人工老化前后的接触角测量表明，珠粒效应随着老化而下降。然而，珠状效果似乎只是受紫外线影响的表面效果。此外，老化后，疏水化砖和砂浆样品，通过目测测试，保持其外观，而未经处理的样品显示风化迹象。总共，