Comparison of mechanical abrasion on silicate-coated fresh concrete (left) and hardened concrete (right). The hardened concrete was silicate after 14 days. The results relate exclusively to the test items used here. A further disadvantage on fresh treated concrete is clearly evident when it comes to capillary water absorption. Less absorbed silicate means that more small cavities remain empty. This means that due to the capillary effect surfacewater ismore strongly absorbed by the concrete. Conclusion: As the silicate absorption, as well the resulting reduction of capillary water absorption and reduction of mechanical water resistance get clearly indicated with this study, a treatment with silicate on hardened concrete should be preferred. 49 0,0 1,0 2,0 3,0 4,0 0 10 20 30 40 50 60 Water absorption [ml] time [min] capillary water absorption of fresh concrete to hardened concrete (14 days) Sodium silicate 56% reduction solid concrete reference fresh concrete
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