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2. Silicon organic water repellent - Wikipedia

   en.wikipedia.org/wiki/Silicon_organic_water...

   for concrete, asbestos, gypsum, ceramic, porcelain; in the production of waterproof papers and leather; in the production of water-resistant fabrics; by volumetric method in the manufacture of paving tiles, slabs, curbs, fences of different silicate materials; as plasticizer in the preparation of plaster, lime and cement solutions;

3. Sodium dichloroisocyanurate - Wikipedia

   en.wikipedia.org/wiki/Sodium_dichloroisocyanurate

   Sodium dichloroisocyanurate (INN: sodium troclosene, troclosenum natricum or NaDCC or SDIC) is a chemical compound widely used as a cleansing agent and disinfectant. [1] It is a colorless, water-soluble solid, produced as a result of reaction of cyanuric acid with chlorine.

4. Cleaning agent - Wikipedia

   en.wikipedia.org/wiki/Cleaning_agent

   For acid-resistant building facades, such as brick, acids are typically used. These include mixtures of phosphoric and hydrofluoric acids as well as surfactants. For acid-sensitive facades such as concrete, strongly alkaline cleaners are used such as sodium hydroxide and thickeners. Both types of cleaners require a rinsing and often special ...

5. Hexafluorosilicic acid - Wikipedia

   en.wikipedia.org/wiki/Hexafluorosilicic_acid

   The application of hexafluorosilicic acid to a calcium-rich surface such as concrete will give that surface some resistance to acid attack. [13] CaCO 3 + H 2 O → Ca 2+ + 2 OH − + CO 2 H 2 SiF 6 → 2 H + + SiF 2− 6 SiF 2− 6 + 2 H 2 O → 6 F − + SiO 2 + 4 H + Ca 2+ + 2 F − → CaF 2. Calcium fluoride (CaF 2) is an insoluble solid ...

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7. Sulfate attack in concrete and mortar - Wikipedia

   en.wikipedia.org/wiki/Sulfate_attack_in_concrete...

   Oxidation of pyrite in clay formations in contact with concrete – this produces sulfuric acid which reacts with concrete. Bacterial activity in sewers – anaerobic sulfate reduction at work in the organic-rich sludges accumulated under water in the conduits produces hydrogen sulfide gas (H 2 S).