Brief Introduction to Concrete Surface Protective Agent
Key words
Concrete protectant, surface protectant, cement, protectant, sodium silicate, acrylic paint, TEOS
The waterproof mechanism of the concrete protective agent is to produce a chemical reaction with the free alkali in the concrete to form a stable dendritic crystal colloid, which can effectively block the micro cracks and capillary voids inside the concrete, so that the concrete structure has a durable waterproof function and better Density and compressive strength. The penetration depth is up to 20-30mm, and it can also effectively prevent the erosion of concrete by acidic substances, oil stains and engine oil. It can be used for the protection of concrete base surface, waterproof, anti-seepage and anti-corrosion, etc. in any situation.
During use, concrete materials will be affected by external environmental factors for a long time, and will be corroded or damaged for a long time; such as chloride ion corrosion, carbonation corrosion, freeze-thaw erosion, etc.; in order to protect concrete materials from external erosion, concrete surface protection The agent came into being.
Preservatives for resinous coatings such as epoxy, polyurethane, acrylic, chlorinated rubber, and vinyl. It protects the concrete structure from the invasion of external harmful media by painting a certain thickness of coating film on the concrete surface.
As a hydrophobic surface protective agent, silane can form a hydrophobic layer on the surface of cement-based materials, hindering the entry of external water, thereby reducing harmful ions from entering the interior of cement-based materials.
Bitumen can be used as a surface coating protectant, which forms a protective layer on the surface of cement-based materials to prevent the entry of harmful substances from the outside.
Liquid sodium silicate is mainly used in construction accelerators.
Sodium silicate, as a permeable crystalline surface protective agent, is used as a concrete quick-setting agent and waterproofing agent. It can react with the hydration products of cement-based materials to generate calcium silicate hydrate, which makes the surface dense and prevents external harmful ions Enter.
Ethyl orthosilicate (TEOS) is an organic compound with a chemical formula of C8H20O4Si, a colorless liquid, slightly soluble in water. It is characterized by high surface tension and fast penetration speed, so it can generate ethanol and silicic acid in the hydrolysis reaction inside the cement structure, and can react with Ca+ in cement and calcium hydroxide, the hydration product, to form crystals or calcium silicate hydrate. Glue (C-S-H gel) plugs pores and cracks. It has good waterproof performance and protection performance.
