Guangdong Shijia Gaojian Building Materials Technology Co., Ltd., a professional manufacturer specializing in the production and research of reinforcement and repair materials.
High-strength polymer mortar is a new type of concrete repair mortar that combines the adhesive properties of high polymer materials with the durability of inorganic materials; it boasts high compressive strength, rapid curing, and excellent bonding properties. It has excellent water retention and crack resistance, high alkaline resistance, and UV resistance. It is easy to handle, can be applied on moist substrates, and is environmentally friendly and healthy. It simplifies and facilitates the construction process, ensures durability in sync with concrete, shortens the construction period, and ensures cost-effectiveness.
I. Application Scope
Suitable for concrete structure repairs in industrial, municipal, bridge, and residential construction.
II. Categories
Polymer-modified materials for concrete structural repairs are categorized into single-component and double-component types.
Single-component: "Composed of cement, fine aggregates, polymer powder, and additives;
Two-component: Composed of powdered materials consisting of cement, fine aggregates, polymer emulsion, and additives.
Three performance indicators
High-strength polymer mortar is divided into three categories.
Structural Repair Specific: Designed for the repair of concrete structures with compressive strength grades below C60.
Special for steel strand wire mesh: Suitable for reinforced layer with polymer mortar.
High-Speed Rail Specific: Suitable for repairing concrete structures of prestressed beams and track slabs on high-speed railways, especially for strength grades C50 and above.
Serial Number | Project | Technical Specifications | |||
Structural Repair-Specific | Steel strand for special use | High-speed Rail-Specific | |||
1 | Appearance | Powder is uniform and free of lumps. Liquid is well-mixed without sediment. | |||
2 | Viscosity mm | 50-80 | |||
3 | Setting Time | Initial Set | ≥45 | ≥45 | ≥45 |
Final Set | ≤24 | ≤24 | —— | ||
4 | Compressive Strength MPa | 7d | ≥20.0 | ≥30.0 | 8h≥25.0 |
28d | ≥60.0 | ≥60.0 | ≥60.0 | ||
5 | Flexural strength MPa | 7d | ≥8 | ≥6 | 24h≥10 |
28d | ≥12 | ≥10 | —— | ||
6 | Bond strength, tensile MPa | 28d | ≥2.5 | ≥2.5 | ≥2.5 |
7 | Shrinkage rate % | 28d | ≤0.1 | ≤0.1 | ≤0.1 |
*Note 1: For materials requiring rapid setting and early strength, the setting time will be determined separately by both parties. *Note 2: If the tensile bond strength of the mortar body does not meet the requirements of Table 1, it can be used in conjunction with an interface agent. *Note 3: Requirements for durability indicators should refer to the execution of GB/T 50476 Specification for Durability Design of Concrete Structures. | |||||
I. Application
The reinforcement method using stainless steel wire mesh is suitable for reinforcing all structures prone to bending. Particularly applicable to representative bending structures in civil engineering, such as the flat beams of reinforced concrete bridges, it is also used in the central parts of bridge piers and the main tower axes, as well as on the cracking sections of roads. It maintains the same system as previous reinforced concrete structures. The basic principle of this reinforcement method is that the stainless steel wire mesh is adhered to the original concrete through a highly permeable aggregate mortar with excellent bonding and bending strength, forming an integrated whole. The stainless steel wire mesh increases rigidity, enhancing load-bearing capacity while preventing durability reduction caused by the aggregate mortar.
2. When concrete shows honeycomb, holes, cracks, or defects like broken protective layer and exposed steel reinforcement, it can be repaired and reinforced with polymer mortar patches; thickening the protective layer, leveling uneven surfaces, and repairing old concrete surfaces; enhancing the durability of concrete and extending its lifespan; offering excellent impermeability, crack resistance, aging resistance, and alkali resistance; and having good adhesion to various materials.
II. Usage
1. Surface requirements and treatment: The base surface should be flat, rough, clean, and free of oil stains and floating dust. There should be no sanding, hollowing, or cracking. Before construction, it should be washed with high-pressure water and kept moist, but no standing water is allowed. For bonding, a primer can be applied beforehand.
Material Preparation: Weigh and mix powder and water in a mass ratio of 100:13. Add 90% of the actual water amount to the powder and mix well. Then, gradually add the remaining 10% water while stirring to ensure no lumps form. The mixed slurry should be used up within 0.5-1 hour.
3. Construction: First, apply an interface treatment agent (ratio of A:B = 3:1) evenly on the wet concrete base surface. Do not exceed a large area for one-time polymer mortar application; construction should be done in strips and blocks, with each block not exceeding 10 square meters. The interval between staggered construction should be no less than 24 hours. When applying in layers, the gaps should be staggered from each other.
4. After polymer mortar is spread, it should be pressed and leveled in one go, avoiding repeated pressing. If bubbles appear, they should be pierced and compacted, ensuring a dense surface. For face layers on vertical or overhead surfaces thicker than 10mm, layering is recommended. The thickness of each layer should be between 5-10mm, and the next layer can be applied only after the previous one is touch-dry.
