● Product Introduction

　　SY-FAE composite fiber-reinforced crack resistant agent implementation standards: GB23439-2017, JC474-2008. Our company, in collaboration with multiple universities, has developed a new type of composite concrete admixture based on the needs of structural design in construction projects. The product uses ettringite, CaO, and MgO three-source expansion. The three expand appropriately, interact with each other, and complement each other's strengths to obtain a suitable expansion amount and expansion performance, effectively preventing early, mid-term, and late cracking of concrete, and better compensating for the shrinkage of concrete structures. Using this product, high-strength, high-crack resistance, high-impermeability, high-impact resistance, and high-durability high-performance concrete can be prepared. It is widely used in shrinkage-compensating concrete, mass concrete, and other projects, and can achieve ultra-long seamless construction operations.

Mechanism of Action

① Free calcium oxide in the product forms Ca(OH) in the early stage of hydration ₂ producing micro-expansion, mainly occurring in the early stage; ettringite is in crystalline and gel form in the pores of the concrete, and its crystal growth and water absorption micro-expansion constitute the expansion source of the concrete, and the expansion effect mainly occurs in the middle stage; MgO hydration generates Mg(OH) ₂ volume increase, and the expansion it provides occurs in the later stage. The three expansion sources can make the expansion curve of the concrete develop in coordination with the strength curve of the concrete, which is conducive to the effective performance of the expansion performance and avoids early, mid-term, and late cracking of the concrete.

② Several functional materials in this product complement each other in improving the durability of concrete, producing a super-additive effect. The high-performance crack-resistant fibers in the product have high tensile strength and good compatibility with cementitious materials. A large number of high-performance fiber monofilaments form a random support system inside the concrete, effectively preventing the segregation of aggregates and ensuring the uniformity of the concrete mixture, thereby inhibiting the formation of settlement cracks. At the same time, the random distribution of a large number of fiber monofilaments helps to weaken the stress concentration produced by the plastic shrinkage and freeze-thaw of concrete. The energy generated by concrete shrinkage is dispersed to the fiber monofilaments, effectively enhancing the toughness of the concrete structure and inhibiting the generation and development of micro-cracks inside the structure.
③ After the concrete containing SY-FAE composite fiber-reinforced crack resistant agent hardens, the high-performance crack-resistant fiber monofilaments are bonded together to form a dense network-like reinforcement system and are closely combined with the cement-based material, greatly maintaining the overall strength of the concrete. When the concrete structure is impacted, the fiber reinforcement system absorbs a large amount of energy, effectively reducing the impact stress and hindering the rapid expansion of impact cracks, enhancing the impact resistance and seismic resistance of the concrete structure.

Technical Indicators

① Usage amount: 4%~10% of the total amount of cementitious materials in concrete.

② Limited expansion rate: ≥0.035% in Type I water for 7d, ≥0.05% in Type II water for 7d.

③ Compressive strength: ≥22.5MPa for 7d, ≥42.5MPa for 28d.

④ Setting time: Initial setting ≥45min, final setting ≤10h.

⑤ Permeability grade: Can reach P30 or above.

⑥ High elastic modulus, high wear resistance, wear resistance increased by more than 50% compared to the benchmark cement.

⑦ The product is non-toxic, odorless, and environmentally friendly.

● Scope of Application

① Widely used in waterproof projects, highway pavements, tunnels, ports, dam reservoirs, and projects with special requirements for impermeability and crack resistance.

② Especially suitable for preparing shrinkage-compensating concrete, rigid structure self-waterproof concrete, ultra-long, ultra-wide, and ultra-thick reinforced concrete structure seamless design and construction, mass concrete, and other special projects and parts with crack resistance and waterproofing requirements.

● Instructions for Use

① The concrete mix design is the same as the benchmark concrete. The specific amount of this product is determined according to the construction requirements and the properties of the raw materials through trial mixing. Different parts of different projects should have different dosage requirements.

② Accurate measurement and uniform mixing are required when adding this product.

③ When mixing concrete with this product, the mixing time should be appropriately extended to ensure that the concrete mixture is mixed evenly.

④ Continuous pouring of concrete, no over-vibration, no under-vibration, uniform and dense consolidation should be ensured.

⑤ The curing method is basically the same as that of ordinary concrete. Strengthen the troweling and finishing before the final setting of the concrete, and immediately moisturize after the final setting. Moisture and heat preservation curing, the specified curing time shall not be less than 14d.

⑥ For concrete in winter casting or large-scale ultra-long structural projects, heat preservation and moisture preservation curing should be carried out according to the code requirements.

● Packaging and Storage

①This product is packaged in a film-lined woven bag, with specifications of 25±0.5kg/bag or 50±1kg/bag. Handle with care during transportation to prevent damage to the packaging bag.

②The product should be stored in a dry place, protected from sun exposure and moisture.

③The product has a shelf life of six months. After the expiration date, it must be retested before use.