1. Product introduction:
JH-FL low-bleeding, micro-expansion grouting agent is a new type of admixture based on inorganic functional materials and compounded with organic polymer functional materials. The product has multiple functions such as efficient water reduction, reinforcement, plastic retention, micro-expansion and low bleeding. When mixed into cement or concrete, it can not only greatly improve the fluidity of grouting at a low water-cement ratio, but also effectively solve the problem of The contradiction between the high fluidity and segregation resistance of multi-phase, multi-combination and non-uniform mixing systems such as cement and concrete can greatly reduce the phenomenon of bleeding. At the same time, the incorporation of the product can also cause moderate expansion to compensate for the shrinkage of hardened cement slurry or concrete at different times.
2. Scope of application:
This product is suitable for the construction of various tunnel grouting materials (including cement slurry, mortar, concrete), especially post-tensioned bonded prestressed concrete tunnels. Construction of grouting materials.
3. Main technical performance indicators and characteristics:
1. The product has efficient water reduction and enhanced functions. The recommended dosage is 10-15%, and the water reduction rate exceeds 15%. The grouting material mixed with 13% JH-FL has a flow cone time of 14-18 seconds and a strength level of 20-50Mpa. It has high fluidity and good groutability. Even with complex structures in special-shaped parts, the grout Can freely fill all parts of the pores and achieve self-compacting;
2. Bleeding rate ≤1%. Due to the use of functional organic polymer materials, the viscosity of the system is appropriately increased while maintaining high fluidity of the slurry, thereby effectively avoiding settlement separation and preventing water from migrating to the upper part of the slurry causing slurry defects;
3. The slurry mixed with JH-FL will produce moderate micro-expansion at different stages of hydration and hardening to compensate for the sexual shrinkage, drying shrinkage and own volume shrinkage of the cement system, and the early volume expansion is ≤1% , the dry shrinkage rate in the later period is ≤5×10, and the long-term volume stability is good. It can effectively improve the interface bonding between the grouting material and the steel, improve the grouting quality, improve the constructability and save construction costs;
4 . It has the ability to moderately retard and maintain fluidity, fully ensuring the time required for grouting construction. The ratio of its retarding and slump-preserving components is adjusted accordingly according to seasonal changes, so it can meet the needs of construction in different seasons;
5. The product is non-toxic, non-radiative, and has no rust on steel.
4. Scope of application:
JH-FL low-bleeding, micro-expansion grouting agent is suitable for ordinary Portland cement, Portland cement, slag Portland cement, fly ash The cement slurry, cement mortar and cement concrete grouting materials configured with cement grouting materials are especially suitable for the construction of post-tensioned bonded prestressed concrete and tunnel grouting materials in large-scale projects such as highways, bridges, and nuclear power plants.
5. Usage methods and precautions:
1. The cement used must be qualified, especially it must not be damp or agglomerated;
2. An acid test must be carried out before use. Determine the best proportion, the recommended dosage is 10-15%;
3. Accurate measurement, appropriately extend the mixing time to ensure that the components of the grouting material are evenly dispersed;
4. The product shelf life is one year, and the storage process Pay attention to sun protection and moisture protection.
6. Product packaging:
JH-FL low-bleeding, micro-expansion grouting agent is packaged in double-layer plastic composite bags, which have certain moisture-proof capabilities. Each bag has a net weight of 40 kg and is easy to transport. . </p
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