1. Product content
JH-7 high-efficiency ultra-early strength water-reducing agent is a composite admixture based on graft-type high-efficiency water-reducing agent and a variety of inorganic materials. It has the characteristics of large water reduction, ultra-early strength Strong and highly enhanced characteristics. The water reduction rate of the product reaches more than 20%, the 1d compressive strength of concrete can be increased by 110-230%, the 3d compressive strength can be increased by 60-130%, and the 28d compressive strength can be increased by 30-50%. The product has certain frost resistance, and the lowest construction temperature of concrete can reach -5℃. The product can also effectively improve the pore structure of concrete, increase the density of concrete, and improve the properties of concrete such as flexural resistance, frost resistance, carbonization resistance, and corrosion resistance.
2. Recommended dosage
The commonly used dosage of this product is 1.5-2.0% of the cement dosage. The user can determine the appropriate dosage based on experiments.
3. Scope of application
This product has good adaptability to cement and can be widely used in concrete projects with ultra-early strength and high reinforcement requirements, highway bridges, tunnels, thermal power plants, winter construction concrete projects and concrete precast Components.
IV. Matters needing attention
1. The water, sand and stone used to prepare concrete should meet the quality and scale requirements in the relevant specifications. Necessary testing and trial matching work should be carried out to determine the suitable blending of this product. quantity.
2. The measurement of JH-7 high-efficiency ultra-early strength water-reducing agent should be strictly controlled during trial preparation and actual production. If the dosage is too small, the water-reducing effect will not be achieved, and if the dosage is too large, it may If it causes bleeding or segregation, the recommended dosage is 1-1.5% of the cementitious material.
3. When using porous aggregates to prepare concrete, the "post-infiltration method" should be used to incorporate the JH-7 high-efficiency ultra-early strength water-reducing agent to prevent the water-reducing agent from being adsorbed by the aggregate and affecting its effect.
4. When constructing concrete mixed with this product, the time from discharging to pouring should be shortened as much as possible to reduce the slump loss of the mixture. When the concrete needs to be transported for a long time or transported using a mixing tank truck, secondary mixing on site or combined use with a retardant should be considered to ensure that the concrete still has good workability during pouring. If construction is carried out in summer, it is better to choose JH-F7.
5. Packaging and storage:
JH-7 high-efficiency super early strength superplasticizer powder is packed in woven bags (lined with plastic film), each bag is 40 ± 0.5 kg. The liquid agent is packed in plastic barrels, and the weight of each barrel is 230±2 kg. This product should be protected from moisture and sun exposure. Although moisture does not affect the quality, its moisture content should be removed, crushed and destroyed before sieving before use. </p
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