concrete expansion agent

Product introduction

Concrete expansion agent is used to prepare expansion concrete (including shrinkage-compensating concrete and self-stressing concrete). Shrinkage-compensating concrete has the function of compensating concrete dry shrinkage and dense concrete, and improving the impermeability of concrete. It is mainly used in civil engineering for both waterproofing and crack resistance. In this regard, the most commonly used occasions are to prepare high-grade waterproof concrete and appropriately extend the spacing of expansion joints or post-casting belts.

Scope of application

Underground buildings: such as subways, underground parking lots, underground warehouses, tunnels, mines, civil air defense projects, foundation pits, etc.;

Pools, swimming pools, water towers, storage tanks, large containers, granaries, oil tanks, warehouses in caves, etc.;

High-strength highway pavements, bridge concrete surfaces, culverts, etc.;

Prefabricated components, anchoring of frame structure joints, pipe joints, grouting materials for post-tensioned prefabricated components, backfilling of post-cast joints, magma grouting materials;

Cement products: self-stressed, prestressed and steel-sheathed prestressed concrete water pipes, floor slabs, columns, beams, waterproof roof panels, etc.; non-shrinkage pouring between the anchor screws of mechanical equipment, machine bases and concrete foundations;

Lining protective mortar for cast iron pipes and steel pipes;

Self-waterproof rigid roof, mortar anti-seepage layer, mortar moisture-proof layer, etc.; stadium stands, urban sculptures, museums, hotels, etc.;

Instructions

When using the expansion agent, the recommended dosage is 8% of the cementitious material. ～12%，When preparing post-poured joint and post-poured reinforced belt concrete, the dosage needs to be appropriately increased.

Concrete prepared with expansion agents can adopt structural self-waterproofing technology, which integrates the building structure and waterproofing functions, eliminates external waterproofing, and makes the building structure simpler.

Concrete prepared using expansion agents can adopt ultra-long reinforced concrete seamless design and construction technology to reduce construction procedures, make construction simpler, and greatly shorten the construction period. No post-pouring joints are left, and concrete is poured continuously over a large area. It can also be used for the treatment of ordinary concrete post-pouring joints.

Precautions

The ready-mixed construction site or mixing station must add materials according to the determined shrinkage-compensating concrete mix ratio. The metering device must be accurate. The expansion agent cannot be added less, otherwise it will not meet the requirements for shrinkage compensation. However, it cannot be over-added, otherwise it will damage the concrete structure. produce destructive effects.

The mixing time of concrete mixed with expansion agent is 30 seconds longer than that of ordinary concrete, and the temperature of the concrete when it is discharged should be lower than 30 ℃，When pouring, the free fall distance of concrete should be controlled within 2 meters, and the vibration should be uniform and dense, with no vibration leakage, no under-vibration, and no vibration.

Before final setting of concrete mixed with expansion agent, attention should be paid to secondary plastering to prevent the appearance of surface settlement cracks.

The curing of concrete mixed with expansion agent after pouring is very important. Timely watering and curing should be carried out according to the temperature to keep the exposed surface of the concrete moist at all times. The curing period should not be less than 7 days. During negative temperature construction, the temperature of the concrete entering the mold must be greater than 5 ℃，Immediately after pouring, use plastic film and insulation materials for thermal insulation, moisturizing and curing;

After the concrete mixed with expansion agent is poured, the basement should be backfilled with lime soil as soon as possible, and the roof should be waterproofed and insulated as soon as possible.

Statement: The applicable scope, usage and suggestions of Furman Group products are based on the company's latest technology and experience. They are based on normal conditions and appropriate storage, handling and appropriate use. Due to the actual application of raw materials , mix proportions and usage conditions are different. Therefore, the conditions stated in this product brochure, written suggestions and other advice do not guarantee product performance and applicability to special circumstances, and do not assume legal liability. The rights of third parties must be respected. Users are advised to pay attention to the company's latest product manuals.