Best expansive agent for bridge decks-- Calcium-Magnesium Composite Expansive Agent (CMCE) is a cutting-edge additive designed to compensate for concrete shrinkage and prevent cracks in critical structures. making it ideal for mass concrete, waterproofing projects, and high-precision construction.
Keywords：
Concrete crack prevention additive
Calcium magnesium expansive agent
Low heat expansion admixture
Product Introduction
Calcium-magnesium composite expansion agent is based on the actual temperature and contraction course of concrete, the use of specially formulated calcium expansion components to produce early expansion to compensate for early self-shrinkage and produce pre-compressive stress under the constraint conditions, and the specific activity of magnesium expansion components to compensate for the temperature drop contraction and late contraction, to realize the concrete shrinkage inhibition in phases and in the whole process to achieve the purpose of non-shrinkage, which reduces the risk of cracking of the concrete and improves the The durability of concrete is improved.
Bridge decks & piers: Compensates for drying shrinkage in post-tensioned concrete
Tunnels: Prevents annular cracks in segmental linings
Dams: Controls thermal stress in mass pours
Basement slabs: Eliminates water seepage from shrinkage cracks
Precast elements: Maintains dimensional stability during steam curing
High-rise cores: Reduces formwork pressure vs. conventional expansive agents
Nuclear containment vessels: MgO’s delayed expansion matches radiation-induced concrete growth
Marine structures： Resists sulfate attack
Q: How does CMCE compare to shrinkage-reducing admixtures (SRA)?
A: SRAs lower surface tension but don’t actively expand. CMCE provides positive volume increase (0.025% min. per ASTM C845) for guaranteed crack closure.
Q: Can CMCE replace joint fillers in slabs-on-grade?
A: Yes! At 8% dosage, it enables jointless slabs up to 40m x 40m (per ACI 360R design).
Q: Is special curing required?
A: Standard moist curing (7d) is sufficient. No membrane curing needed.
Product Parameters
Packed in composite bag, net weight 25kg/bag, shelf life 3 months; need to be stored in a dry and ventilated room, the bag is sealed, pay attention to moisture-proof, anti-freezing.
| Test item | Indicator Requirements | |
| Type I | Type II | |
| Fineness | Specific surface area/(m2/kg) 1.18mm square hole sieve residue /% | ≥250 ≤0.5 |
| Moisture content/% | ≤1.0 | |
| Setting time(min) | Initial coagulation Final coagulation | ≥45 ≤600 |
Restriction of expansion(%) 20℃ water 7d 20℃ air 21d Δε | ≥0.035 ≥-0.010 ≥0.015 | ≥0.050 ≥0.000 ≤0.050 |
| Compressive strength(MPa) | 7d 28d | ≥22.5 ≥42.5 |
Hot Products
Silane impregnating agent-A surface applied, non-film forming protection siloxane based product which can improve the durability of concrete structure. We have four products with Isobutyltriethoxysilane, Isooctyltriethoxysilane, n-Butyltriethoxysilane, and n-Octyltriethoxysilane as the main component.
Anchoring of railway concrete sleepers with spikes, prefabricated bridge cementing joints, and anchoring of anchor bolts for mechanical equipment.
Premium carbon fiber grid fabric for concrete repair & structural reinforcement. corrosion-resistant, 5x lighter than steel mesh.
Underwater Epoxy Bonding Agent
Reinforcement and reconstruction of steel plates, carbon fiber cloth, or concrete components and masonry components with RH above 90%.
Elastic concrete is an elastic polymer material composed of component A, B, and C. Among them, components A and B are polymer elastic resin and toughening curing agent respectively, and component C is special aggregate.
Leikesitm-Copper-Plated Steel Fiber
Usage: Highway and bridge; Railway engineering; Pipeline engineering; Hydraulic dam; Port and ocean engineering
Start Enhancing Your Business With a Concrete Solution Today
Our products have undergone rigorous testing at our national testing laboratory (CABR testing center co., ltd). Renowned Fortune Global 500 firms such as China Railway Group Limited, China Communications Construction Company Limited, and Sinohydro are among our esteemed clients.
Navigation
Navigation
Contact Us
Get in Touch
Get in Touch
