Cebex EN
Expanding Non-Shrink Admixture for Prestressed Concrete Tendon Duct Grouting
Authorized Project Distributor — Fosroc India | Space Arc Engineering, Ghaziabad
Product Overview
Cebex EN is a specialised expanding admixture for the production of non-shrink, non-bleed, high-fluidity grout for injecting prestressing tendon ducts in post-tensioned concrete structures. Protecting the prestressing tendons from corrosion is one of the most critical durability requirements in post-tensioned bridge and building construction — any void in the tendon duct grout exposes the high-strength steel tendon to oxygen, moisture, and potentially chloride ions, leading to stress corrosion cracking and catastrophic structural failure. Cebex EN is specifically designed for this critical application, controlling bleeding to near zero, providing sufficient expansion to compensate for the slight drying shrinkage of the grout over time, and maintaining the high fluidity required for the grout to be pumped the full length of long tendon ducts without the pump pressure becoming excessive. Cebex EN-modified grout conforms to the requirements of post-tensioning specialist specifications and bridge owner standards for tendon duct grouting. Unlike general non-shrink admixtures (such as Cebex 100), Cebex EN is specifically calibrated for the very low water-cement ratio (typically 0.40 to 0.44) grout used in tendon ducts. Space Arc Engineering distributes Cebex EN for post-tensioned bridge, viaduct, and high-rise building projects across Delhi NCR and Northern India.
Applications
- Prestressing tendon duct grouting in post-tensioned concrete bridges
- Post-tensioned building and slab tendon duct protection grouting
- Vertical and inclined duct grouting in pylons and towers
- Re-grouting of voided ducts in existing post-tensioned structures
- Cable stay and extradosed bridge tendon protection grouting
- Any post-tensioning application requiring non-shrink, non-bleed duct grout
Key Advantages
- Zero bleed — no water separation that would leave voids in the duct
- Non-shrink expansion compensates for drying shrinkage over time
- High fluidity maintained for pumping full length of long ducts
- Meets international post-tensioning specifications for duct grouting
- Protects high-strength steel tendons from corrosion for the life of the structure
- Specifically calibrated for low water-cement ratio tendon duct grout
Technical Data
| Type | Expanding non-bleed admixture for tendon duct grouting |
| Bleed | Zero (at specified w/c ratio) |
| Expansion | Slight (to compensate shrinkage) |
| w/c Ratio of Grout | 0.40–0.44 (typical) |
| Chloride Content | Nil (non-corrosive) |
| Application | Injected into prestressing tendon duct by pump |
Get a Quote
📞 +91 9999155255
📧 info@space-arc.com
🏢 Space Arc Engineering, Sahibabad, Ghaziabad
Frequently Asked Questions
Why is it so critical to have zero bleed in tendon duct grout?
In a prestressed concrete tendon duct, any water that bleeds from the grout accumulates at the high points of the duct profile. When the water evaporates or is absorbed, it leaves voids at the high points. These voids expose the high-strength steel tendons to oxygen and moisture — conditions that can lead to corrosion, hydrogen embrittlement, and eventually stress corrosion cracking of the tendon. Failure of a tendon can cause catastrophic structural collapse. Zero bleed is therefore not a nice-to-have but an absolute requirement for tendon duct grouting.
What equipment is used to inject Cebex EN grout into tendon ducts?
Tendon duct grouting requires a purpose-designed grout pump with adequate pressure capacity (typically 10 to 20 bar), a mixer capable of high-shear mixing at the low water-cement ratio required, and calibrated injection and venting equipment attached to the duct inlets and outlets. The grouting operation must proceed from the lowest inlet port to the highest outlet vent, with grout flowing upward to displace air and avoid trapped air pockets. Specialist post-tensioning grouting contractors with appropriate equipment should carry out this work.
What water-cement ratio should be used for Cebex EN grout?
The recommended water-cement ratio for Cebex EN tendon duct grout is typically 0.40 to 0.44 by weight. Below 0.40, the grout becomes too thick to pump easily over long duct lengths. Above 0.44, there is increasing risk of water separation (bleeding) and reduced protection of the tendon. The exact water-cement ratio should be determined by trial mixes using the specific cement and Cebex EN batch to confirm zero bleed and adequate fluidity at the intended pumping distance.
Source Cebex EN for Your Project
Space Arc Engineering is an Authorized Project Distributor for Fosroc India serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
Get Cebex EN — Expanding Non-Shrink Admixture for Prestressed Concrete Tendon Duct Grouting — pricing, TDS & technical help
Space Arc Engineering is an authorized Fosroc distributor & applicator in Delhi NCR & pan-India. Fast quotes, datasheets and on-site support.
Get a Quote on WhatsAppRequest TDS on WhatsApp