Description
Qiandao QD-85 / QD-100 Ultra-High-Strength Rebar Sleeve Grouting Materials
Qiandao QD-85 and QD-100 are ultra-high-strength, non-shrink cement-based grouts specifically designed for rebar sleeve connections in prefabricated building construction, delivering exceptional early strength, superior bond performance, and reliable structural integrity.
Product Overview
Qiandao QD-85 and QD-100 are premium high-performance grouting materials engineered for rebar sleeve connections in prefabricated and assembled building structures. These grouts feature high fluidity and excellent plasticity retention, providing outstanding construction performance that allows complete filling of any complex gap with ease and convenience.
Both products deliver early-strength and ultra-high-strength performance, ensuring continuous strength growth over time. The ultra-high-strength anchoring ensures the safety and reliability of rebar connections, while the high early strength significantly shortens the load-bearing period of components and reduces overall construction cycles. The slurry exhibits slight expansion with no shrinkage over long-term use, and the solid expansion base material effectively controls the material’s shrinkage while significantly increasing its grip on the rebar. With high bond strength between the slurry, rebar, and sleeve, these grouts effectively transfer various stresses and ensure a strong, durable connection.
Key Features & Benefits
- Ultra-High Early Strength: QD-85 achieves ≥35 MPa in 1 day and ≥85 MPa in 28 days; QD-100 achieves ≥40 MPa in 1 day and ≥100 MPa in 28 days, enabling rapid load transfer and accelerated construction schedules.
- Exceptional Flowability: Initial fluidity ≥300mm ensures excellent penetration into narrow sleeve gaps and complex connection cavities, guaranteeing complete void-free filling.
- Non-Shrink & Micro-Expansion: Vertical expansion rate of 0.02-2% at 3 hours and extremely low 28-day self-drying shrinkage (≤0.045%) ensures long-term volume stability and tight bonding with rebar and sleeves.
- Superior Bond Strength: High bond strength with both rebar and sleeve effectively transfers tensile, compressive, and shear stresses, ensuring structural integrity of assembled connections.
- Zero Bleeding: Maintains a completely homogeneous mix to prevent segregation and ensure uniform performance throughout the connection.
- Excellent Durability: Ultra-low chloride ion content (≤0.03%) provides superior corrosion protection for embedded rebar, extending the service life of the structure.
Technical Specifications
Note: Performance indicators based on standard testing conditions.
| Test Items | QD-85 | QD-100 | |
|---|---|---|---|
| Fluidity (mm) | Initial | ≥ 300 | |
| 30 min | ≥ 260 | ||
| Compressive Strength (MPa) | 1 day | ≥ 35 | ≥ 40 |
| 3 days | ≥ 60 | ≥ 70 | |
| 28 days | ≥ 85 | ≥ 100 | |
| Vertical Expansion Rate (%) | 3 hours | 0.02 – 2.0 | |
| 24h – 3h | 0.02 – 0.4 | ||
| 28-Day Self-Drying Shrinkage (%) | ≤ 0.045 | ||
| Chloride Ion Content (%) | ≤ 0.03 | ||
| Water Bleeding Rate (%) | 0 | ||
Applications
Qiandao QD-85 and QD-100 are specifically engineered for critical connection applications in prefabricated and assembled building construction, primarily used for:
- Grouting into rebar splicing sleeves after hoisting and assembly of prefabricated building components.
- Anchoring connections between rebar and grouting sleeves in assembled concrete structures.
- Dense filling of connection gaps between prefabricated components.
- Rebar connections in precast concrete columns, beams, shear walls, and other structural elements.
- Post-tensioning and coupler connections requiring ultra-high-strength grout.
Frequently Asked Questions (FAQ)
1. What is the difference between QD-85 and QD-100?
The primary difference is in compressive strength. QD-85 achieves ≥85 MPa at 28 days, while QD-100 achieves ≥100 MPa at 28 days. Both offer excellent fluidity and non-shrink properties. QD-100 is recommended for higher-load structural applications requiring superior strength performance.
2. What is the recommended mixing procedure for QD-85/QD-100?
The grout should be mixed with clean water using a high-shear colloidal mixer or mechanical stirrer until a uniform, lump-free, highly fluid consistency is achieved. Always follow the specified water-to-powder ratio provided in the technical data sheet to ensure optimal performance and strength development.
3. What is the pot life of the mixed grout?
The grout is designed to maintain excellent fluidity for at least 30 minutes (≥260mm) to allow sufficient time for placement into sleeves and connection gaps. The exact pot life may vary based on ambient temperature and should be verified on-site.
4. How does the grout ensure reliable rebar connection?
The micro-expansion and non-shrink properties ensure tight contact with both the rebar and sleeve wall. The high bond strength, combined with zero bleeding and extremely low chloride content, provides superior load transfer capability and long-term corrosion protection, ensuring structural safety and reliability.
5. Is this product suitable for all types of grouting sleeves?
Yes. QD-85 and QD-100 are compatible with standard rebar grouting sleeves used in prefabricated building construction. Their high fluidity ensures complete filling of both full-grout and half-grout sleeve systems.
