Non-shrink Grouting Material Support
Overview
Non-shrink Grouting Material Support is a high-performance construction material designed to fill voids and anchor heavy equipment or structural elements without volume reduction. It combines Portland cement, fine aggregates, and chemical admixtures to achieve controlled expansion during hydration. Widely used in industrial and civil engineering, it eliminates the risk of gaps caused by conventional grout shrinkage, ensuring full contact with substrates. Unlike traditional mortar, this material maintains dimensional stability under load cycles and environmental exposure. It meets international standards such as ASTM C1107 and EN 1504-6, making it suitable for precision applications like turbine installations, steel column bases, and seismic retrofitting projects.
Structure and Working Principle
The material's effectiveness stems from its optimized particle grading and expansive additives. Silica fume fills microvoids, while calcium sulfoaluminate-based agents generate controlled crystalline growth during curing, counteracting shrinkage forces. This creates a dense, monolithic structure with minimal porosity. When mixed with water, the slurry achieves self-leveling consistency (flow values of 250-350mm) to penetrate tight spaces. The hydration reaction produces ettringite crystals that exert outward pressure, compensating for plastic and drying shrinkage. Post-curing, the hardened grout exhibits bond strength exceeding 1.5 MPa to concrete and steel, along with fatigue resistance for dynamic loads.
Key Features
Zero shrinkage is the defining characteristic, ensured by expansion rates of 0.02-0.1% as per ASTM C827. Compressive strength develops rapidly, reaching 30 MPa within 24 hours and exceeding 50 MPa at 28 days. The material also demonstrates low permeability (≤10-12 m/s) to prevent chemical ingress. Additional advantages include non-bleeding formulation, chloride-free composition for reinforced concrete, and thermal compatibility with common substrates. Some advanced variants incorporate polymer modifiers for enhanced flexibility or corrosion inhibitors for coastal environments. These properties collectively extend service life while reducing maintenance needs.
Application Areas
Primary applications include heavy industrial machinery foundations (e.g., turbines, presses), where it transfers operational loads evenly to concrete bases. In transportation infrastructure, it secures bridge bearings and rail track slabs, accommodating thermal movement without cracking. The material is equally vital for precast construction, filling sleeve connections in modular buildings and tunnel segments. Energy sectors use it for wind turbine anchor bolts and nuclear containment structures. Specialized formulations serve offshore platforms and mining equipment, withstanding vibration and impact loads.
Maintenance and Precautions
Proper installation begins with substrate cleaning (SSPC-SP3/NACE No. 3 standard) and pre-wetting to prevent moisture absorption. Mixing must follow manufacturer ratios (commonly 12-14% water by weight) using paddle mixers to avoid entrapped air. Ambient temperatures should remain between 5-35°C during application. Curing requires moist conditions for 24-48 hours, achievable with wet burlap or membrane-forming compounds. Post-installation inspections should verify full contact using ultrasonic testing or impact-echo methods. Avoid traffic loads until reaching minimum strength (typically 20 MPa). Long-term maintenance involves annual visual checks for edge spalling or chemical attack.
B2B Procurement Guide
Industrial buyers should specify performance requirements: compressive strength class (C40-C80), expansion rate, flow diameter, and chloride content (≤0.1% by cement mass). Bulk orders (10+ tons) often qualify for 5-15% discounts, with lead times of 7-14 days for customized blends. Reputable suppliers provide third-party test reports (e.g., SGS, TÜV) and batch-specific certificates of analysis. Packaging options include 25kg moisture-resistant bags or 1-ton bulk bags with palletization. For critical projects, request on-site technical support for mixing and placement supervision. Regional availability varies—coastal areas may prefer sulfate-resistant formulations.
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