Systems
MultiGrout® System
A cementitious-based injection grouting system for ground strengthening and control of water inflows in underground construction.
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Overview
The MultiGrout® System is a high performance cementitious-based injection grouting system for ground strengthening and control of water inflows in underground construction.
It was developed during the last 10 years in close co-operation with industry, predominantly in Norway, and is marketed and supported technically worldwide.
What makes MultiGrout different?
The MultiGrout System varies in many ways from traditional ordinary Portland cement or microfine Portland cement grouts in common use.
From an application perspective
- Predictable and achievable results in very low water inflow specifications.
- Efficiency: results achieved consistently in a single grouting round.
- Minimisation of waste (time and materials).
- Ability to control grout flow / set time without detriment to penetration.
- Long-term durability.
- Environmentally inert and safe to use.
- Flexibility: one grouting system, no special equipment.
- Proven success over a wide range of conditions.
From a materials perspective
- Choice of OPC, microfine or ultrafine Portland cement grout, determined at the outset by the outcomes required.
- Fluid-stable grouts at any water/cement ratio (less than 2% bleed).
- Volume-stable grouts at any water/cement ratio (no volume loss from fluid to solid state).
- High resistance to pressure filtration (grouting up to 100 bar).
- Set-controlled “Blocker” grout: the troubleshooting tool.
System material components
The MultiGrout System consists of four core material components and uses typical colloidal mixers and grout pumps, with no special equipment requirements.
- Portland cements: either ordinary or purpose-manufactured microfine or ultrafine cements.
- Dispersing agent: specifically selected for compatibility and to give optimum performance.
- Penetrator / stabiliser: GroutAid® (a special grade of microsilica processed into a stable aqueous slurry) to improve grout stability, penetration, strength and durability.
- Blocker: a two-component mineral-based microfine cement material with controlled set time, early strength development and an affinity with Portland cement.
Economic considerations
The overall costs of an injection grouting programme are influenced by a wide range of factors, particularly rock mass conditions, whether works are pre- or post-grouting, and the outcome required. These are site specific and should not be generalised.
- Cost of materials makes up only 15–25% of the total cost of a grouting programme; time-related costs are stated as 75–85% of total cost.
- The MultiGrout System is developed to achieve required outcomes in one grouting round (no repeat rounds).
- Increase in grout volume per kg of cement by 50–80% when the primary grout mix uses a water/cement ratio of 1.2, because stability, penetration and strength properties can be maintained at higher water/cement ratios.
- Up to 25% improvement in grout volume: volume stability ensures plastic grout volume translates directly to solid grout volume.
- Ability to control grout placement and limit uncontrolled grout flow via set-controlled “Blocker” grout minimises waste of grout and minimises waste of valuable time.
The MultiGrout Team
The MultiGrout activities extend well beyond materials supply. These activities involve a core group of technical specialists providing four key service elements:
- Materials supply
- Application methodology
- Education / on-the-job training
- Engineering / design support
Disclaimer
The information given on this data sheet is based on many years of research and field experience and is accurate to the best knowledge of Multigrout personnel. However, due to the numerous factors that can affect the performance of injection grouts, with or without our products, Multigrout offers this information without guarantee and accepts no liability for any direct or indirect damages from its use.
If further information or assistance is required, please contact your local specialist representative or the office number given on this datasheet.
Trademarks
MultiGrout®, GroutAid® and Elkem Microsilica® are registered trademarks and belong to Elkem ASA Materials.
Documents
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