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MC-EINPRESSHILFE - EH

Expansive Plasticized Grouting Admixture

MC-Einpresshilfe EH is an admixture in powder form for grouting ducts in post tensioned or pre-stressed concrete structures using cementitious grout. It ensures permanent contact and an excellent bond with the grouted surfaces. The expanding properties decrease the natural settlement of the fines before the starting of initial set and reduces shrinkage of the grout so that a good workability and a proper grouting operation is achieved. Within 3 days after grouting a high frost- resistance is obtained which fulfills the regulations for grouting pre-stressed structures. The plasticizing effect helps the grout to attain a good workability and thus a proper grouting operation is achieved.

Before admixing MC-Einpresshilfe EH the cement grout powder component should be thoroughly mixed with water for about 2 to 3 minutes. After that MC-Einpresshilfe EH should be added to the mix at a ratio of 0.5 to 1% by cement weight.  The whole mixing to ensure complete dispersion, should last at least 4 minutes. Due to high dispersion of MC-Einpresshilfe EH it is possible to reduce the w/c ratio in order to get a denser mix. A preliminary test is necessary to determine optimum dosage. The grouting operation can be carried out easily and effectively into very narrow cross-section without increasing the water content of the mix.

MC-Bauchemie (India) Pvt. Ltd. Manufactures this product alongwith a host of other Construction Chemicals in technical and financial collaboration with MC-Bauchemie, Germany. MC-Bauchemie (India) Pvt. Ltd. isan ISO 9001:2008 certified Company.

MC-Torkrethilfe BE / Centrament Rapid 640

Chloride Free Guniting Aid / Alkali free Shotcrete Accelerator

MC-Torkrethilfe BE is a chloride free guniting aid in a powder form specifically developed and designed to meet the demand for efficient and multifold properties desired at guniting job sites. MC-Torkrethilfe BE is suitable as an admixture for all sprayed concrete and shotcreting operations. MC-Torkrethilfe BE accelerates the rate of hardening and development of strength. By virtue of its formulation, it waterproofs the mix and renders the sprayed mortars substantially impermeable in addition to plasticizing the mix. MC-Torkrethilfe BE is formulated with carefully selected raw materials in view of making it suitable for use in most of mortar and concrete mixes, in which the use of calcium chloride or similar substances is undesirable.

MC-TorkrethilfeBE accelerates the rate of setting by plasticizing property thereby making the concrete and mortar rode hard enough minutes after spraying.  It will seal the water seepages from the ground water in tunnels, galleries, drifts and shafts. It provides high early and final strength, allows overhead guniting aid, provides improved bonding properties, can be used at lower temperatures, allows spraying on moist surfaces; allows thicker layer in single operation and reduces material losses caused by rebound.  It has been approved officially (PA VII-5/114 BE) as chloride free guniting aid.

Centrament Rapid 640 is a liquid, alkali-free setting accelerator for shotcrete applied by dry- or wet-spraying. The dosage depends on the concrete- and ambient temperatures, as well as on the desired curing-behaviour and the reactivity of the used cement. Overdosing can lead to delayed curing and reduced early and final strengths.

Product Properties & Areas of Application of Centrament Rapid 640

• Causes fast setting

• Little reduction of the final strength

• Accelerates the work-process by allowing a layer-thickness of 15 to 20 cm per work-step

• Reduces dust-formation

• Possible acceleration of concrete with a higher consistency

• Shotcrete applied by dry- or wet-spraying

• Stabilization in tunnel construction and mining

• Temporary rockface-stabilizations

• Hillside stabilizations

MC-Bauchemie (India) Pvt. Ltd. Manufactures this product alongwith a host of other Construction Chemicals in technical and financial collaboration with MC-Bauchemie, Germany. MC-Bauchemie (India) Pvt. Ltd. isan ISO 9001:2008 certified Company

CENTRILIT NC

Concrete Additive Based on Pozzolanic Alumosilicate

Centrilit NC (nano-crystallizer) is a pozzolanic concrete additive based on amorphous alumosilicate. It concerns a synthetically manufactured material, not an industrial by-product. Apart from a high uniformity a long-term availability is also ensured.

New generation Materials like Centrilit NC based on special nano-crystallizers have been recently developed. These new materials improve the properties that are crucial for the durability of high-performance concrete. In addition to reducing chloride migration, an exceptional chemical and acid resistance of the high-performance concrete can be achieved with Centrilit NC. The concrete structure is simultaneously reinforced right down to Nano scale, density is improved and compressive and flexural strength as well as abrasion resistance of the high-performance concrete is increased.

The unique properties of Centrilit NC can be utilised in all areas of ready-made and pre-cast concrete production that need high durability, e.g.: pre-cast concrete, HPC in the energy, wastewater and chemical industry. Due to high homogeneity and reduced tackiness compared with microsilica-based concrete, workability is improved significantly. In many instances this even enables the production of high-performance concrete that can be pumped. A distinct improvement of the building structure’s aesthetics is gained due to the fair appearance of the concrete surface. Centrilit NC performs over the some of the disadvantages of Other Superfine Pozzolans:

1. Graded for dispersion in concrete
2. Graded particle size
3. Optimizes mixing time within concrete
4. Good dispersion reduces unreacted material in the mix and increases passivation by C-S-H gel on aggregate surface
5. Reduces risk of Alkali Silica Reaction by Agglomeration of aluminosilicate particles
   

General Advantages of using Centrilit NC in Concrete

• Increased compressive and flexural strengths
• Reduced permeability (including chloride permeability), Increased resistance to chemical attack and hence Increased durability
• Reduced potential for efflorescence, which occurs when calcium is transported by water to the surface where it combines with carbon dioxide from the atmosphere to make calcium carbonate, which precipitates on the surface as a white residue.
• Reduced effects of alkali-silica reactivity (ASR)
• Enhanced workability, Better pumpabilty and finishing of concrete
• Reduced shrinkage in concrete, due to "particle packing" making concrete denser
• Improved color by lightening the color of concrete making it possible to tint lighter integral color.
• Endless quantities as it is a Factory made Homogenous product
• Reduced dosage of superplasticizer

MC-Bauchemie (India) Pvt. Ltd. Manufactures this product alongwith a host of other Construction Chemicals in technical and financial collaboration with MC-Bauchemie, Germany. MC-Bauchemie (India) Pvt. Ltd. isan ISO 9001:2008 certified Company.