15 November 2019

Spotlight-MC-Bauchemie

Concrete solutions

 

CENTRILIT NC- Concrete Additive Based on Pozzolanic Alumosilicate

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:
Graded for dispersion in concrete 

  • Graded particle size
  • Optimizes mixing time within concrete
  • Good dispersion reduces unreacted material in the mix and increases passivation by C-S-H gel on aggregate surface
  • 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 pumpability 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
  • Endless quantities as it is a factory made homogenous product
  • Reduced dosage of superplasticizer

 

EMCORIL AC- Acrylic Based, Membrane Forming Curing Compound

One constraint in civil construction is the curing of concrete once it has been cast and the formwork is removed. Curing done by conventional methods cannot be ensured to its optimum efficiency when it is done with water. The strength and durability of concrete does not only depend upon the correct composition and placing of concrete but also on correct curing.

The principle of curing is to prevent the evaporation of the capillary water in the concrete so that sufficient water is available for complete hydration. This leads to better end hydration products and avoids surface dusting and plastic shrinkage. The conventional methods of curing like water spraying, covering with wet burlaps, polyethylene sheets etc, are not only time consuming but also start after the initial evaporation of water and after the appearance of the first cracks. Ideally curing should begin as soon as possible after the casting of concrete.

Emcoril AC is an acrylic emulsion based membrane forming curing compound, to be brushed or sprayed on the fresh concrete only once, at initial stage which is the critical hardening period of concrete or mortar. It forms a seamless film on the surface of the fresh cast concrete and mortars, which arrests the evaporation of water from the capillaries and prevents quick drying of the concrete, thus avoiding the cracks and enabling the concrete to hydrate efficiently.

Emcoril AC should be applied as soon as possible after disappearance of water sheen from the surface. If the concrete is dry, it is recommended to fog down the surface before application of Emcoril AC. Emcoril AC can be applied by brush or by normal knapsack sprayers having suitable nozzle. In case of larger areas motorized continuous spraying devices can be used. The nozzle of the spraying device should be held about 0.7 to 1.0 m distance from the surface and it should be ensured that the complete area is covered. The pump pressure must be maintained throughout the operation to obtain a fine spray.

 

ADVANTAGES OF EMCORIL-AC

  • Emcoril AC protects green concrete against burning by acute sunrays
  • Particularly suitable, where early plastering is required
  • Optimum hydration leading to stronger end hydration products 
  • Does not affect normal setting process of cement
  • Minimises and heals shrinkage / microcracks at early stages of concrete setting
  • Ideal for overhead curing, inaccessible places & places having water shortages
  • Better solar reflectance lowering the concrete temperature
  • No need for removal before application of subsequent surface treatments

 

CONSUMPTION: Approx 200 - 250 g/m²  

 

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

 




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