Description of EM-Silica (MicroSilica)- Grade - 85D (T.D.S)
EM-SILICA (MICROSILICA) GRADE-85D is a fine powder which has great Pozzolanic properties. is a by-product material which consists of non-crystalline silicon dioxide with high specific surface area and high pozzolanic reactivity. It is used in concrete mixes o replace part of the cement and enhance the resultant concrete’s water impermeability and/or increase concrete strength. Use of our product could help to achieve higher compressive strength and decrease of permeability due to reduced porosity, reduced calcium hydroxide content and reduced width of the interfacial zone in the aggregate. The development of more CS-H gel in concrete with our product may progress the concrete properties.
Workability of EM-Silica (MicroSilica)- Grade - 85D (T.D.S): -
Water demand and workability of the concrete are significantly influenced by particle-size-distribution present in the solid system. Typical concrete mixtures do not have an optimum particle size distribution, and this accounts for the undesirably high-water requirement to achieve certain workability. To plasticize a cement paste for achieving an acceptable consistency much larger amounts of water than necessary for the hydration of cement. However, there is the possibility of water reduction higher than 20% in case of the use of our Micro Silica. This is because fine particles of our Micro Silica get absorbed on the oppositely charged surfaces of cement particles and prevent them from flocculation. The cement particles are thus effectively dispersed and will trap large amounts of water meaning that the system will have a reduced water requirement to achieve a given consistency. The more the fineness the more is the number of contacts among the particles and hence the more is the resistance to flow.
Water absorption:-
One of the main sources of contamination of concrete in structures is water absorption which influences durability of the concrete and also has the risk of alkali aggregate reactions. The more impermeable the concrete, the greater will be its resistance to deterioration. The use of our product in the composites could cause an extensive pore refinement in the matrix and in the interface layer, thereby decreasing water permeability. The permeability will decrease rapidly with the progress of the hydration, our product more effectively blocks the pores helping to reduce permeability.
Durability properties of concrete containing our Micro Silica :-
Alkali-silica reaction: -
Our Micro Silica is used to prevent or minimize cracking in concrete due to the expansive gel formed by the
alkali—silica reaction.
Chloride-ion diffusion: -
It is approved that the long term deterioration of concrete and corrosion of reinforcing steel commonly occurs by entrancing the chloride ions into body of concrete structures. It is also well known that the rate of chloride ion diffusion into concrete is related to the permeability and pore size distribution. The ability of our Micro Silica mixtures to reduce the potential detrimental effects of chloride intrusion into concrete. There are significant reductions in chloride ions permeability due to use of our product. Consequently, they concluded that concrete containing our Micro Silica may require less depth of cover to protect the reinforcing steel. Concrete mix with our product will effectively reduce the pore sizes, permeability, and diffusivity of chloride ions in concrete.
Sulphate resistance: -
Concrete mixed with our Micro Silica has good resistance to sulphate attack
