ADVANTAGES OF NS

ADVANTAGES OF NS:

·         Cessation of contamination caused by micro silica solid particles.

·         Lower cost per building site.

·         Concrete with high initial and final compressive and tensile strengths.

·         Concrete with good workability.

·         Cessation of super plasticizing   utilization.

·         Cessation of silicosis risk.

·         High impermeability.

·         Partial replacement of cement by Nanosilica.

·          During the moisturizing reaction of the cement, the silica produces CSH particles,    the “glue” of the concrete ensuring the cohesion of all the particles.

·         Concrete with nS has a specific  area to1000m²/gr (micro silica has only 20m²/gr) and a particle size of 5nm to 250 nm

           As a consequence of its size, concrete produces nano crystals of CSH, filling up all the micro pores and micro spaces which were left empty in traditional concrete production.
 

Concrete allows saving in between 35% and 50% of the used cement. We do stress that we recommend changing the formula of the concrete in order to take advantage of the characteristics of the concrete Nano silica particle.

CONSIDERABLE FEATURES OF NANO SILICA:

 When compared to relative materials that are used as additives in concrete like micro silica or silica fumes nS exhibits enhanced properties.

For instance

·         nS is of low cost when compared to micro silica

•  It is having greater mechanical properties like compressive and split strength
• Greater water absorption, workability and also durability when compared to micro silica.
• It is eco-friendly mainly because of its physical state.

·         Moreover it is operator friendly.

·         Consumption of cement can be reduced as nS acts as puzzolanic material.

·         On the whole, cost of construction can be reduced and it is standing by economic side.

PRODUCTION METHODS OF NANOSILICA:

There are different methods to produce nS products.

(1) One production method is based on a sol-gel process (organic or water route) at room temperature.

(2) Another production method is based on vaporization of silica.  

(3) Estevezetal biological method .

(4)  precipitation method.  

(5) Finally, nano-silica (ns) is being developed via an alternative production route.   This is one of the most feasible method highly for industrial purpose.

The olivine silica process will be described, using sulphuric acid as an example. In the first section the acid is neutralized at elevated temperatures with ground forsteritic olivine rock. Secured Loan Calculator
 

The reaction goes to completion (pH 9-10) even at room temperature but for an industrial application, the reaction rate has to be increased, e.g. by increasing the temperature or the surface area of the olivine. The neutralization yields a mixture of a magnesium/iron salt solution, precipitated silica and unreacted olivine. In the next process the unreacted olivine and inert minerals are removed from the reaction suspension by a gravitational separation. Subsequently the precipitated silica is separated from the solution by filtration and Washing steps.  Purchase Structured Settlements.
 

CONCLUSIONS:

A new nano-silica (nS) can be produced in high quantities and for low prices that allows for a mass application in concrete. It may replace cement in the mix, which is the most costly and environmentally unfriendly component in concrete. The use of nS makes concrete financially more attractive and reduces the CO2 footprint of the produced concrete products. The nS will also increase the product properties of the concrete: the workability and the properties in hardened state, enabling the development of High performance concretes (HPC) for extreme constructions. That means that a concrete with better performance, lower costs and an improved ecological footprint can be designed. Also further research is required to modify the production methods of nS in order to avoid the formation of agglomerates such as the development of nS products in liquid state, application of surfactants, ultrasonification and microwave drying, and to achieve better dispersion of developed nS from  olivine dissolution. Mesothelioma Lawyers San Diego.