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.
