How to choose the best hollow anchor bar for corrosion protection?
by Una S. Website Marketing SpecialistIn engineering
applications, the biggest influence on the service life of self-drilling hollow
anchor bolts is the stratum environment. Especially when it is used in the sea
area or close to the coastline, where the environment is more aggressive.
Therefore, you should select hollow anchor rods for corrosion protection in
aggressive environments. Next, I will introduce how to choose the best suitable
anti-corrosion anchor bar in different application environments.
1.
Non-aggressive Environment
For non-aggressive
environments, the cement grout can also protect the anchor bar body from
corrosion. Research shows that different stratum or application structures have
corresponding requirements on the grout thickness if they want to achieve
corrosion resistance. For example, when used as a compressive pile, the grout
thickness should be at least 20mm; when used in soil, the thickness should be
at least 20mm; when used as a tensile pile the
thickness should be at least 30mm. Be sure, this is only the minimum value. At
the same time, it should be noted that the crack width should not be too large,
otherwise it will greatly affect the anti-corrosion performance.
2. Aggressive
Environment
The aggressive
environment is complex and diverse, Sinorock provides a variety of anti-corrosion
anchors to meet the different needs of customers.
3. Stainless
steel hollow anchor bolt
Stainless steel
hollow anchor bolt is made of stainless steel, with better anti-corrosion
performance, and it can resist the corrosion of air and chemical media. In
addition to the conventional construction characteristics of self-drilling
hollow anchor rods, stainless steel anchor rods also have excellent
weldability, high strength, and wear resistance.
4. Hot-dip
galvanizing anchor bolt
Galvanizing is a
special precaution that can be provided to protect the hollow anchor bar
against corrosion. Zinc coating applied to the steel withstands severe
corrosion and represents a durable, economic form of corrosion protection.
Sinorock's hot-dip galvanizing bolts meet the ISO 1461 and can be used for more
than 50 years in most environments. Hot-dip galvanizing anchor bolt is
especially suitable for various acid, alkali mist, and other corrosive
environments, as well as occasions with longer service life requirements and
complex environments in geotechnical engineering.
5. Epoxy coating
anchor bolt
The epoxy resin
is sprayed on the bolt surface by electrostatic spraying. Sinorock epoxy
coating products are mainly based on EN 13438, and the service life is not less
than 30 years. An epoxy coating anchor bolt is suitable for occasions where
stratum and groundwater contain sulfides and chlorides, corroded by seawater,
and environments with stray currents or corrosive medium.
6. Duplex
coating anchor bolt
The duplex coating is a combination of hot-dip galvanizing and epoxy coating. Firstly, the product is hot-dip galvanized, and then the epoxy powder is sprayed on the surface. The anchor bolt has better anti-corrosion performance and longer service life after two kinds of anti-corrosion processes. It can not only resist ordinary chemical corrosion but also work in acidic environments and electrochemical corrosion with stray currents. A duplex coating anchor bolt is generally used in the permanent support of hydro-projects, underwater tunnels, subway tunnels, and some important buildings affected by groundwater for a long time. And it is also widely used in harbors, wharves, offshore buildings which are corroded by seawater. In most environments, the service life of duplex coating anchor bolt can reach 100 years without maintenance.
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Created on Dec 13th 2021 02:50. Viewed 126 times.