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What are the main differences between mechanical anchors and chemical anchors?

Update:11-06-2020
Summary:

Both mechanical anchors and chemical anchors are widely […]


Both mechanical anchors and chemical anchors are widely used concrete anchoring materials. There has been controversy in the
industry regarding the difference between the two and how to choose.
Due to different materials used and different reinforcement principles, mechanical anchors and chemical anchors are quite
different:   
1. High and low temperature resistance and weldability
Chemical anchors use chemical adhesives, which have a relatively low melting point and are not weldable; mechanical anchors use
metal materials and have high temperature resistance, so they are weldable, so they are more flexible. Similarly, mechanical
anchors made of metal are more resistant to low temperatures than chemical adhesives.  
2. Tightening stability
The metal material used for mechanical anchors has relatively stable performance and helps to maintain the fastening force for
a long time; the stability of the performance of chemical anchors depends largely on the performance of chemical adhesives.
Therefore, it is important to choose a good chemical adhesive.
3. In terms of seismic performance  
The screw material of chemical anchor bolts has low strength and low tensile and shear resistance, so the seismic resistance
level is low, basically below grade 7, and the screw material of mechanical anchor bolts has high strength and strong The
anti-stretching ability, so the anti-seismic ability is strong, which can reach the level 8 level.
4. Construction cycle  
Chemical anchors are fastened with chemical adhesives, which require a certain curing time, especially in the low temperature
environment in winter, the curing time is slightly longer, so the construction period is longer; the mechanical anchors are
ready to use, no need to wait, and during construction It has nothing to do with the temperature environment, so the
construction period is shorter.

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