There are four generic types of joint sealant with high performance. Their properties are highlighted in the following table:
| Acrylic | Polysulfide | Polyurethane | Silicone |
| Accommodate 12% movement. | Poor recovery
in high cyclic movements |
Accommodate
50% movement. |
Accommodate
50% movement. |
| Exhibit shrinkage upon curing | Exhibit excellent
chemical resistance |
Excellent bonding, can
be used without primer |
Excellent low temperature
movement capability |
| Solvent-based. | Good performance in submerged conditions. | Good UV
resistance |
Excellent UV and heat stability |
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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
If you have a query, you can ask a question here.
in expansion joint application which is polysulfide or polyuerthane good longlostin to the expansion joint work
expansion joint application is somewhat a big subject to discuss and hence very difficult to comment on which product chemistry is best suitable. with the ongoing research and product modification polyurethane seems to have upper edge compare to polysulphide or silicone based chemistry.
the reason for the same is good mechinical, abression and adhesion properties.
and interms of application and surface preparation, here again polyurethane scores better over other chemistries.
many of us get confused with the term expantion joint, i strongly suggest what type of building joint you mean… like isolation joints, connecting joints, horizontal and vertical joints, pavement joints etc…based on the type of joint, substrate and conditions different type of sealant chemistry offer there usp.
hope i managed to answer your point to some extent
Which sealant to be used for existing terrace concrete slab roof small crack gaps( cracks in screed) ?
Which water proofing chemical to used on the roof ?