Its core feature is high density,with internal pores effectively filled and blocked,creating a microstructure resistant to water passage.Incorporating waterproofing or expansive agents further reduces shrinkage cracking or generates micro-expansive pressure to compensate for shrinkage,enhancing overall impermeability.Some products offer limited self-healing capabilities to autonomously seal micro-cracks.
The impermeability grade is its primary specification,from P6(withstanding 0.6MPa water pressure)to P12(1.2MPa)and beyond.Mix design typically involves a low water-to-binder ratio,adequate cement content,and optimal sand ratio.Well-graded aggregates are crucial for a dense skeleton.Can be combined with freeze-thaw(F)or sulfate resistance properties as needed.
Widely used in underground works:basement walls,base slabs,roof slabs;tunnel linings;civil air defense shelters.Used in hydraulic structures:water tanks,water towers,swimming pools,wastewater treatment plants.Also used for roof waterproofing layers,bathroom floor screeds,etc.Requires uniform vibration for compaction and strict early-stage moist curing to prevent cracking.
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