Frequently Asked Questions
Technical clarifications on concrete waterproofing formulations, NESREA compliance, and application methods for infrastructure projects.
What is the mechanism of crystalline waterproofing in concrete?
Crystalline waterproofing admixtures contain reactive silicates and catalysts that combine with free calcium hydroxide and moisture in the concrete matrix. This reaction forms insoluble needle-shaped crystals that fill capillary pores and micro-cracks up to 0.4 mm, permanently blocking water ingress. The process is self-sealing — new cracks that form over time will trigger additional crystal growth if moisture is present.
How do your products comply with NESREA effluent discharge limits?
All our chemical formulations are tested to ensure they do not leach volatile organic compounds (VOCs) or heavy metals into groundwater. HydroShield XT and CorroStop VCI have been verified to meet NESREA’s National Environmental (Surface and Groundwater Quality Control) Regulations, 2011. We provide material safety data sheets (MSDS) and compliance certificates upon request for each batch supplied.
Can your admixtures be used in existing mix designs without altering compressive strength?
Yes. HydroShield XT and CorroStop VCI are formulated to be compatible with standard Portland cement mixes and common supplementary cementitious materials (fly ash, slag, silica fume). They do not affect setting time or 28-day compressive strength when dosed according to our technical datasheets. We recommend trial batching to confirm workability under local aggregate and water conditions.
What is the recommended application temperature for PermaSeal Flex joint sealant?
PermaSeal Flex can be applied in ambient temperatures ranging from 5°C to 40°C. The substrate must be dry, clean, and free of laitance. For best results, the sealant temperature should be between 10°C and 30°C at the time of application. Below 5°C, curing slows significantly; above 40°C, pot life shortens. We provide a cold-weather and hot-weather application guide with each shipment.
How do you verify corrosion inhibition performance in chloride-rich environments?
CorroStop VCI performance is validated using accelerated corrosion testing per ASTM G109 and ASTM A944. Field trials on Lagos bridge decks showed a 60% reduction in corrosion rate over 24 months compared to untreated controls. We also conduct chloride penetration testing (ASTM C1202) and linear polarization resistance measurements to quantify protection levels. Reports are available for client review.
What is the shelf life and storage requirement for your chemical admixtures?
HydroShield XT and CorroStop VCI have a shelf life of 12 months when stored in sealed containers at temperatures between 5°C and 35°C, away from direct sunlight and moisture. PermaSeal Flex components have a 9-month shelf life under similar conditions. We label each container with the manufacture date and batch number. Extended storage beyond these periods requires re-testing before use.
