How to Waterproof UHPC Curtain Walls in Humid Regions?

Waterproofing treatment for UHPC curtain walls in humid regions requires a four-dimensional solution of "panel waterproofing + joint sealing + node protection + drainage and water diversion", primarily addressing moisture penetration, mold growth, and metal component corrosion. Through material optimization and process upgrades, Qinglong has achieved a 100% waterproofing pass rate for projects in humid regions, with no leakage or mildew after 10 years of use.

I. Panel Waterproofing: Enhancing the Panels' Own Impermeability

Panel waterproofing itself is the first line of defense. Material optimization: adjust the UHPC formula by increasing mineral admixture content (silica fume 15%-20%), reducing the water-cement ratio (≤0.24), and improving density (≥2.4g/cm³); Qinglong's UHPC for humid regions has an impermeability grade of ≥P15 with no capillary water seepage. Surface treatment: brush a silane impregnation agent onto the panel surface (penetration depth ≥3mm) to form a waterproof protective film; after silane impregnation, Qinglong panels' water absorption rate is reduced by 60% with no surface condensation. Edge treatment: chamfer panel edges and corners (R≥8mm) to prevent sharp edges from cutting the sealant; Qinglong's chamfering precision is ≤±0.5mm, with smooth, burr-free edges.

II. Joint and Node Waterproofing: Sealing Leakage Channels

Joints and nodes are the weak links in waterproofing and require focused treatment. Joint sealing: use neutral weather-resistant silicone sealant (water-resistant type) with joint widths of 10-12mm; insert foam rods before applying the sealant, forming the sealant joints in an arc shape; Qinglong's sealant shows no loss of bond strength after 7 days of water immersion, ensuring durable waterproofing. Node protection: for metal nodes such as anchors and bolts, apply dual protection with waterproof gaskets (butyl rubber) + sealant to prevent moisture from penetrating through node gaps; Qinglong's node waterproof gaskets are ≥5mm thick with a compression deformation rate of ≤10%. Door and window opening treatment: install waterproof edge trim around openings (metal cover plates + sealant) and reserve drainage grooves (width ≥10mm); Qinglong's opening drainage grooves have a slope of ≥3% to prevent water accumulation.

III. Drainage Design and Ongoing Maintenance

The drainage system and maintenance ensure long-term waterproofing effectiveness. Curtain wall drainage: reserve drainage holes in panel design (diameter ≥10mm, spacing ≤1.5m) and install drainage channels on the inner side of the curtain wall to discharge small amounts of infiltrated moisture; Qinglong's drainage holes are fitted with filter screens to prevent debris clogging. Regular maintenance: inspect sealant aging annually (cracking, peeling) and replace the sealant every 5 years; Qinglong provides free inspection services for projects in humid regions to promptly address waterproofing risks. Project cases: an UHPC curtain wall at a seaside hotel in Sanya (high-humidity, high-salt-spray environment) adopted the four-dimensional waterproofing solution with no leakage after 8 years of use; an UHPC interior wall in a basement in Nanning shows no mildew or moisture return after waterproofing treatment.