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Dayu GroupDayu Group was founded in 1998. It is a large-scale modern comprehensive enterprise integrating R & D, production, sales, construction and technical services. It is one of the leading enterprises in China's waterproof industry. Waterproof industry's top ten most influential brands, China's top 500 building materials enterprises, China's top 500 real estate enterprises preferred material suppliers.
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ProductsDayu Group has advanced production equipment and R & D resources, domestic and foreign joint R & D center and production base. With exquisite technology to achieve continuous upgrading and innovation of products, a number of products have been included in the national construction industry waterproof special scientific and technological achievements promotion project, obtained the first-class construction qualification of waterproof, thermal insulation and anti-corrosion integration, and provided high quality waterproof series products and construction services for many national major projects.
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ApplicationDayu Group and China Academy of Building Research have jointly established Dayu Technology Research and Development Center (provincial level) and Engineering Research and Development Center. Waterproof materials can be widely used in underground, roof, tunnel, high-speed rail, subway, bridge, municipal, environmental protection and other fields. In order to solve the problem of building waterproof leakage to provide a comprehensive and efficient solution, to achieve the same life of waterproof materials and buildings.
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CaseDayu Group has provided high quality waterproof products and construction services for major national projects such as the Olympic Village of the Beijing Olympic Games, Wukesong Gymnasium, Beijing Morgan Center, Shenyang Metro, Qingdao Metro and so on. at the same time, it has also reached strategic cooperation with many well-known real estate enterprises such as Longhu Real Estate, China Merchants Group and Greenland Group.
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Contact UsNational unified hotline: 400-990-6678
Email: lndy@lndy.top
Join us: +86-427-5918022
Started in 1998, the world's leading integrated provider of waterproof services
Since 1998，Leading Integrated Waterproof Provider In The World！
Product overview
Dayu®The salt-resistant modified asphalt waterproofing membrane is a hot-melt waterproofing membrane composed of tire base, salt-resistant modified asphalt gum and surface material.
l fetal baseHigh quality filament polyester felt.
l Glial: Thermoplastic elastic rubber (styrene-butadiene-styrene) as a modifier to modify the petroleum asphalt, into the special salt-resistant formula raw materials, prepared into a dip coating gum, evenly coated on both sides of the tire base.
l Surface material: Polyethylene film, fine sand or mineral granules.
Product Features
l It has good salt-alkali resistance and does not corrode when placed in a high saline-alkali environment for a long time.
l Resistance to chloride ion penetration, effectively protect the safety of structural concrete.
l High tensile strength, strong tear resistance, good dimensional stability, excellent mechanical properties, and strong resistance to breakage.
l Excellent resistance to high and low temperature performance, low temperature not brittle crack, high temperature does not flow, good durability, long-term protection of waterproof ability.
l Mature hot melt method construction process, molten asphalt body lap, reliable bonding, lap firmly, suitable for all seasons.
l It can form a composite waterproof layer with other compatible coatings or coils to meet higher grade waterproof requirements.
Specification classification
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Upper surface material |
Polyethylene film (PE)/S (fine sand)/M (mineral pellets) |
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Thickness |
3.0mm/4.0mm |
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Width |
1000mm |
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Length |
7.5m/10m |
Scope of application
l It is suitable for industrial, civil, municipal and other construction projects, including administrative, residential, commercial, scientific research, medical, school, grain depot, pipe gallery and other buildings.
l It is suitable for underground waterproof engineering and roof waterproof engineering of buildings such as coastal areas eroded by chloride ion and acid salt, inland alkaline soil areas, and transformation of chemical parks. Wherein, the surface material of mineral grains can be used for non-human roof exposed waterproof.
Construction process
l Basic requirements: solid, dry, no sediment, laitance, no empty drum, loose, sand and other phenomena.
l Interface treatment: uniform spray (roll) coating matching base treatment agent, improve the coil and the adhesion of the base.
l Trial laying of coiled material: lay the coiled material flat on the base surface, align the elastic line or the overlapping edge of adjacent coiled material, adjust the overlapping width, and rewind after standing for a period of time to release the stress.
l Hot melt paving: bake the lower surface and base surface of the coil with a flame, push the roll-paving coil forward in time after the colloid is melted, and compact and exhaust while it is hot to tightly bond the coil with the base layer.
l Ontology lap joint: paving and pasting synchronous rolling lap joint edge until 5~8mm molten asphalt is extruded (regarded as reliable lap joint).
performance index
Products in accordance with the national standard "elastomer modified asphalt waterproofing membrane" GB18242-2008 manufacturing.
The physical and mechanical properties of the product meet the requirements of the standard, and the complete index is shown in the standard.
List of basic physical performance indicators of polyester base coil:
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Project |
Indicator (Type I) |
Indicator (Type II) |
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Soluble content |
≥ 2100g/㎡(3mm) ≥ 2900G/㎡(4mm) |
≥ 2100g/㎡(3mm) ≥ 2900G/㎡(4mm) |
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Heat resistance |
No flowing or dripping at 90 ℃, slippage ≤ 2mm |
No flowing or dripping at 105 ℃, slippage ≤ 2mm |
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Low temperature flexibility |
No crack at -20 ℃ |
No crack at -25 ℃ |
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impervious to water |
0.3MPa, impervious to water for 120min |
0.3MPa, impervious to water for 120min |
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Pull force |
≥ 500N/50mm |
≥ 800N/50mm |
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Elongation |
≥30% |
≥40% |
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Joint peel strength |
≥ 1.5N/mm |
≥ 1.5N/mm |
The salt-alkali resistance of the product shall meet the JTJ275-2000 requirements of Technical Code for Corrosion Protection of Concrete Structures of Harbour Engineering.
List of performance indexes of salt-alkali-resistant products:
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Project |
Test conditions |
Standard |
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Coating appearance |
After 1000h of aging resistance test |
No chalking, no blistering, no cracking, no peeling |
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After 30 days of alkali resistance test |
No blistering, no cracking, no peeling |
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After standard curing |
Uniform, no sagging, no spots, no blistering, no cracking, no peeling, etc. |
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resistance to chloride ion penetration |
After 30 days of resistance to chloride ion penetration test of movable coating sheet |
The penetration of chloride ions through the coating sheet is 5.0 × 10-3mg/cm2below d |
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