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Non-standard reinforcement at the screw hole edges of GRC components can cause four major problems: stress concentration cracking, reduced load-bearing capacity, waterproofing failure, and shortened service life; in severe cases, it leads to component detachment. Through its standardized reinforcement process (embedded steel plates + stiffening ribs), Qinglong has increased the crack resistance strength at screw hole edges by more than 30%, with no such problems occurring across multiple projects.

I. Stress Concentration Cracking: The Most Direct Structural Hazard

Non-standard reinforcement easily turns the screw hole edge into a weak point. Causes of cracking: with no stiffening ribs or embedded steel plates at the screw hole edge, localized stress concentration during screw installation exceeds the tensile strength of GRC (conventional GRC tensile strength ≥2MPa); Qinglong tests show a cracking rate of 30% when installing unreinforced screw hole edges. Manifestations of cracking: radial cracks appear at the hole edge (length ≥5mm, width ≥0.1mm) and widen under load; Qinglong has dealt with hole-edge cracks caused by non-standard reinforcement, with a maximum crack width of 0.5mm. Hazards of cracking: cracks become channels for rainwater and moisture penetration, accelerating GRC aging and reducing component integrity; Qinglong testing found that cracked components are 40% weaker than intact ones.

II. Reduced Load-Bearing Capacity and Waterproofing Failure

Insufficient reinforcement affects connection stability and waterproofing. Reduced load-bearing capacity: non-standard reinforcement at the screw hole edge cannot effectively transfer loads, causing screws to loosen and slip and reducing component load-bearing capacity by more than 50%; in Qinglong tests, the pull-out resistance of screws at unreinforced hole edges was ≤3kN, only 50% of that with standard reinforcement. Waterproofing failure: hole-edge cracks and screw hole gaps allow rainwater to penetrate and corrode internal embedded rebars and screws; Qinglong project inspections found a water seepage rate of 60% at hole edges of components with non-standard reinforcement. Chain reaction: water seepage corrodes metal parts, and the expansion of corrosion products further widens cracks, forming a vicious cycle; in water-seeping components handled by Qinglong, the corrosion depth of metal parts reached ≥0.3mm.

III. Shortened Service Life and Safety Risks

Non-standard reinforcement greatly shortens component service life and creates safety hazards. Shortened service life: cracking, water seepage, and metal part corrosion accelerate component aging, resulting in a service life only 1/2 (about 10 years) that of standard-reinforced components, while Qinglong's standard-reinforced components can last 20-30 years. Safety risks: after long-term use, load-bearing capacity continues to decline; under extreme conditions (strong winds, earthquakes), components may detach, creating a risk of falling objects from height, and similar safety accidents have occurred in the industry. Qinglong's standard reinforcement process: embedded steel plates (stainless steel, thickness ≥8mm) + stiffening ribs (width ≥50mm, thickness ≥15mm) at the screw hole edge, with a reinforcement range of ≥50mm from the hole edge; after Qinglong's reinforcement, the hole-edge crack resistance strength is ≥3MPa and the pull-out resistance is ≥6kN, fully meeting usage requirements. Project case: the GRC cladding panels at Guangzhou Dongzhu Shangdu Commercial City adopted the standard screw hole edge reinforcement process; after years of use, there has been no cracking or water seepage, and the connections remain firm.