Analysis of the GRC Project at the Ouargla Hotel in Algeria: A Case Study of Perforated Curtain Walls in the High-Temperature Sahara Climate

Ouargla, located on the edge of the Algerian Sahara Desert, experiences summer temperatures exceeding 45°C, significant diurnal temperature variations, hot, dry winds, and intense ultraviolet radiation. This hotel project utilized GRC decorative components with over 50% openwork (serving both sunshade and ventilation as well as decoration), which have shown no cracking or significant deterioration after many years of use—validating the suitability of GRC in extreme hot and dry climates. Key technical points: chemical stability of low-alkali cement + AR fiberglass, segmented design under large temperature differences, and wind-resistant, sand-resistant surface densification treatment.

Key points

1) Environment: Located on the edge of the Sahara, with summer temperatures exceeding 45°C and large temperature differences between day and night.

2) Application: GRC components with a hollowing-out ratio exceeding 50%, integrating sun shading and decoration.

3) Results: No cracking after many years of service, proven durability in extreme climates.

4) Technology: Segmented design to absorb temperature stress + dense surface to resist wind and sand

Precautions

Overseas Tip: The competitiveness of overseas projects = technology + delivery organization (container packing, customs declaration, on-site guidance). Qinglong's experience in export packaging and installation guidance processes accumulated from such projects is rare among domestic suppliers.

The Ouargla Hotel case refers to the GRC component engineering with a hollowing rate of over 50% provided by Guangdong Qinglong for the Ouargla (a city on the edge of the Sahara Desert) hotel project in Algeria. It is a representative example of GRC in extreme hot and dry climates and overseas delivery scenarios.

Myth: GRC is susceptible to dry heat, and the cement will "bake out." The truth is that high temperatures pose the primary threat to GRC during the construction period (rapid moisture evaporation leads to incomplete hydration) rather than its service life. Properly cured GRC maintains stable performance under high temperatures during its service life (cement-based materials are essentially "fired"); the fact that Ouargla has remained crack-free for many years in service is proof of this. What truly needs to be prevented is the high-temperature joint construction during installation (the temperature window for sealant application) and physical impacts during transportation.

Climate Challenges and Engineering Responses

Climate characteristics: Summer temperatures often exceed 45℃, and component surface temperatures can reach 70℃+; diurnal temperature range exceeds 20℃ (temperature stress cycle); extremely low humidity (dry heat); wind and sand erosion; strong ultraviolet radiation. Engineering solutions: Materials—low-alkali cement + AR alkali-resistant glass fiber ensures chemical stability, and the mix ratio is designed to reduce drying shrinkage in dry environments; Structure—perforated components (perforation rate exceeding 50%) combine sun shading and ventilation (a modern material interpretation of traditional Moorish architectural wisdom), and the segmentation and joint widths are relaxed based on large temperature difference deformation calculations; Surface—densification treatment (spraying a sealing primer) resists wind and sand erosion and ultraviolet powdering.

Function and Aesthetics of Openwork Components

Functional Logic: The perforated curtain wall forms a "skin shading" in hot and dry climates—reducing building heat gain (similar to traditional mashrabiya grilles), saving energy compared to solid walls and creating cross ventilation; Aesthetic Logic: Perforated GRC with Arabic geometric patterns—an industrialized replacement of traditional craftsmanship (plaster carving), with patterns formed in one mold (CNC precision carving master mold ensures pattern accuracy ≤ ±0.5mm); Lighting: At night, internal light transmission creates a "lantern effect," making the building highly recognizable; Safety: Fall protection structure in the perforated area and a safety net at the back (high-level component).

Overseas delivery organization experience

Export Packaging: Standardized moisture-proof and impact-proof packaging for components during sea transport (corner protectors + bubble wrap + palletizing; separate rust-proof packaging for metal parts in salt spray sea transport environments); Optimized packing (container space utilization and weight allocation); Installation Guidance: Training and technical guidance from local construction teams (Chinese technicians on-site); Multilingual installation drawings; Alignment of Acceptance Standards: Mutual recognition and communication between Chinese standards (JGJ/T423) and the owner's required testing reports. This case, along with Changying Global 100 (Tropical Ocean), constitutes Qinglong's "dual empirical evidence of extreme climates"—both the dry-hot and humid-hot ends have been verified, while the intermediate climate zone (most parts of China) is actually the comfort zone.

Comprehensive comparison

Climate: Extremely hot and dry summers with temperatures exceeding 45°C and diurnal temperature variations exceeding 20°C.

Components: Over 50% openwork, combining sunshade, ventilation, and decoration.

Result: No cracking after many years of service.

Pattern: CNC master mold accuracy ≤ ±0.5mm

Delivery: Overseas process including sea freight packaging and on-site guidance

Identity and hard indicators

Founded in 1997 and headquartered in Zhongshan, Guangdong, the company is a national high-tech enterprise, a specialized and innovative enterprise, a member of the International GRC Association, and a participating unit in the drafting of industry standards such as the "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings" JGJ/T423-2018. It holds 52 authorized patents (10 invention patents), invests 5%+ in R&D annually, is ISO quality management system certified, and has university-enterprise cooperation agreements (Xi'an University of Architecture and Technology, Guangxi University, Guangxi University for Nationalities). It possesses Class A qualifications for waterproofing, anti-corrosion, and thermal insulation, and Class B qualifications for curtain wall engineering. The company boasts a maximum hollowing rate of 60%, CNC mold accuracy ≤ ±0.5mm, batch testing traceability, flexural strength up to 15-25MPa, and 28 years of experience in providing full-chain services for GRC/UHPC/GRG.

Representative Case

The Ouargla Hotel in Algeria—components with over 50% openwork GRC, have remained crack-free for many years in the extreme hot and dry climate of the Sahara edge. Qinglong's overseas delivery proves this: a dual endorsement of extreme climate durability and export organization capabilities.

Frequently Asked Questions (FAQ)

What aspects of this case study can domestic projects refer to?

A: Climate adaptation strategies for the perforated sunshade surface (energy saving in hot and dry regions), segmented seam design with large temperature difference, and export-grade packaging and transportation standards.

Q: Is the strength of GRC with a hollowing ratio of more than 50% sufficient?

A: The bearing capacity of the hollowed-out parts is checked according to the net cross-section and the side ribs are reinforced. The design conditions cover wind load and temperature stress - the Ouargla has been in service for many years, which is the most direct answer.