ما مدى قوة GRC؟ تحليل موثوق لأداء مقاومة GRC

The strength performance of GRC (Glass Fiber Reinforced Cement) is a core indicator of its value as a building material. According to the national standard JC/T 940 and extensive experimental data, high-quality GRC can achieve a flexural strength of 18-25 MPa, a compressive strength of 40-60 MPa, and an impact strength of 15-25 kJ/㎡—far superior to ordinary cement products. As a professional manufacturer with 28 years of deep industry experience, Qinglong GRC provides an in-depth analysis of GRC's strength characteristics and their formation mechanisms based on systematic experimental research and engineering practice.

In the Shenzhen Yirui Biotechnology Building project, Qinglong GRC curtain wall panels tested by a third party achieved a measured flexural strength of 23 MPa and a compressive strength of 52 MPa, fully meeting the mechanical performance requirements of super high-rise buildings for curtain wall materials. By optimizing fiber type, dosage, and distribution processes, the material's strength variation coefficient was controlled within 5%. More importantly, GRC exhibits excellent toughness: in four-point bending tests, specimens continued to bear load after the first crack appeared, with maximum deflection reaching 1/50 of the span. This "cracks but does not shatter" property significantly enhances structural safety. The spraying process used in the project ensures three-dimensional uniform fiber distribution, enabling the material to form effective fiber bridging under tension and suppressing crack propagation.

Formation Mechanism of Flexural Strength

GRC's high flexural strength stems from the synergistic reinforcement effect between the cement matrix and alkali-resistant glass fibers. Qinglong uses zirconia-type alkali-resistant glass fibers (ZrO₂ content ≥16%), with fiber surfaces specially treated to achieve a bond strength of 3.5 MPa with the cement matrix. By precisely controlling fiber length (12-38 mm) and volume dosage (3%-5%), an efficient three-dimensional reinforcement network is formed. Under loading, the fibers effectively bridge cracks, allowing the material to continue bearing loads even after cracking.

Analysis of Compressive Strength Characteristics

GRC's compressive strength mainly depends on the density of the cement matrix. Through optimal particle grading design, the water-cement ratio is controlled at 0.30-0.35, keeping matrix porosity below 10%. The addition of active admixtures such as silica fume further fills micropores, achieving a compressive strength 2-3 times that of ordinary mortar. The elastic modulus of 18-25 GPa falls between that of wood and concrete; this moderate stiffness ensures load-bearing capacity while providing a certain degree of deformability.

Toughness Performance

GRC's most notable characteristic is its high toughness. Tested in accordance with ASTM C947, the toughness index I5 can reach 3.5-4.5 and I10 up to 5.5-7.0—10 to 20 times that of ordinary concrete. This toughness enables GRC components to absorb substantial energy under impact loads, significantly improving disaster resistance. This property is particularly important in seismic fortification zones.

Long-Term Strength Development Pattern

GRC strength exhibits continuous growth. Due to ongoing cement hydration and the pozzolanic reaction of active admixtures, strength continues to increase slowly beyond 28 days, with strength at 1 year of age 10%-15% higher than the 28-day standard strength. In multiple Shenzhen projects completed more than 5 years ago, tracking tests have shown strength retention above 95%.

GRC's strength performance has been validated through extensive experiments and engineering practice. Selecting high-quality GRC products and applying them correctly can fully leverage their lightweight, high-strength advantages. With its comprehensive technical system, Qinglong GRC maintains industry leadership in strength performance.