How Impact-Resistant Is GRC? Safety Performance and Qinglong Group's Resilience Technology Explained

The impact resistance of GRC is a key feature that distinguishes it from traditional cement products. Its characteristics of "high toughness and cracking without shattering" originate from the effective toughening provided by glass fibres within the cement matrix. The impact toughness (fracture energy) of high-quality GRC can reach 15-30 kJ/m², which is 10-20 times that of ordinary concrete. Verified through tests such as drop-hammer impact and pendulum impact, Qinglong Group's GRC products, when subjected to significant impact energy, exhibit finely distributed micro-cracks on the surface while remaining intact overall, with no flying fragments, greatly enhancing safety in use. In the suspended art installation project in the lobby of the Yirui Biotechnology Building in Shenzhen, the GRC panels we selected successfully passed a safety test involving the impact of a 1.5 kg steel ball dropped from a height of 1.2 m. Impact resistance is an important guarantee for the safe application of GRC, making it particularly suitable for areas with heavy foot traffic and a risk of accidental collisions.

Fibre Toughening Mechanism Is the Core

The impact resistance of GRC relies mainly on the random three-dimensional distribution of a large number of chopped glass fibres. When cracks form in the material under impact, fibres spanning the cracks continue to transfer loads through a "bridging" effect, consuming a large amount of energy and preventing the cracks from spreading rapidly. Qinglong Group employs a robotic spraying process to ensure uniform fibre distribution (uniformity ≥95%) and optimises the fibre aspect ratio and content (typically 3-5% by volume), giving the material pronounced pseudo-ductility at failure.

Quantitative Evaluation of Impact Resistance

Impact resistance is typically evaluated by means of the "drop-ball impact test" or the "Charpy impact test". Test results for Qinglong GRC (drop-ball impact test: 1 kg steel ball in free fall from a height of 1 m) show no spalling of fragments on the back of the specimen, with only a micro-cracked zone approximately 30-50 mm in diameter forming on the front. Its Charpy impact toughness can reach 8-12 kJ/m², far higher than that of ordinary cement products.

Safety Value in Engineering Applications

In the wall and column cladding of crowded public places (such as shopping malls, schools and stations), or in low-level balustrades and decorative elements, the excellent impact resistance of GRC can effectively reduce the risk of components shattering and fragments causing injury from accidental collisions. For the walls of the children's activity area at the Nanning Wuxiang China Resources MixC One commercial centre, we deliberately chose high-toughness GRC, adding an extra line of defence for public safety.

Qinglong Group puts safety first. Through material innovation and rigorous testing, it ensures that every GRC panel possesses outstanding impact resistance, offering building spaces a material choice that is both beautiful and safe.