Most research on GRC / GFRC-reinforced concrete dates back to the early 1960s.
The studies were mostly conducted on boro-silicate fiber commercially known as Pyrex (glass E) and Sodium carbonate -lime- Silica (glass A) fiberglass
The resistance of GRC / GFRC made of the afore-mentioned fibers declines after a relatively short time due to the high alkalinity of the cement paste matrix. Because these two types of fibers are unstable in alkaline environments due to the high percentage of silica, and were therefore non-suitable for long-term applications.
Further research led to production of alkaline-resistant fiberglass (glass-AR) and more stable GRC / GFRC products. The produced Concrete were called GFRC-AR. The research was first conducted by the British Building Research Establishment (BRE) in 1976. They managed to produce fiberglass products containing 16% Zirconium with favorable resistance against alkaline environments.
In 1971, glass-AR was mass-produced by Fill-Cem. Later on, NEG in Japan, produced glass-AR with 20% zirconium in 1975. The use of glass-AR in production of GRC / GFRC has increased ever since.
In the 1970s, the first standard specification of glass fiber was published, and in the 1980s, the GRC / GFRC was used to produce panel walls in 12 building construction projects in the United States.
Over the past two decades, these products have been widely used in different areas. Today, various types of fiberglass with different properties are produced all around the world. Glass-AR, is the latest generation of fiberglass that is produced by FIL-Cem and NEG and exported to different countries all around the world. These fibers are called fiberglass mainly because they have a glass base (Sio2). Fiberglass is made of various oxides such as sodium oxide, silica, lime and the like.
As already mentioned, in the new generation of fiberglass (glass-AR), addition of ZRO2 can enhance the stability of fibers in alkaline environments, and in concrete environments in particular.
Some properties of fiberglass such as high elasticity modulus relative to polypropylene fibers, resistance to alkaline environments and high tensile strength of the concrete made of these fiberglass, have provided the ground for widespread application of them in the construction industry, and in building facade in particular.
AR-Glass is a durable alkaline-resistant glass made of Zirconium silicate which is used in concrete layers