The specialists from the Military Training Center of the Far Eastern Federal University (RF) have developed impact-resistant fiber-reinforced concrete with high dynamic viscosity and resistance to cracking.
This type of material is designed for protective structures built in civil defense and emergency purposes, for fortifications and various special facilities.
The impact endurance of new concrete increases in proportion to the applied impact. Crack resistance exceeds traditional state standard specifications (GOSTs) of concrete by 6–9 times.
Structures made of impact-resistant concrete can protect, for example, from a plane fall, shell hit, withstand tsunamis or earthquakes.
The impact-resistant concrete has less cement in its composition than conventional one. Instead, it incorporates industrial wastes: ash of rice husk, quartz sand, screening of crushed limestone. The engineers managed to achieve high resistance to impact load by introducing basalt fibers into the composition.
Various research on reinforcing basalt fibers for concrete has been doing worldwide. Such properties as strength, wear resistance are increasing significantly, cracking and crumbling in high-strength reinforced concrete are prevented, while the weight of structures is reduced. Applications with expected heavy loads are of particular interest.
The engineers from the Military Training Center offer to add basalt fiber also to other concrete types to improve the performance. They suggest applying basalt-fiber high-strength concrete for the construction of the Vostochny space-vehicle launching site, nuclear power plants, arctic and underground structures.
We verified the balance of components with an accuracy of 0.5%. It was important for us to delay the the first crack appearance to the utmost, because when the first crack is occurred, the process of structural destruction cannot be stopped.
The world currently sees a trend towards the development of anti-terrorist variants of high-security facilities that will be able to secure structures in the event of, for example, a plane fall or a shell hit. We approached this issue from the standpoint of developing a special-purpose impact-resistant material.
By the way, during the next stage we are planning to develop concrete type that can protect against radioactive radiation,
says the professor of the Center for Higher Professional Education FEFU, Lt. Col. Roman Fedyuk.
The impact-resistant fiber-reinforced concrete is cost-effective and does not require large investments for production modernization, developers say. The market researchers claim that basalt fiber applied as a reinforcement for concrete will grow by 7.4% per year in the period 2018 – 2025.
Translated by Olga Yurchenko