Abstract
Cellular concretes cannot be reinforced as easily as traditional ones. Generally porous materials do not ensure sufficient bond of reinforcement; additionally, due to limited amount of aggregate, interlock between aggregate particles and reinforcement ribs is not satisfactory. The idea of reinforcement presented in the paper incorporates bi-directional composite reinforcing grids placed in tensile zone of the cellular concrete slab where transverse fibres are ensuring anchorage for fibres located in the main direction of stresses. The concept is based on geotechnical applications where grids are commonly used as soil stabilization, but the grids adopted in this solution are much stronger thanks to introduction of high strength fibres as composite reinforcement.
Highlights
Foamed or cellular concrete is generally defined as a type of lightweight concrete in which low density is achieved by increased volume of pores in the microstructure of the material
Air voids are introduced by two main methods: direct introduction of air bubbles having the form of technological foam or by endogenous gas generation achieved by mixing of gas-releasing agents
Desirable is closed cell structure, it can be achieved if the density has a level allowing the cement paste to isolate individual bubbles, which is easier to achieve in mechanically foamed concretes
Summary
Foamed or cellular concrete is generally defined as a type of lightweight concrete in which low density is achieved by increased volume of pores in the microstructure of the material. There are two main methods of aerating: - - by direct introduction of air bubbles through an organic or inorganic foam agent, - - by mixing the gas releasing agents such as hydrogen peroxide, fine aluminium or zinc powders with cement paste. They react with water and hydroxide in an alkaline environment releasing bubbles of hydrogen gas. What is important, foamed geopolymer keeps the strength parameters comparable to the commercially available cellular concrete blocks [5] They are relatively low - especially critically low tensile strength (under 1 MPa) and brittle characteristic. This paper describes promising reinforcing technique based on fibre reinforced polymer grids, shows the results of laboratory tests based on foamed concrete specimens and discusses technical capabilities of adaptation of the presented solution for porous geopolymers (GP concrete)
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