Analysis And Experimental Study On Textile Reinforced Concrete Elements

Textile is made of fiber roving through knitting technology in two or three dimensions. Textile reinforced concrete (TRC, for short) shows several significant advantages. Contrary to steel, most textiles do not corrode in carbonated or chloride containing concrete which permits reducing the concrete cover just large enough to transfer bond stresses from the reinforcement to the concrete. This allows production of thin reinforced concrete elements. As a kind of continuous fiber reinforcing material, textiles make a high effectiveness of the reinforcement for concrete instead of short-cut fibers distributed randomly in concrete because roving can be oriented in line with the occurring stresses. Carbon fibers are antimagnetic and the building made use of carbon textile reinforced concrete can protect instruments in it against magnetism. Due to these advantages above, many have been focused on development of TRC. In this paper, combined with the key program of the National Natural Science Foundation of China 'Research on the mechanism of crack formation and propagation in concrete structures and crack control method', a series of tests and analytical work about the mechanical properties and long time behavior of TRC have been completed, and many conclusions have been obtained.1. A matrix which offers a self-compacting capability, rapid hardening, and high early strengths as well as chemical compatibility with AR glass textile which is proved by the ageing tests, has been developed out. Due to smaller graze size, this matrix is named as ' high performance fine concrete'.2. Some mechanical properties of textiles used in this test, such as tensile strength, Young's modulus and ultimate strain, are mensurated.3. The pullout mechanism of interface crack of fiber roving between fine concrete is analyzed on the base of fourfold linear model, which offers a way to verify bond parameters and estimate structure's responding of TRC under pullout force.4. The influences of the initial bond length of textile, the sand coating of textile, the strength and workability of concrete as well as the level of prestressing force on bond behavior have been investigated on the base of pullout tests.5. The influences of the sand coating of textile, the ratio of reinforcement and the level of prestressing force on behavior of concrete cracking have been investigated on the base of bending tests of one-way slab.6. The resistances to bending, such as ultimate bearing moment and cracking moment, have been analyzed and corresponding calculating methods have been developed.7. In this paper, the ultimate bearing moment of TRC beam with T-shaped cross-section is calculated through two ways. In one way, the compressive force and its working point are gotten by integral method, and in the other way, the compressive stress showing curve-figure distribution in the pressed zone of concrete is transformed into equivalent rectangle and for different marginal compressive strains, the equivalent coefficients of rectangle beam are adopted for the calculation of the compressive force and its working point of TRC beam with T-shaped cross-section. At last, the results from the two ways above are analyzed and contrasted...