Study of the adaptation of the sand concrete as repair material associated with an ordinary concrete substrate
In this paper, a particular importance is given to the sand concrete as a new repair material. A study is conducted to evaluate its mechanical and physical properties. By targeting the compactness and workability, three crushed sand concrete series were made from a fixed choice of the cement content. Once the sand concrete intended for repair is chosen; its characterization is realized by mechanical and physical tests, namely compression and splitting tensile, measurement of modulus of elasticity and the shrinkage. A repair simulation is applied on half-cylinders of ordinary concrete with two ranges of strength, (BO40) and (BO25). The substrates are prepared with two surfaces of different textures: roughness (RIG) and surface with drilled holes (PER). The bond strength and its quality are determined by a splitting tensile test. The result showed a significant improvement in mechanical strength, a low elastic modulus of 21315 MPa and a moderate shrinkage of 426μm/m after 28 days. Similarly, significant bond strength is recorded between sand concrete and ordinary concrete, reflecting a good adhesion with the substrate.
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