Abstract
In order to better match the multi-level structural characteristics and multi-scale fracture process of cementitious composite, multi-scale hybrid fiber-reinforced strain hardening cementitious composite (MsHySHCC) was designed by adding hooked steel fiber and calcium carbonate (CaCO3) whisker into conventional polyvinyl alcohol (PVA) fiber-reinforced SHCC. Compressive properties of PVA-SHCC and MsHySHCC were evaluated experimentally. The results indicate that the designed MsHySHCC had a better compressive performance than that of PVA-SHCC. Moderately partially substituted PVA fibers by steela fiber and CaCO3 whisker enhanced the compressive parameters, however, further substitution of PVA fibers by increasing the content of CaCO3 whisker didn’t bring a higher promotion. Two kinds of semi-theoretical compression constitutive models were developed from the perspective of damage mechanics theory and geometrical mathematical description, respectively. It was found that both of the proposed models can be applied to predict the uniaxial compressive stress-strain relationships of PVA-SHCC and MsHySHCCs.
Highlights
RESUMEN: Estudio experimental y modelo teórico de la relación tensión-deformación en compresión de Strain hardening cementitious composite (SHCC) reforzado con fibras multiescala
Ma et al (26) studied the CaCO3 whisker (CW) effects on the mechanical properties of polyvinyl alcohol (PVA)-SHCCs, and the results indicated that the CW addition improved the compressive property and tensile behavior of PVASHCC
Taking the compressive strength of PVA-SHCC group as an example, its linear fitting curves and probability distributions are illustrated in Figure 5(a) and 5(b), respectively
Summary
RESUMEN: Estudio experimental y modelo teórico de la relación tensión-deformación en compresión de SHCC reforzado con fibras multiescala. Se encontró que ambos modelos propuestos se pueden aplicar para predecir las relaciones de tensión-deformación a compresión uniaxial de PVA-SHCC y MsHySHCCs. Strain hardening cementitious composite (SHCC) has attracted wide attention in the field of civil engineering because of its ultra-high ductility and obvious characteristics of multiple cracking (1, 2). Because the geometry size of commonly adopted PVA fiber and steel fiber can’t well match the microscopic scale of cement hydration product and microscopic cracks, can’t effectively improve the microscopic properties of cementitious materials. A new type of hybrid fiber reinforced SHCC, which is named multi-scale hybrid fiber reinforced strain hardening cementitious composite (MsHySHCC), was designed (12-25). Ma et al (26) studied the CW effects on the mechanical properties of PVA-SHCCs, and the results indicated that the CW addition improved the compressive property and tensile behavior of PVASHCC. They found that the designed MsHySHCC has very satisfactory mechanical properties
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