Wu YAO
材料科学技术（英）
The flexural and impact resistance of a newly developed FRC/bamboo laminate have been investigated. The laminate considered in this study was combined with reformed bamboo plate and extruded fiber reinforced cementitious (FRC) sheet. Innovated from the raw bamboo, reformed bamboo showed high tensile strength and high strength to weight ratio. It can not only remarkably strengthen the FRC sheet but also reduce the total weight of the laminate. Flexural and impact load, broken energy, deflection and duration were measured. Test results showed that the flexural strength value for the laminate can be improved to greater than 90 MPa, while the impact resistance is increased more than 10 times for the laminate when compared with the FRC sheet only.
关键词:
Flexural strength
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Wu YAO
材料科学技术（英）
By heating up the embedded carbon fiber reinforced cement based material (CFRC), the carrying capacity and deformation of concrete member could be adjusted. The relationship between temperature difference and expansion strain of CFRC was demonstrated, and the temperature-deformation-load effect of concrete embedded with CFRC was studied. Heating the CFRC up to different temperatures resulted in different degree of inner pre-stress in concrete. Thus, the load capacity of concrete could be regulated owing to counteracting the pre-stress.
关键词:
Carbon fiber
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Wu YAO
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Jie LI
材料科学技术（英）
A superfine slag powder (SP) made from granulated blast furnace slag incorporating activators by using special milling technique, was used as supplementary cementitious material in high performance concrete (HPC), replacing part of the mass of normal Portland cement. The effects of the SP on the workability, mechanical and crack self-healing properties of HPC were studied. The hydration process and microstructure characteristics were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques, respectively. The crack self-healing capacity was evaluated by Brazilian test. The test results indicate that the SP has especially supplementary effect on water reducing and excellent property of better control of slump loss. The concrete flowability increases remarkably with the increase of SP replacement level in the range of 20% to 50%. The compressive and splitting tensile strengths of HPC containing SP are higher than the corresponding strength of the control concrete at all ages. The crack self-healing ability is highly dependent on SP content of HPC.
关键词:
Superfine slag powder
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