石英粉、矿粉对PHC管桩混凝土力学性能的影响

发布时间：2018-07-13 17:23

【摘要】：采用石英粉(QP)和粉煤灰(FA)单、双掺制备PHC管桩混凝土,研究了石英粉、粉煤灰对压蒸工艺制备PHC管桩混凝土的立方体抗压强度(f_(cu))、劈裂抗拉强度(f_(ts))和轴心抗压强度(f_(cp))的影响。结果表明:与纯水泥混凝土试件相比,掺量在10%~30%范围内,单掺石英粉对提高f_(cu)和f_(cp)幅度效果最明显,在掺量不超过10%时单掺粉煤灰对f_(cu)和f_(cp)稍有提高,超过10%时则会降低f_(cu)和f_(cp);石英粉和粉煤灰在满足f_(cu)和f_(cp)要求的前提下,石英粉和粉煤灰两两双掺有利于提高f_(ts)。与纯水泥混凝土试件相比,无论单掺或两两复掺石英粉、粉煤灰,均可提高PHC管桩混凝土的韧性,而掺入粉煤灰的效果最为明显;SEM分析表明,掺入粉煤灰的压蒸净浆试件中水化产物大孔少,形成了较为明显的空间网架结构,有利于提高管桩混凝土的韧性。
[Abstract]:The effects of quartz powder (QP) and fly ash (FA) on cubic compressive strength (f _ (cu),) splitting tensile strength (f _ (ts) and axial compressive strength (f _ (cp) of concrete prepared by autoclaving were studied. The results show that, compared with pure cement concrete specimens, in the range of 10% and 30%, the effect of adding quartz powder alone on increasing the amplitude of f _ (cu) and f _ (cp) is the most obvious, and when the content of fly ash is not more than 10%, the content of fly ash on f _ (cu) and f _ (cp) is slightly increased. When the ratio is over 10, the content of f _ (cu) and f _ (cp); quartz powder and fly ash will be reduced. If the requirement of f _ (cu) and f _ (cp) is satisfied, the addition of quartz powder and fly ash will improve the f( ts). Compared with the pure cement concrete specimen, the toughness of PHC pipe pile concrete can be improved by adding silica powder or fly ash, and the effect of adding fly ash is the most obvious. The large pores of hydration products in the steaming paste samples mixed with fly ash are few, and the space grid structure is more obvious, which is helpful to improve the toughness of pipe pile concrete.
【作者单位】：西安建筑科技大学材料与矿资学院;
【基金】：国家自然科学基金青年基金项目(51403170) 陕西省自然科学基础研究计划项目(2015JM5165)
【分类号】：TU528

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