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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。
PHC pipe pile concrete was prepared by single and double mixing of quartz powder (QP) and fly ash (FA). The cubic compressive strength (f_ (cu) ), Splitting tensile strength (f ts) and axial compressive strength (f cp). The results show that compared with the pure cement concrete specimens, the content of single-doped quartz powder is the most obvious for increasing the f_ (cu) and f_ (cp) amplitudes in the range of 10% ~ 30% The f_ (cu) and f_ (cp) slightly increased when single mixed fly ash was added, but f_ (cu) and f_ (cp) decreased when the fly ash was more than 10% f_ (cp) required under the premise of quartz powder and fly ash mixed with each pair is conducive to improving f_ (ts). Compared with the pure cement concrete specimens, whether single or double compounded quartz powder, fly ash, can improve the toughness of PHC pipe pile concrete, and the most obvious effect is the incorporation of fly ash; SEM analysis shows that the mixed Into the fly ash pressure steaming paste sample hydration macropores less formed a more obvious space grid structure, help to improve the toughness of concrete piles.