Abstract: The application of ultrahighstrength pumping concrete is becoming more and more widespread, but there are still problems, the design of mixing proportion does not have corresponding specifications, the preparation process mostly depends on experience, and the technology is not yet mature. In order to meet the using requirements of ultrahighstrength pumping concrete, and to clarify the influence of key mixing proportion parameters on the compressive strength of ultrahighstrength pumping concrete, the influence law of preparation parameters such as cement type, the amount of cementing material, the type of mineral admixture, the watertobinder ratio and the gravel type on the concrete compressive strength are systematic studied, and the C100 ultrahighstrength pumping concrete that meets the engineering requirements is prepared. The study results show that: (1) For the preparation of C100 ultrahighstrength pumping concrete, the type of cement and the crushed stone are the two key parameters, and the P·Ⅱ 52.5 cement and the rock with high strength of the parent rock should be selected. (2) Under the experimental conditions, the dosage of gelling material should be 640 kg/m3, the amount of mineral admixture should be 25% (silicon ashcontaining admixture system should be used), and the waterbinder ratio should be 0.20.

Key words: C100 concrete, ultrahighstrength pumping concrete, mineral admixture, mixing proportion, fuzzy statistics