The application of ultrahighstrength 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 ultrahighstrength
pumping concrete, and to clarify the influence of key mixing proportion
parameters on the compressive strength of ultrahighstrength pumping concrete, the influence law of preparation
parameters such as cement type, the amount of cementing material, the type of
mineral admixture, the watertobinder ratio and the gravel type on the concrete compressive
strength are systematic studied, and the C100 ultrahighstrength pumping concrete that meets the engineering requirements is
prepared. The study results show that: (1) For the preparation of C100 ultrahighstrength 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/m3, the amount of
mineral admixture should be 25% (silicon ashcontaining
admixture system should be used), and the waterbinder
ratio should be 0.20.
MU Long
,
YU Fang
,
XIONG Jianbo
,
DENG Chunlin
. Study on Preparation of C100 Ultrahighstrength Pumping Concrete[J]. Tunnel Construction, 2020
, 40(6)
: 793
-799
.
DOI: 10.3973/j.issn.2096-4498.2020.06.003
