High-strength and high-performance concrete for deep frozen well wall and preparation method thereof

Abstract

The invention discloses high-strength and high-performance concrete for a deep frozen well wall and a preparation method thereof. The concrete is prepared from the following components in parts by weight: 380-460 parts of cement, 0-43 parts of silicon powder, 0-110 parts of slag, 390-550 parts of a binding material, 650-726 parts of sands, 1108-1190 parts of stones, 146-184 parts of water and 2-8% a water reducer based on the total weight of the concrete. The preparation method comprises the following steps: after adding the cement, silicon powder, slag, sands and stones and uniformly mixing, adding water; and after adding water to further uniformly stir, adding the bonding material and the water reducer to uniformly stir. The concrete disclosed by the invention is good in early-high-strength, and the mould can be disassembled in about 8 hours; the concrete is simple in preparation process and good in workability, the collapsbillity is 120-180mm, and the concrete is convenient to convey and pour; the concrete is low in heat of hydration and high in durability; and the concrete is anti-crack and anti-penetration.

Description

technical field [0001] The invention relates to a concrete material, in particular to a deep-frozen well wall high-strength high-performance concrete and a preparation method thereof. Background technique [0002] The topsoil and weathered bedrock sections of the main shaft, auxiliary shaft and air shaft of the coal mine are constructed by freezing method. The thickness of the three shafts passing through the topsoil layer is at least 450m, and the designed net diameter of the shaft is at least 6m. [0003] Due to the deep topsoil layer that the three frozen shafts pass through, the large diameter of the shaft, and the complex stress on the shaft wall, it is necessary to adopt a high-strength shaft wall structure. Ordinary concrete structures cannot resist strong external loads. Considering the special construction environment of frozen shafts, whether it is low-strength concrete or high-strength concrete, higher requirements are placed on the performance of concrete. The s...

AI Technical Summary

Problems solved by technology

Ordinary concrete structures cannot withstand strong external loads. Considering the special construction environment of frozen shafts, whether it is low-strength concrete or high-strength concrete, higher requirements are placed on the performance of concrete