Rapid-hardening high-strength concrete admixture for mining

Abstract

The invention discloses a quick-hardening high-strength concrete additive for ore. The additive is characterize by comprising the following components by weight percent: 10%-15% of efficient water reducing agent, 1%-5% of basic early-strength component, 0.5%-5% of metal entraining component aluminite powder and 75%-80% of setting accelerating early-strength component, wherein the efficient water reducing agent is obtained by complexing a naphthalene efficient water reducing agent and a sulfamate efficient water reducing agent; and the setting accelerating early-strength component consists of 525 quick-hardening cement and 525 accelerated cement. By using the quick-hardening high-strength concrete additive, the concrete has high flowability, thereby meeting the pumping construction requirement and obviously shortening the setting time of the concrete; and by using the quick-hardening high-strength concrete additive, the concrete has high later strength.

Description

technical field [0001] The invention relates to a fast-setting concrete admixture for low-temperature construction in coal mines, specifically a concrete that can be pumped and hardened under low-temperature conditions so that the concrete has high fluidity and can harden in a short period of time The admixture belongs to the technical field of concrete admixtures. Background technique [0002] Coal mine concrete is a special concrete that is constructed at low temperature. First, because the concrete pouring site is located in the underground and the concrete pumping distance is long, the concrete is required to have high fluidity to meet the construction requirements. At the same time, the temperature in the mine is low, and the setting time of concrete using common admixtures is too long, and may affect the later strength. Therefore, it is required to shorten the setting time of concrete as much as possible to improve construction efficiency and ensure project quality. ...

AI Technical Summary

Problems solved by technology

However, the various concrete admixtures widely used today cannot satisfy the above two requirements at the same time. The ordinary early-strength water-reducing agent compounded with ordinary organic and inorganic early-strength components has a significant effect on the strength of concrete in 3 days and 7 days. It must be improved, but it has no obvious effect on the setting time and hourly compressive strength of concrete

Although the concrete prepared with special cement and quick-setting agent can well meet the setting time requirements, the concrete construction performance is poor, and some concrete prepared with aluminate cement has high early strength, but the later strength declines significantly. , can only be used for temporary repair projects, not for permanent buildings