Large-dosage iron tailing high-performance concrete and production technology thereof

Abstract

The invention belongs to the technical field of concrete production, and particularly relates to large-dosage iron tailing high-performance concrete and a production technology thereof. The sand part in the concrete is replaced by iron tailings, and a compound additive is added into the concrete, wherein the weight of the iron tailings accounts for 20-50% of the total weight of the sand and the iron tailings, and the weight of the compound additive accounts for 1-2% of the total weight of the sand and the iron tailings; the compound additive is prepared from a polyhydroxy acid efficient water reducing agent, polyether glycol and nano calcium carbonate at a mass ratio of (1-2):(1-2):(1-2); and the polyether glycol is polyoxypropylene dihydric alcohol of which the functionality degree is 2-3 and the molecular weight is 1,800-2,200. According to the concrete provided by the invention, by replacing partial sand with the iron tailings and adding the compound additive, the performance of a concrete mixture is improved, the cohesiveness of concrete is better, the phenomena such as bleeding, separation and the like are reduced, and the water retaining property is enhanced; and moreover, a large dosage of iron tailings does not cause obvious influence on the strength of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete production, and in particular relates to a high-performance concrete with a large amount of iron ore tailings and a production process thereof. Background technique [0002] At present, many industrially developed countries have taken the development and utilization of mining waste as a new goal of mine development, and the comprehensive utilization and treatment of tailings as a symbol to measure a country's technological level and economic development. [0003] The tailings utilization research was carried out in foreign countries earlier. The tailings treatment technology in the United States, Russia, Canada and other countries is relatively mature, and the tailings treatment rate is relatively high. The recycling of iron ore tailings has attracted the attention of various countries. Iron ore mines in some developed countries The recycling rate of tailings has reached more than 60%, and even n...

AI Technical Summary

Problems solved by technology

[0005] 1. Some tailings comprehensive utilization technologies are not yet mature, and most of the work is still in the stage of laboratory research and development;

[0006]2. Although I have called for the comprehensive utilization of tailings resources and the improvement of human living environment, and have issued relevant laws and regulations, there are still many The mining department does not pay due attention to the utilization and treatment of tailings. They only consider immediate interests and are eager for quick success. They would rather pay environmental pollution fees than invest in the utilization and treatment of tailings.

[0007]3. Although my country has achieved a lot of research results in the utilization and treatment of mine tailings, due to the insufficient connection between industry, university and research, no organic to combine

[0008]4. Mines have little funds for scientific and technological investment, so the transfer and promotion rate of scientific research achievements is not high, and it is difficult to transform successful research with promising application prospects into actual productivity

[0009]5. The policy of encouraging the utilization of tailings resources has not yet been implemented, and the state has invested less

As far as my country's current utilization of tailings is concerned, most of them are for the extraction and recovery of useful elements, or as a substitute for sand and gravel. Due to the high cost of high-grade building material products, it is still difficult to form a scale. They are in the laboratory stage, and It is difficult for traditional building materials to form a competitive advantage

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