High strength concrete adopting desulfurized gypsum as activator, and preparation method thereof

Abstract

The invention relates to high strength concrete adopting desulfurized gypsum as an activator, and a preparation method thereof. The high strength concrete comprises cement, fly ash, slag powder, activated coal gangue, metakaolin, desulfurized gypsum, slaked lime, sucrose ester, machine-made sand, crushed stone, a polycarboxylate superplasticizer and water according to a formula. According to the present invention, the utilization ratio of various industrial wastes by the concrete can be effectively improved, the use amount of the cement is low, and the penetration resistance, the carbonization resistance and the C1-penetration resistance of the concrete are easily improved; the significant advantages of low cost, high greening degree, carbon discharge reducing and the like are provided. The high strength concrete of the present invention is applicable for constructions of pillars of various buildings, piers and box girders of viaducts, and piers and main towers of sea-crossing bridges, and is further suitable for constructions of high strength filling piles, steel pipe concrete pillars (arches), steel-concrete combination structures, and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-strength concrete using desulfurized gypsum as an activator and a preparation method thereof. Background technique [0002] With the rapid increase in the construction of high-rise buildings, high-speed rail transit and long-span bridges in my country, the demand for high-strength concrete is increasing. According to relevant specifications, concrete with compressive strength grade C60 and above is high-strength concrete. According to statistics, before 2000, the proportion of high-strength concrete in various projects in our country did not exceed 2%, but today, 10 years later, high-strength concrete accounts for almost 6% of the total concrete consumption. In actual engineering, the preparation of high-strength concrete is a very complicated task, which is affected by many factors such as cement strength grade, type and quality of admixture, type ...

AI Technical Summary

Problems solved by technology

At present, the two revisions of the cement standard have led to the continuous increase of the specific surface area of ​​the cement supplied in the market, the poor adaptability to the water reducer, and the unsatisfactory development of the strength of the prepared concrete in the later stage, coupled with the depletion of high-quality river sand resources. The preparation, actual production and application bring great technical difficulties. Therefore, the research on using local materials to prepare high-strength concrete with excellent mechanical properties and durability is in the ascendant.

[0003] In the "Eleventh Five-Year" environmental plan, the country has increased investment in flue gas desulfurization projects in large coal-fired enterprises, and the efficient use of desulfurization gypsum, an industrial by-product, has attracted widespread attention. If it is not handled properly, flue gas desulfurization projects will only transform The form of pollution has been changed, and the pollution of sulfur dioxide has not been fundamentally solved, and stacking will pollute land and water sources more seriously