Modified and activated phosphorus slag, preparation method and modified and activated phosphorus slag cement and concrete

Abstract

The invention relates to modified and activated phosphorus slag, a preparation method and modified and activated phosphorus slag cement and concrete. The modified and activated phosphorus slag consists of an activating agent and phosphorus slag in mass ratio of (0.5-1):10; the moisture in the phosphorus slag is less than 2% of the weight of the phosphorus slag; and the activating agent consist of the following components in parts by weight: 50-70 parts of carbide slag, 0-40 parts of aluminum sulfate slag, 0-40 parts of red mud, 0-30 parts of high-aluminum fly ash, 20-30 parts of gypsum and 0-30 parts of anhydrous calcium sulphoaluminate mineral. The modified and activated phosphorus slag eliminates the influence of harmful ingredients in the phosphorus slag on the properties of cement and concrete, shortens the cement setting time and improves the cement intensity, and simultaneously improves the intensity of concrete at each age, and the drying shrinkage rate at each age is less than the drying shrinkage rate of slag powder. The activating agents used for modifying and activating the phosphorus slag are various industrial residues and do not contain chemi-excitation reagents, have no adverse effects on the service performance, endurance quality and the like of cement and concrete, enable application of high phosphorus slag content in cement and concrete, and achieve the purpose of changing waste into valuable.

Description

technical field [0001] The invention relates to a modified activated phosphorus slag, in particular to a modified activated phosphorus slag, a preparation method, modified activated phosphorus slag cement and concrete. Background technique [0002] Phosphorus slag is a good reusable resource. Its chemical composition and mineral phase composition are similar to slag. It has good potential hydraulicity, and has the characteristics of good concrete workability, strong impermeability, and large growth rate of strength in the later stage. At present, phosphorus slag has certain applications in cement-based materials, sintered hollow bricks, autoclaved hollow blocks, glass-ceramics, non-burning and non-steaming bricks, pavement base materials, rock wool, etc. However, due to the P in phosphorus slag 2 o 5 Harmful components such as phosphonium and other harmful components have a great influence on the setting and hardening of cement and the development of early strength, so its...

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Problems solved by technology

However, the current activation methods pay less attention to cement performance, rheology, drying shrinkage, corrosion resistance and other characteristics; and the use of chemical reagents is not only costly, but also has some shortcomings, such as strong alkali, basic salt and chloride salt activator , it is easy to induce concrete alkali-aggregate reaction, steel corrosion and other phenomena; sulfate activators, calcium oxide and other excitation materials will also bring certain hidden dangers to the volume stability of cement and concrete; in addition, the amount of excitation materials mixed in phosphorus slag is too high , will also have a negative impact on the hydration characteristics of phosphorus slag, such as heat of hydration, impermeability, and later strength growth rate, etc.

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