Non-shrinkage cementing material made of phosphogypsum and preparation method of non-shrinkage cementing material and concrete

Abstract

The invention relates to the technical field of comprehensive utilization of phosphogypsum, in particular to a non-shrinkage cementing material made of the phosphogypsum and a preparation method of the non-shrinkage cementing material and concrete. The phosphogypsum, coal ash or phosphorous slag, water quenching slag and steel slag are compounded to form a mixed material, the non-shrinkage cementing material is prepared by adding ordinary Portland cement, high-value comprehensive utilization of the phosphogypsum is achieved, sulfate in the phosphogypsum is used as an activator to activate theactivity of the coal ash, the phosphorous slag, the water quenching slag, the steel slag and the like, and reacts with the coal ash, the phosphorous slag, the water quenching slag, the steel slag, Al2O3 in the cement and hydrated product of the cement Ca(OH)2 to form ettringite Aft, capillary pore in the concrete is filled and blocked, the quality percentage control of raw materials is combined, the performance of the cementing material is improved, thus when the cementing material is applied to the concrete, the compactness of the concrete is improved, volume expansion is generated, the non-shrinkage high-performance concrete is obtained, at the same time, the hydration heat of the cement is lowered, cement consumption is saved, and the production cost of the concrete is lowered.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of phosphogypsum, in particular to a non-shrinkage cementitious material made of phosphogypsum, a preparation method thereof and concrete. Background technique [0002] Phosphogypsum is a solid waste produced by decomposing phosphate rock with sulfuric acid and filtering to produce phosphoric acid in the production process of wet-process phosphoric acid. For every ton of wet-process phosphoric acid produced, about 4-5 tons of phosphogypsum will be discharged. Phosphogypsum is in powder form, the main phase composition is calcium sulfate dihydrate, containing a small amount of quartz; the main chemical components are calcium oxide, sulfur trioxide, silicon dioxide, phosphorus pentoxide, fluorine ions, etc.; The content of gypsum is generally above 90%. According to relevant statistics, the global discharge of phosphogypsum has reached 150 million tons, while the discharge of phos...

AI Technical Summary

Problems solved by technology

However, due to the inappropriate use of phosphogypsum in the prior art and the inappropriate control of the ratio of raw materials in the cementitious material, the resulting cementitious material has poor performance and unsatisfactory shrinkage performance, which leads to the application of the cementitious material to the preparation of concrete and other products. During the process, the quality of the concrete product is poor, especially the shrinkage deformation value is relatively large

Images