Compound of quick-setting rapid-hardening cement material and preparation method thereof

Abstract

The invention discloses a compound of a quick-setting rapid-hardening cement material. The compound is prepared by mixing main materials, accessory materials, additives and aggregate by mass, whereinthe main materials include 750 kg of ordinary Portland cement No. 42.5 and 250 kg of low-alkalinity sulfoaluminate cement No. 42.5; the accessory materials include 25 kg of heavy calcium carbonate, 8kg of natural anhydrous anhydrite, 16 kg of calcium oxide, 2.5 kg of silica fume and 27.5 kg of bauxite clinker; the additives consist of 8 kg of soda ash (sodium carbonate) and 1.5 kg of a polycarboxylate superplasticizer; and the aggregate is washed graded baked sand with a size of 60 to 120 meshes. The invention also provides a preparation method for the compound. The preparation method comprises the following steps: (1) successively adding the above raw materials with the desired mass fractions into a mixer for forced stirring for 30 min; and (2) carrying out discharging and filling. According to the invention, usage cost is reduced; the comprehensive performance of the ordinary Portland cement and the sulfoaluminate cement is improved; the demands of special projects for quick settingand rapid hardening are met; and the compound has good practicality, great market demands and good prospects.

Description

Technical field [0001] The invention relates to the field of cement preparation, in particular to a method for preparing a fast-setting and fast-hardening cement material. Background technique [0002] Quick-setting cement is produced with the widespread use of cement concrete and has been continuously developed. Used in sprayed concrete, it can greatly increase the speed and thickness of spraying, while increasing the strength and reducing the rebound. Quick-setting cement allows concrete to set soon after being sprayed on the work surface. Therefore, quick-setting cement must have the following properties: (1) It has high early strength, and the later strength cannot be reduced too much; (2) The concrete should be initially set within 3 to 5 minutes after spraying, and final set within 12 minutes; (3) Reduce the water-cement ratio as much as possible to prevent excessive shrinkage and improve the impermeability; (4) No adverse effects on construction personnel and the environ...

AI Technical Summary

Problems solved by technology

However, the current sulphoaluminate cement has the disadvantages of late strength shrinkage, high production costs, high energy consumption, and high transportation costs.

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