A kind of construction waste regenerated highly active mineral admixture and its preparation

Abstract

The invention discloses a regenerated high-activity mineral admixture prepared through resourceful utilization of construction waste and metallurgical waste residue, and a preparation method thereof. The method comprises the following steps: crushing waste concrete so as to obtain cement stone flour; mixing 70 to 98 wt% of cement stone flour, 0 to 25 wt% of metallurgical waste residue and 1 to 5 wt% of floating beads, adding water accounting for 10 to 15% of the total mass of cement stone flour, siliceous metallurgical waste residue and floating beads into the obtained mixture and carrying out drying so as to obtain slag stone flour; calcining the obtained slag stone flour at a temperature of 800 to 1000 DEG C for 15 to 20 min so as to obtain calcined slag stone flour; and mixing 50 to 70 wt% of calcined slag stone flour and 30 to 50 wt% of blast furnace slag powder so as to obtain the regenerated high-activity mineral admixture. According to the invention, solid waste like construction waste, metallurgical waste residue, floating beads and the like is used, so components of the mineral admixture are simple and manufacturing cost is low; and the mineral admixture has high activity and can effectively reduce the amount of cement in preparation of high performance concrete.

Description

technical field

[0001] The invention belongs to the category of inorganic non-metallic building materials, and in particular relates to a preparation method of a regenerated high-activity mineral admixture for resource utilization of construction waste and metallurgical waste slag Background technique

[0002] The traditional cement industry is an industry with huge energy and resource consumption and serious environmental load. It is very important to develop new auxiliary cementitious materials, which can replace some cement to a certain extent and reduce cement production, thereby reducing energy, resource consumption and environmental load. meaning. At the same time, industries such as metallurgy, ceramics, electroplating, and batteries produce a large amount of industrial waste slag every year. The random stacking of these waste slags takes up a lot of valuable land resources. At the same time, some heavy metals in them are easy to cause secondary pollution to the envir...

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