Preparation method of recycled cementing material

Abstract

The invention discloses a preparation method of a recycled cementing material, which comprises the following steps: (1) homogenizing waste calcareous powder and waste clay powder to obtain mixed powder; (2) carrying out heat treatment on the mixed powder to obtain activated mixed powder; and (3) uniformly mixing the activated mixed powder with an excitant to obtain the recycled cementing material.The preparation process of the recycled cementing material provided by the invention is simple, and the prepared recycled cementing material can replace cement and other traditional mineral admixtures, is directly used for preparing concrete or other cement-based materials, and has no influence on the compressive strength of the concrete or other cement-based materials. The method not only solvesthe problems of large stacking amount of waste concrete and harm to the environment at the present stage, but also solves the problem of insufficient high-quality clay resources, has good industrialvalue, provides a new thought for large-scale consumption of building solid wastes for preparation of mineral admixtures in the future, and has remarkable social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of recycled gelling materials. Background technique [0002] With the continuous improvement of urbanization in large and medium-sized cities in my country, a large number of urban public and civil buildings and municipal infrastructure are facing the demand for new construction, demolition, decoration and renovation, and the discharge of construction solid waste in my country has increased sharply. In addition, the amount of solid waste (such as coal gangue, discarded clay, ceramic waste, etc.) discharged by industries such as metallurgy, chemical industry, coal, and electric power in my country is also increasing year by year. The massive accumulation of these construction solid wastes not only occupies a large amount of land resources, but also causes serious water pollution and dust pollution, and even causes traffic hazards and saf...

AI Technical Summary

Problems solved by technology

The accumulation of these construction solid wastes not only occupies a large amount of land resources, but also causes serious water pollution and dust pollution, and even causes traffic hazards and safety accidents.

[0003] In the past, the disposal methods of construction solid waste in my country were relatively rough and simple, which caused serious environmental pollution and social problems.

Compared with the resource utilization rate of construction solid waste in developed countries, which has reached over 90%, the resource utilization rate of construction solid waste in my country is relatively low (some data show that it is less than 10%)

However, aggregates obtained after crushing, cleaning, and grading of waste concrete generally have a high proportion of old mortar attached, and these recycled aggregates are slightly worse than natural bone in terms of crushing value, mud content, water absorption and other physical performance indicators. material

Therefore, most of the existing recycled aggregates are used as roadbed cushion materials, and the industrial added value is low

In addition, the recycled powder obtained after crushing waste concrete has irregular particle shape distribution, large specific surface area, and less hydratable substances. limited

Excessive dosage will easily cause the water demand of cement-based material mixture to increase, the microstructure of cement-based materials will become looser, the compressive and flexural strength will decrease, and the frost resistance will decrease significantly.

At present, when waste concrete is used, there is no activation treatment for concrete, the proportion of waste concrete powder to be absorbed is low, and the cost of prepared concrete is high, which is not conducive to large-scale application; although some treatment methods have activated concrete , but it needs to be processed at a temperature as high as 1350 ° C, the process is complicated, the temperature is high, the difficulty is large, and the energy consumption is high

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