Preparation method of novel core-shell type cement-based high-strength lightweight aggregate

Abstract

The invention provides a preparation method of novel core-shell type cement-based high-strength lightweight aggregate. A cement-based composite material (cement and an admixture) is used as a main cementing material of a shell material, a pelletizing process is adopted for surrounding a shell outside a lightweight core material, and the high-strength lightweight aggregate can be successfully prepared after curing is performed for a certain period of time. The prepared light aggregate has the advantages of high specific strength, good grain shape and good heat preservation and heat insulation, and can realize certain specific functions, such as heat storage, sound insulation and wave absorption. A production process of the high-strength light aggregate comprises the steps of mixing powder, uniformly stirring, spraying liquid to form pellets, curing (steam curing and moisturizing) and screening. According to the preparation method, the problems of great production energy consumption, complex process and serious pollution of the aggregate produced by a traditional sintering process or the problems of relatively large packing density, insufficiently high strength and insufficiently high product quality of unburned ceramsite products are solved.

Description

technical field [0001] The invention belongs to the field of building materials and can also be used for other engineering materials, and in particular relates to a preparation method of high-strength lightweight aggregate. Background technique [0002] The current lightweight aggregates are mainly ceramsite. my country began to develop artificial lightweight aggregates from the 1960s, mainly clay ceramsite, shale ceramsite and fly ash ceramsite. The traditional production process uses clay, shale, etc. as raw materials, and adopts the high-temperature sintering technology of the rotary kiln, which has high energy consumption, poor production environment, backward technology, and low output, and the single load capacity is generally low, only 80N~200N . [0003] According to the national energy saving policy, the preparation technology of ceramsite has also been developed, which is mainly reflected in the selection of raw materials and production technology. In order to re...

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Problems solved by technology

In terms of production technology, there is also the development of energy-saving unfired ceramsite technology, but the existing unburned fly ash lightweight aggregate has a high bulk density, generally 600kg / m 3 ~800kg / m 3 The strength of the particles is not high. When the particle size is 5mm-10mm, the bearing capacity of a single particle is only 80N-200N; the thermal insulation effect is not obvious, it is easy to carbonize, and the corrosion resistance of steel bars is poor, so it is difficult to apply in large-scale structural engineering and steel bar structures. It is mainly used in small blocks and plates, which limits its development scale

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