A kind of preparation method of core-shell cement-based high-strength lightweight aggregate

Abstract

The invention provides a method for preparing a novel core-shell cement-based high-strength lightweight aggregate, which uses cement-based composite materials (cement and admixtures) as the main gelling material of the shell material, adopts a ball forming process, The core material is surrounded by a shell, and after a certain amount of maintenance, high-strength lightweight aggregate can be successfully prepared. The prepared lightweight aggregate has high specific strength, good particle shape, good thermal insulation, and can realize certain specific functions, such as heat storage, sound insulation, and wave absorption. The production process of the high-strength lightweight aggregate is: powder mixing→stirring evenly→spraying liquid into balls→curing (steam curing+moisturizing)→sieving. The invention solves the problems of high energy consumption, complex process and serious pollution in aggregate production produced by the traditional sintering process, or the problems of high bulk density and insufficient strength of unfired ceramsite products and insufficient product quality.

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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