Composite plastic model sand for sediment solid model experiment and preparation method thereof

Abstract

The invention discloses composite plastic model sand for a sediment solid model experiment and a preparation method thereof, belonging to the technical field of model sand for hydraulic and harborwork sediment model experiments. The composite plastic model sand for the sediment solid model experiment comprises the following components in weight by percentage: (1) a matrix consisting of polystyrene resin and superfine active calcium carbon; and (2) a wetting agent and a coloring agent which are added in the matrix. The preparation method for the composite plastic model sand comprises the following steps of: (1) preparing raw materials; (2) preplasticizing; (3) granulating; (4) crushing; (5) shaping granules; (6) screening and classifying; and (7) washing and processing. The mechanical properties of the composite plastic model sand can meet the design requirements on various similitude ratios of the sediment solid model; in addition, the composite plastic model sand has no toxicity and pollution and can be repeatedly prepared and recycled; and the overall performances of the composite plastic model sand are obviously superior to the overall performances of the various traditional model sand.

Description

technical field [0001] The invention belongs to the technical field of model sand for hydraulic engineering and harbor engineering sediment model tests, and specifically relates to a kind of sand with adjustable physical properties, body phase hydrophilic, and various performances (including physical and motion characteristics) that can meet the requirements of solid model tests of different types of sediment. The composite plastic model sand used in the sediment model test research with similar scale design requirements, and the preparation method of the composite plastic model sand. Background technique [0002] In the prior art, the selection of model sand is a key technology in the sediment solid model test, which is directly related to the similarity of the model sediment movement and riverbed deformation and test accuracy, and is related to the success or failure of the model test. When designing a solid model, the choice of model sand needs to fully consider its physi...

AI Technical Summary

Problems solved by technology

[0003] At present, the model sand commonly used at home and abroad as a solid model of sediment can be roughly divided into three categories in terms of its formation and material composition. The first category is natural minerals, such as natural sediment, talcum powder, coal, etc. The main feature is electrochemical properties. Unstable, the model sand is ionized in water immediately after soaking, forming similar colloidal particles with negative charges on the surface, and fine particles are used to simulate suspended matter, which is easily flocculated under the influence of electrolytes in water, causing deviations in the settlement of the model sand. Except for coal and its semi-finished products, model sand generally has a higher density (greater than 2g / cm 3 ), it is not easy to meet the similar gravity requirements of the model; the second is that chemical compounds, such as bakelite powder, plastic particles, etc., are high molecular polymers, very stable, and generally have a small density, which is easy to meet the similar gravity conditions of the model, and the fine particles and water The flocculation phenomenon of the synthesized suspension is not obvious; however, this type of model sand in the prior art is broken from waste plastics, and the physical characteristics such as particle size and bulk density are fixed and cannot be adjusted artificially.

The third is plant fibers, such as wood chips, walnut shells, etc. The use of such materials as model sand is mainly due to the characteristics of its low density to meet the similar gravity, but the biggest disadvantage is that because it is organic matter, it contains organic oil, which is easy to Rotting and deterioration, volume expansion after absorbing water, short shelf life, degreasing and antiseptic treatment before application

The different types of model sand mentioned above have been applied to varying degrees in large-scale water conservancy projects and solid model tests of river and lake governance, and many achievements and experiences have been obtained. However, they also have various shortcomings, the biggest defect of which is the existing Model sand has some problems that limit its application. The prominent performance is that the physical characteristics of model sand such as particle size and bulk density are fixed and cannot be adjusted artificially. In order to meet the requirements of a certain characteristic of model sand, the model design often deviates from some similar conditions, giving the model The design brings many restrictions, which will directly affect the quality of model test results