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Preparation method of modified waste EPS (expanded polystyrene) lightweight aggregate coated with silicate

A lightweight aggregate and silicate technology, applied in the field of building materials, can solve the problems of small bulk density, influence on workability and construction performance, water retention and other problems, and achieve the effect of tight integration

Inactive Publication Date: 2018-04-24
MAANSHAN TUORUI METAL SURFACE TECH
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AI Technical Summary

Problems solved by technology

In the freshly mixed mortar, due to the incompatibility between EPS particles and cement paste, and the bulk density is very small, it is easy to cause EPS particles to "float" during the mixing process, resulting in stratification of the mortar and a decrease in water retention, which seriously affects Its workability and construction performance

Method used

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Experimental program
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Embodiment Construction

[0018] A method for preparing silicate-coated modified waste EPS lightweight aggregate, using silane emulsion and ethylene-vinyl acetate emulsion to modify the surface of waste EPS particles, and adding fly ash, silica fume, and cement mixture at the same time, through Stirring is performed on the EPS particles for shell-making treatment to obtain modified waste EPS light aggregate.

[0019] Specific steps are as follows:

[0020] (1) The waste polystyrene foam is crushed by a special crusher to form EPS particles with a particle size of less than 5mm, which are cleaned and dried for later use;

[0021] (2) Weigh 0.08 parts of sodium dodecylsulfonate and 0.5 parts of polyethylene glycol into 20 parts of distilled water, stir for 20 minutes to mix evenly, add 8 parts of isobutyltriethoxysilane, place Stir in a water bath at 35°C for 4 hours at a constant temperature, keep the rotation speed at 2500r / min, and after fully emulsifying, let it stand for cooling to prepare a silane...

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Abstract

The invention discloses a preparation method of modified waste EPS (expanded polystyrene) lightweight aggregate coated with silicate. The preparation method comprises steps as follows: waste EPS particles are subjected to surface modification with a silane emulsion and an ethylene-vinyl acetate emulsion, meanwhile, fly ash, silica fume and a cement admixture are added, the EPS particles are subjected to shell-making treatment through blending, and the modified waste EPS lightweight aggregate is obtained. The hydrophobic EPS particle surfaces are changed to be hydrophilic, so that the EPS particles can be easily wetted when mixed with cement paste, and the EPS particles are combined with mortar more tightly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of silicate-coated modified waste EPS light aggregate. Background technique [0002] EPS is mostly for one-time use. There is a large amount of discarded EPS in my country every year. Because of the difficulty in processing and degradation, it becomes white pollution that endangers the environment. In developed countries, for the needs of environmental protection and comprehensive utilization of resources, waste EPS is processed into granules as lightweight aggregate to prepare lightweight concrete and lightweight mortar, and has been applied in engineering. [0003] The surface of EPS is hydrophobic and incompatible with silicate inorganic binders. In the freshly mixed mortar, due to the incompatibility between EPS particles and cement paste, and the bulk density is very small, it is easy to cause EPS particles to "float" during the m...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B20/10C04B16/08
CPCC04B20/1051C04B28/02C04B16/08C04B20/1037C04B20/1033C04B18/08C04B18/146
Inventor 芮明功
Owner MAANSHAN TUORUI METAL SURFACE TECH
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