| 摘要 |
The present invention comprises an aggregate for use in cementitious building materials which-successfully incorporates plastic such as recycled plastic scrap of diverse types and a abrasive, inorganic grit particles. The plastic scrap is impregnated with a grit, such as sand, glass or other inorganic material. The plastic will then bond satisfactorily with a ark cementitious binder. Impregnation is accomplished by heating the plastic in particulate form, the grit or both, then mixing the plastic and grit. The aggregate can be reinforced by the addition of metallic or artificial fibers. Optionally, the aggregate can be formed with gas filled voids by adding sodium bicarbonate or borax during the heating process or by using plastics which "off-gas" during heating. In a further option, adhesive can be added to the cementitious mix, thereby fusing plastic particles together such that a skeleton providing reinforcement or support is formed in the cured aggregate.
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