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A platform for research: civil engineering, architecture and urbanism
Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate
The invention belongs to the technical field of concrete aggregates, and particularly relates to a concrete aggregate with a core-shell structure as well as a preparation method and application thereof. The invention provides concrete aggregate with a core-shell structure. The concrete aggregate comprises an inner core and an outer shell wrapping the inner core, the inner core is prepared from dangerous solid waste powder and water; the shell is prepared from the following raw materials: Portland cement, silica fume, a polycarboxylate superplasticizer and water. According to the invention, the preparation raw materials of the inner core preliminarily form a stable consolidated body; the shell composition can be subjected to pozzolanic reaction with active components in the dangerous solid waste in the inner core, the microstructure of an interface transition area is improved, tight combination of the inner core and the shell is promoted, the dangerous solid waste is stably sealed in the shell, and surface leaching of heavy metal ions is effectively prevented; in addition, the shell composition is large in early-stage shrinkage and can play a physical compaction role, the mechanical strength of the core-shell structure concrete aggregate is further improved, and high-quality aggregate preparation is achieved.
本发明属于混凝土骨料技术领域，特别涉及一种核壳结构混凝土骨料及其制备方法和应用。本发明提供了一种核壳结构混凝土骨料，包括内核和包裹所述内核的外壳；所述内核的制备原料包括：危险固废粉和水；所述外壳的制备原料包括：硅酸盐水泥、硅灰、聚羧酸减水剂和水。在本发明中，内核的制备原料初步形成稳定固结体；外壳组成能与内核中的危险固废中活性组分发生火山灰反应，改善界面过渡区微结构，促进内核和外壳紧密结合，实现危险固废稳定固封在外壳内部，有效防止重金属离子的表面浸出；此外，外壳组成早期收缩大，能起到物理压实作用，进一步提升核壳结构混凝土骨料的力学强度，实现高质量骨料制备。
Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate
The invention belongs to the technical field of concrete aggregates, and particularly relates to a concrete aggregate with a core-shell structure as well as a preparation method and application thereof. The invention provides concrete aggregate with a core-shell structure. The concrete aggregate comprises an inner core and an outer shell wrapping the inner core, the inner core is prepared from dangerous solid waste powder and water; the shell is prepared from the following raw materials: Portland cement, silica fume, a polycarboxylate superplasticizer and water. According to the invention, the preparation raw materials of the inner core preliminarily form a stable consolidated body; the shell composition can be subjected to pozzolanic reaction with active components in the dangerous solid waste in the inner core, the microstructure of an interface transition area is improved, tight combination of the inner core and the shell is promoted, the dangerous solid waste is stably sealed in the shell, and surface leaching of heavy metal ions is effectively prevented; in addition, the shell composition is large in early-stage shrinkage and can play a physical compaction role, the mechanical strength of the core-shell structure concrete aggregate is further improved, and high-quality aggregate preparation is achieved.
本发明属于混凝土骨料技术领域，特别涉及一种核壳结构混凝土骨料及其制备方法和应用。本发明提供了一种核壳结构混凝土骨料，包括内核和包裹所述内核的外壳；所述内核的制备原料包括：危险固废粉和水；所述外壳的制备原料包括：硅酸盐水泥、硅灰、聚羧酸减水剂和水。在本发明中，内核的制备原料初步形成稳定固结体；外壳组成能与内核中的危险固废中活性组分发生火山灰反应，改善界面过渡区微结构，促进内核和外壳紧密结合，实现危险固废稳定固封在外壳内部，有效防止重金属离子的表面浸出；此外，外壳组成早期收缩大，能起到物理压实作用，进一步提升核壳结构混凝土骨料的力学强度，实现高质量骨料制备。
Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate
一种核壳结构混凝土骨料及其制备方法和应用
HOU DONGSHUAI (author) / WANG XINPENG (author) / LI MENGMENG (author) / WU DI (author) / LI GUANNAN (author)
2022-06-21
Patent
Electronic Resource
Chinese
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