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A platform for research: civil engineering, architecture and urbanism
Process for preparing recycled coarse aggregate from construction waste
The invention belongs to the technical field of building materials, and particularly relates to a process for preparing recycled coarse aggregate from building waste, which comprises the steps of crushing, magnetic separation for impurity removal, dust removal, mixing and stirring, chemical reaction and heating and drying. According to the method, the recycled coarse aggregate particles and the Ca (OH) 2 powder are firstly mixed, so that cracks are filled with the Ca (OH) 2 powder, then the Ca (OH) 2 powder reacts with the H2CO3 solution to produce the CaCO3 precipitate, the cracks are tamped and repaired through the CaCO3 precipitate, the compressive strength of the recycled aggregate particles is improved, and the application range of the recycled aggregate is widened; meanwhile, the water absorption rate of the repaired recycled coarse aggregate is reduced, so that the situation that the splitting strength of concrete configured by recycled coarse aggregate particles is reduced and the drying shrinkage is aggravated due to porosity of a microstructure in an interface area possibly caused by a large amount of water loss or too thick water film around the recycled aggregate concrete aggregate is avoided.
发明属于建筑材料技术领域，具体的说是一种建筑垃圾制备再生粗骨料的工艺，包括破碎、磁选除杂、除尘、混合搅拌、化学反应和加热烘干；本发明通过再生粗骨料颗粒与Ca(OH)2粉末率先进行混合，使得Ca(OH)2粉末填满裂缝，随后与H2CO3溶液进行反应，生产CaCO3沉淀，通过CaCO3沉淀对裂缝进行填实修复，提高再生骨料颗粒的抗压强度，提高再生出骨料所适用的范围；同时修复后的再生粗骨料的吸水率降低，避免了再生骨料混凝土骨料的周围可能因为大量失水或因水膜过厚而造成界面区微结构的多孔性，导致再生粗骨料颗粒配置的混凝土劈裂强度的降低和干缩加剧。
Process for preparing recycled coarse aggregate from construction waste
The invention belongs to the technical field of building materials, and particularly relates to a process for preparing recycled coarse aggregate from building waste, which comprises the steps of crushing, magnetic separation for impurity removal, dust removal, mixing and stirring, chemical reaction and heating and drying. According to the method, the recycled coarse aggregate particles and the Ca (OH) 2 powder are firstly mixed, so that cracks are filled with the Ca (OH) 2 powder, then the Ca (OH) 2 powder reacts with the H2CO3 solution to produce the CaCO3 precipitate, the cracks are tamped and repaired through the CaCO3 precipitate, the compressive strength of the recycled aggregate particles is improved, and the application range of the recycled aggregate is widened; meanwhile, the water absorption rate of the repaired recycled coarse aggregate is reduced, so that the situation that the splitting strength of concrete configured by recycled coarse aggregate particles is reduced and the drying shrinkage is aggravated due to porosity of a microstructure in an interface area possibly caused by a large amount of water loss or too thick water film around the recycled aggregate concrete aggregate is avoided.
发明属于建筑材料技术领域，具体的说是一种建筑垃圾制备再生粗骨料的工艺，包括破碎、磁选除杂、除尘、混合搅拌、化学反应和加热烘干；本发明通过再生粗骨料颗粒与Ca(OH)2粉末率先进行混合，使得Ca(OH)2粉末填满裂缝，随后与H2CO3溶液进行反应，生产CaCO3沉淀，通过CaCO3沉淀对裂缝进行填实修复，提高再生骨料颗粒的抗压强度，提高再生出骨料所适用的范围；同时修复后的再生粗骨料的吸水率降低，避免了再生骨料混凝土骨料的周围可能因为大量失水或因水膜过厚而造成界面区微结构的多孔性，导致再生粗骨料颗粒配置的混凝土劈裂强度的降低和干缩加剧。
Process for preparing recycled coarse aggregate from construction waste
一种建筑垃圾制备再生粗骨料的工艺
LU RONGHU (author) / HAN WENFEI (author) / RONG YI (author)
2024-05-17
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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