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Modification method and application of recycled concrete aggregate
The invention provides a modification method and application of recycled concrete aggregate, the modification method comprises pretreatment, surface treatment and repair, in the pretreatment process, preheating and microwave heat treatment are combined to preliminarily modify waste, moisture in the aggregate is removed, ion exchange reaction in the aggregate is activated, and the surface of the aggregate is repaired; the strength and durability of the recycled aggregate are favorably improved; a surface treating agent and laser irradiation are adopted, so that a surface active agent permeates into the aggregate to improve the performance of the aggregate, a specific compound bacteria solution is selected, calcium ions and silicate ions can be effectively secreted and react with substances on the surface of the recycled aggregate, a new mineral phase is formed, the internal structure of the recycled aggregate is changed, and a good filling effect is achieved; the density of the aggregate is effectively improved, the apparent density of the modified aggregate is 2.2-2.5 kg/m < 3 >, the bulk density is 1.40-1.47 kg/m < 3 >, the water absorption rate is 3.26-4.18%, the porosity of the modified aggregate is 1.6-2.9% when the particle size is larger than 200nm, and the crushing index is 12.5-13.4; the method disclosed by the invention is beneficial to improving the utilization rate of the recycled aggregate, is environment-friendly and has a good popularization prospect and application value.
本发明提供一种再生混凝土骨料的改性方法及其应用，改性方法包括预处理、表面处理和修复，预处理过程中采用预热和微波热处理联合对废料进行初步改性，去除骨料中的水分，激活骨料中的离子交换反应，有利于提高再生骨料的强度和耐久性；采用表面处理剂和激光照射，使表面活性剂渗透到骨料内部，改善骨料性能，选择特定的复合菌液，能有效分泌出钙离子和硅酸根离子，与再生骨料表面的物质发生反应，形成新的矿物相，改变其内部结构，具有良好的填充作用，有效提高骨料密实度，改性骨料表观密度为2.2‑2.5kg/m3，堆积密度为1.40‑1.47kg/m3，吸水率为3.26‑4.18％，大于200nm孔隙率为1.6‑2.9％，压碎指标为12.5‑13.4；本发明方法有利于提高再生骨料的利用率，环境友好且具备良好的推广前景及应用价值。
Modification method and application of recycled concrete aggregate
The invention provides a modification method and application of recycled concrete aggregate, the modification method comprises pretreatment, surface treatment and repair, in the pretreatment process, preheating and microwave heat treatment are combined to preliminarily modify waste, moisture in the aggregate is removed, ion exchange reaction in the aggregate is activated, and the surface of the aggregate is repaired; the strength and durability of the recycled aggregate are favorably improved; a surface treating agent and laser irradiation are adopted, so that a surface active agent permeates into the aggregate to improve the performance of the aggregate, a specific compound bacteria solution is selected, calcium ions and silicate ions can be effectively secreted and react with substances on the surface of the recycled aggregate, a new mineral phase is formed, the internal structure of the recycled aggregate is changed, and a good filling effect is achieved; the density of the aggregate is effectively improved, the apparent density of the modified aggregate is 2.2-2.5 kg/m < 3 >, the bulk density is 1.40-1.47 kg/m < 3 >, the water absorption rate is 3.26-4.18%, the porosity of the modified aggregate is 1.6-2.9% when the particle size is larger than 200nm, and the crushing index is 12.5-13.4; the method disclosed by the invention is beneficial to improving the utilization rate of the recycled aggregate, is environment-friendly and has a good popularization prospect and application value.
本发明提供一种再生混凝土骨料的改性方法及其应用，改性方法包括预处理、表面处理和修复，预处理过程中采用预热和微波热处理联合对废料进行初步改性，去除骨料中的水分，激活骨料中的离子交换反应，有利于提高再生骨料的强度和耐久性；采用表面处理剂和激光照射，使表面活性剂渗透到骨料内部，改善骨料性能，选择特定的复合菌液，能有效分泌出钙离子和硅酸根离子，与再生骨料表面的物质发生反应，形成新的矿物相，改变其内部结构，具有良好的填充作用，有效提高骨料密实度，改性骨料表观密度为2.2‑2.5kg/m3，堆积密度为1.40‑1.47kg/m3，吸水率为3.26‑4.18％，大于200nm孔隙率为1.6‑2.9％，压碎指标为12.5‑13.4；本发明方法有利于提高再生骨料的利用率，环境友好且具备良好的推广前景及应用价值。
Modification method and application of recycled concrete aggregate
一种再生混凝土骨料的改性方法及其应用
HAN WOO-YOUNG (author) / HAN SHIJIE (author) / FU XIAOBO (author) / HE CHENG'AI (author) / HAN QING (author)
2024-03-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Surface modification strengthening method for waste concrete recycled aggregate
| European Patent Office | 2020
| European Patent Office | 2023
British Library Online Contents | 2005