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A platform for research: civil engineering, architecture and urbanism
Method for preparing recycled aggregate from waste freshly mixed concrete
The invention discloses a method for preparing recycled aggregate by using waste freshly mixed concrete, which comprises the following steps: (1) adding polyacrylamide into the freshly mixed concrete, and stirring for 4-7 minutes at the speed of 15-20 r/min; wherein the use amount of the polyacrylamide is 0.04%-0.05% of the mass of the freshly mixed concrete; (2) adding sodium metaaluminate into the freshly mixed concrete, and stirring for 10-15 minutes at the speed of 15-20 r/min; wherein the use amount of the sodium metaaluminate is 0.2%-0.3% of the mass of the freshly mixed concrete; and (3) spreading the stirred fresh concrete on a dry site, and airing for 4-6 hours to obtain the recycled aggregate. According to the method for preparing the recycled aggregate by using the waste fresh concrete, the polyacrylamide and the sodium metaaluminate are doped into the waste fresh concrete, the recycled aggregate with low water absorption, large apparent density and small crushing value can be obtained within 4-6 hours, the operation is simple, and the treatment cost of a mixing plant is greatly saved.
本发明公开了一种利用废弃新拌混凝土制备再生骨料的方法，包括以下步骤：(1)向新拌混凝土中掺入聚丙烯酰胺，以15～20r/min搅拌4～7分钟；其中聚丙烯酰胺的用量为新拌混凝土质量的0.04％～0.05％；(2)向新拌混凝土中掺入偏铝酸钠，以15～20r/min搅拌10～15分钟；其中偏铝酸钠的用量为新拌混凝土质量的0.2％～0.3％；(3)将搅拌后的新拌混凝土平铺在干燥的场地上晾4～6个小时后，得到再生骨料。本发明的一种利用废弃新拌混凝土制备再生骨料的方法，通过在废弃新拌混凝土中掺入聚丙烯酰胺和偏铝酸钠，在4～6个小时内即可获得吸水率低、表观密度大、压碎值小的再生骨料，操作简单、大大节约了搅拌站的处理成本。
Method for preparing recycled aggregate from waste freshly mixed concrete
The invention discloses a method for preparing recycled aggregate by using waste freshly mixed concrete, which comprises the following steps: (1) adding polyacrylamide into the freshly mixed concrete, and stirring for 4-7 minutes at the speed of 15-20 r/min; wherein the use amount of the polyacrylamide is 0.04%-0.05% of the mass of the freshly mixed concrete; (2) adding sodium metaaluminate into the freshly mixed concrete, and stirring for 10-15 minutes at the speed of 15-20 r/min; wherein the use amount of the sodium metaaluminate is 0.2%-0.3% of the mass of the freshly mixed concrete; and (3) spreading the stirred fresh concrete on a dry site, and airing for 4-6 hours to obtain the recycled aggregate. According to the method for preparing the recycled aggregate by using the waste fresh concrete, the polyacrylamide and the sodium metaaluminate are doped into the waste fresh concrete, the recycled aggregate with low water absorption, large apparent density and small crushing value can be obtained within 4-6 hours, the operation is simple, and the treatment cost of a mixing plant is greatly saved.
本发明公开了一种利用废弃新拌混凝土制备再生骨料的方法，包括以下步骤：(1)向新拌混凝土中掺入聚丙烯酰胺，以15～20r/min搅拌4～7分钟；其中聚丙烯酰胺的用量为新拌混凝土质量的0.04％～0.05％；(2)向新拌混凝土中掺入偏铝酸钠，以15～20r/min搅拌10～15分钟；其中偏铝酸钠的用量为新拌混凝土质量的0.2％～0.3％；(3)将搅拌后的新拌混凝土平铺在干燥的场地上晾4～6个小时后，得到再生骨料。本发明的一种利用废弃新拌混凝土制备再生骨料的方法，通过在废弃新拌混凝土中掺入聚丙烯酰胺和偏铝酸钠，在4～6个小时内即可获得吸水率低、表观密度大、压碎值小的再生骨料，操作简单、大大节约了搅拌站的处理成本。
Method for preparing recycled aggregate from waste freshly mixed concrete
一种利用废弃新拌混凝土制备再生骨料的方法
CAO WEIDA (author) / HUANG JIABAO (author) / SUN YUANSONG (author) / ZHANG WEI (author) / DENG YI (author) / JIANG LIN (author)
2023-11-10
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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