|Table of Contents|

Hydration Dormancy and Recovery of Waste Fresh Concrete and Recycling(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年03期
Page:
70-79
Research Field:
Publishing date:

Info

Title:
Hydration Dormancy and Recovery of Waste Fresh Concrete and Recycling
Author(s):
XIAO Jian-zhuang1;  ZHU Ji-dong1; 2;  ZHU Min-tao2;  YI Zhuo-ran1
(1.College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai Construction Materials Engineering Co., Ltd., Shanghai 200086, China)
Keywords:
waste fresh concrete;  hydration dormancy;  hydration recovery;  recycling;  mechanical property
PACS:
TU375
DOI:
10.19815/j.jace.2020.10041
Abstract:
Aiming at the reasonable recycling of waste fresh concrete in commercial concrete plant being always limited by setting time, the hydration reaction of waste fresh concrete was delayed to near stagnation by adding hydration-inhibitor agent, then to make the hydration of waste fresh concrete return to normal by adding hydration-recovery agent and additional water-reducing agent at appropriate time. After that waste fresh concrete can replace fresh concrete according to a certain replacement ratio to recycling. These measures extended the treatment time of waste fresh concrete and made the recycling of waste fresh concrete more flexible. By analyzing the recycling of waste fresh concrete, the change rules of slump, setting time and compressive strength of recycled fresh concrete were obtained. The results show that the dormancy-recovery treatment of waste fresh concrete can be determined through the study of composite cementitious material paste. Taking proper dormancy measures can extend the treatment time of waste fresh concrete to 48 h. If recovery treatment is not used, the long dormant waste fresh concrete can not be used directly. In the process of recycling, with the increase of replacement ratio, the initial setting time and final setting time of recycled fresh concrete gradually increase, the maximum increase range of initial setting time is 95 min, and the maximum increase range of final setting time is 80 min. In addition to the dormancy time of 12 h, the replacement ratio of 50% and 100%, the slump loss is better than the reference sample. The compressive strength of recycled fresh concrete tends to decrease, the reduction range of 7 d compressive strength is between 12% and 14%, the reduction range of 28 d compressive strength is between 7% and 10%, the reduction range of 56 d compressive strength is between 4% and 6%.

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Last Update: 2021-05-20