Recycling of sewage sludge ash in cold-bonded artificial lightweight aggregate for sustainable lightweight concrete

被引：0
作者：
Jiang, Junsong [1 ]
Zhou, Xianliang L. [1 ]
Zheng, Yantao T. [2 ,3 ]
Wu, Ping [1 ]
Jiang, Guichuan [3 ]
Jian, Bingxi [3 ]
机构：
[1] Xihua Univ, Inst Architecture & Civil Engn, Chengdu 610097, Peoples R China
[2] Guizhou Chengqian Grp Co LTD, Guiyang 550001, Peoples R China
[3] Guizhou Xifeng Phosphate Mine Co LTD, Guiyang 551108, Peoples R China
来源：
SCIENTIFIC REPORTS | 2025年 / 15卷 / 01期
关键词：
Sewage sludge ash; Cold-bonded technology; Lightweight aggregate concrete; Drying shrinkage; Freeze-thaw cycles; PERVIOUS CONCRETE; FROST-RESISTANCE; DRYING SHRINKAGE; HEAVY-METALS; FLY-ASH; WASTE; MANUFACTURE;
D O I：
10.1038/s41598-025-13133-w
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The cold bonding technology for producing lightweight aggregates has received significant international attention in the fields of waste treatment and the production of green building materials. In this study, sustainable lightweight aggregate concrete (LAC) is prepared by partially replacing natural coarse aggregate with cold-bonded sewage sludge ash lightweight aggregate. The properties and microscopic characteristics of concrete were studied. The results show that the density and compressive strength of LAC decreased to 1645 kg/m(3) and 12.83 MPa when the replacement rate of lightweight aggregates from 0 to 100%, indicating that the LAC can be used for non-structural LAC. Structural LAC can also be designed when 75% lightweight aggregates and 25% natural coarse aggregate are used simultaneously. In addition, the results of Scanning Electron Microscope and Nuclear Magnetic Resonance show that high lightweight aggregate content is accompanied by higher porosity and pore size inside the LAC, which reduces the resistance of concrete to drying shrinkage and freeze-thaw cycles. This research provides theoretical support for the application of SSA in sustainable LAC and reducing the damage of SSA to the environment.
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页数：13
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