Recycling of water treatment sludge in concrete: The role of water-binder ratio from a nanoscale perspective

被引:7
|
作者
He, Zhi-Hai [1 ,2 ]
Han, Xu-Dong [1 ]
Jin, Jia-xu [3 ]
Li, Jiang-shan [4 ]
Tang, Wei [5 ]
Shi, Jin-yan [6 ]
机构
[1] Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China
[2] Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China
[3] Liaoning Tech Univ, Sch Civil Engn, Fuxin 123000, Liaoning, Peoples R China
[4] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
[5] Shaoxing Vocat & Tech Coll, Dept Architecture & Design Art, Shaoxing 312000, Peoples R China
[6] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
基金
中国国家自然科学基金;
关键词
Concrete; Drinking water sludge ash; Water-binder ratio; Microstructure; Nanoscale; ALGOGENIC ORGANIC-MATTER; TO-CEMENT RATIO; C-S-H; ALUM SLUDGE; POTASSIUM-PERMANGANATE; HYDRATION KINETICS; STRENGTH; BEHAVIOR; WASTE; COAGULATION;
D O I
10.1016/j.scitotenv.2023.162456
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
For eutrophic water bodies, potassium permanganate is an effective pre-oxidant to remove algae and its residue in water treatment sludge. Recycling water treatment sludge in concrete is an environmentally friendly and high-value utilization measure. However, little research has been done on the effect of manganese-rich drinking water sludge ash (DWSA) on concrete. The effect of water-binder ratio (w/b) on strength, shrinkage and microstructural character-istics of concrete containing DWSA was investigated, and the structural behavior was explained from a nanoscale per-spective. The results show that recycling 10 % DWSA in concrete improved the strength and shrinkage resistance of the samples. Reducing the w/b effectively increased the strength of DWSA-modified concrete and reduced the shrinkage deformation. The paste with high w/b had higher contents of non-evaporated water and calcium hydroxide, as well as higher reaction degree of DWSA. Nanoscale characterization shows that reducing the w/b reduced the volume fraction of pore and unhydrated phases in the matrix and increased the proportion of high-density C-S-H. Meanwhile, reducing the w/b also reduced the interfacial transition zone width of DWSA-modified concrete. Recycling DWSA in concrete effectively reduced the total carbon footprint and cost of the mixture. The combined application of reducing the w/ b and incorporating DWSA effectively improved the economic and environmental benefits of concrete material. For the concrete modified with 10 % DWSA (w/b = 0.3), its cost and carbon emissions are reduced by 14 %-21 % and 19 %-25 % compared with the reference sample, respectively. Overall, this study reveals the action mechanism of DWSA in cement system at different w/b from nanoscale perspective, and gives a new insight on determining the op-timal w/b in full-scale application of DWSA concrete.
引用
收藏
页数:13
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