Modification of fresh and hardened properties of 3D-printed recycled mortar by superabsorbent polymers

被引:1
作者
Li, Bingying [1 ]
Ding, Tao [1 ,2 ]
Qu, Changwei [1 ]
Liu, Wei [3 ]
机构
[1] Tongji Univ, Coll Civil Engn, Dept Struct Engn, Shanghai 200092, Peoples R China
[2] Guangxi Univ, Guangxi Key Lab Disaster Prevent & Engn Safety, Nanning 530004, Peoples R China
[3] China Construct Third Engn Bur Grp Co Ltd, Wuhan 430704, Hubei, Peoples R China
来源
JOURNAL OF BUILDING ENGINEERING | 2024年 / 95卷
关键词
Concrete 3D printing; Recycled sand; Superabsorbent polymer (SAP); Printability; Autogenous shrinkage; CEMENT-BASED MATERIALS; PLASTIC SHRINKAGE; CONCRETE; CONSTRUCTION; WATER; STRENGTH; CRACKING;
D O I
10.1016/j.jobe.2024.110189
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The high water absorption level of recycled sand limits the applicability of 3D-printed recycled mortar. In this study, superabsorbent polymers (SAPs) were adopted to modify the properties of both fresh and hardened 3D-printed recycled mortar. The effects of various SAP dosages, particle sizes, and addition methods were carefully examined. X-ray diffraction (XRD) and computed tomography (CT) were adopted to observe the microstructure. The test results showed that the addition of SAP effectively improved the printability of the mixed mortar. Particularly, with the addition of SAP, the autogenous shrinkage was reduced by more than 50 %, indicating that the polymer had an obvious inhibitory effect on shrinkage. Furthermore, the hydration of cementitious materials was promoted, resulting in an increase in compressive strength by 27%-69 %. Microstructural analysis further confirmed that the addition of SAP optimized the pore structure and enhanced the density of the 3D-printed mortar but did not change the types of hydration products. Generally, for the modification of 3D-printed mortar with recycled sand, it would be recommended to add SAP at a doping level of 0.4 % with a particle size of 60-100 mesh.
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页数:15
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