Anisotropy and Cause Analysis of Carbonation Resistance of 3D Printed Concrete

Abstract

Abstract: Attributed to extrusion technology, there are many interfaces in 3D printed concrete, such as interlayer and interstrip interfaces, which affect the durability of printed concrete. In order to investigate the effect of printed interfaces and water binder ratio on the carbonation resistance of 3D printed concrete, the carbonation behavior of 3D printed concrete with three water binder ratios along X, Y, and Z directions was studied through carbonation tests. Based on mercury intrusion testing and X-CT scanning, the pore characteristics and distribution patterns in 3D printed concrete were obtained, and the change mechanism of carbonation resistance of 3D printed concrete was explained from a microscopic level. The research results indicate that pores are closely related to the carbonation behavior of 3D printed concrete. The interstrip and interlayer interfaces generate more pores due to the stacking of stripes, resulting in faster diffusion of CO₂ and greater carbonation depth at these two positions. Therefore, the carbonation resistance of printed concrete exhibits significant anisotropy due to the influences of interfaces. The carbonization resistance of matrix material is better than that of interlayer position and the carbonization resistance of interlayer position is better than that of interstrip position. The lower the water binder ratio is, the better the carbonization resistance of material is. When CO₂ diffuses in concrete, the uncarbonized islands are formed in printed concrete due to the effect of large pores between layers.

Key words: 3D printed concrete, printed interface, water binder ratio, porosity, carbonation, CT scanning

CLC Number:

TU528

WANG Hailong, HOU Jianhua, SUN Xiaoyan, LIN Xiqiang, LU Lan. Anisotropy and Cause Analysis of Carbonation Resistance of 3D Printed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1704-1712.

References

[1] PAOLINI A, KOLLMANNSBERGER S, RANK E. Additive manufacturing in construction: a review on processes, applications, and digital planning methods[J]. Additive Manufacturing, 2019, 30: 100894.
[2] LIU J L, NGUYEN-VAN V, PANDA B, et al. Additive manufacturing of sustainable construction materials and form-finding structures: a review on recent progresses[J]. 3D Printing and Additive Manufacturing, 2022, 9(1): 12-34.
[3] CAMACHO D D, CLAYTON P, O’BRIEN W J, et al. Applications of additive manufacturing in the construction industry: a forward-looking review[J]. Automation in Construction, 2018, 89: 110-119.
[4] DE SCHUTTER G, LESAGE K, MECHTCHERINE V, et al. Vision of 3D printing with concrete: technical, economic and environmental potentials[J]. Cement and Concrete Research, 2018, 112: 25-36.
[5] 王里, 林文宇, 姜海龙. 3D打印风积沙混凝土抗碳化性能试验研究[J]. 长沙理工大学学报(自然科学版), 2022, 19(4): 64-74.
WANG L, LIN W Y, JIANG H L. Experimental study on carbonation resistance of 3D printed concrete with aeolian sand[J]. Journal of Changsha University of Science & Technology (Natural Science), 2022, 19(4): 64-74 (in Chinese).
[6] 王云峰. 养护龄期对粉煤灰混凝土抗碳化性能影响研究[J]. 铁道建筑技术, 2022(8): 10-14.
WANG Y F. Study on the effect of curing period on carbonation resistance of fly ash concrete[J]. Railway Construction Technology, 2022(8): 10-14 (in Chinese).
[7] 陈雯. 后掺骨料混凝土抗碳化性能试验研究[D]. 大连: 大连理工大学, 2022.
CHEN W. Experimental study on anti-carbonation performance of after-mixing coarse aggregate concrete[D].Dalian: Dalian University of Technology, 2022 (in Chinese).
[8] 李阳阳. 再生骨料掺量对混凝土碳化性能影响研究[D]. 西安: 西安科技大学, 2021.
LI Y Y. Influence of recycled aggregate content on carbonation performance of concrete[D].Xi’an: Xi’an University of Science and Technology, 2021 (in Chinese).
[9] 罗祖赟. PVA纤维改性对混凝土抗碳化性能的影响研究[D]. 武汉: 华中科技大学, 2021.
LUO Z Y. Study on effect of PVA fiber modification on carbonation resistance of concrete[D].Wuhan: Huazhong University of Science and Technology, 2021 (in Chinese).
[10] ZHANG Y, ZHANG Y S, SHE W, et al. Rheological and harden properties of the high-thixotropy 3D printing concrete[J]. Construction and Building Materials, 2019, 201: 278-285.
[11] 王里, 王伯林, 白刚, 等. 3D打印混凝土各向异性力学性能研究[J]. 实验力学, 2020, 35(2): 243-250.
WANG L, WANG B L, BAI G, et al. Experimental study on the mechanical anisotropy of 3D printed concrete[J]. Journal of Experimental Mechanics, 2020, 35(2): 243-250 (in Chinese).
[12] SUN X Y, WANG Q, WANG H L, et al. Influence of multi-walled nanotubes on the fresh and hardened properties of a 3D printing PVA mortar ink[J]. Construction and Building Materials, 2020, 247: 118590.
[13] LE T T, AUSTIN S A, LIM S, et al. Hardened properties of high-performance printing concrete[J]. Cement and Concrete Research, 2012, 42(3): 558-566.
[14] 张静. 3D打印混凝土本构模型与梁的受弯性能研究[D]. 杭州: 浙江大学, 2021.
ZHANG J. Constitutive model of 3D printed concrete and flexural behavior of beams [D]. Hangzhou: Zhejiang University, 2021 (in Chinese).
[15] 张大旺, 王栋民. 3D打印混凝土材料及混凝土建筑技术进展[J]. 硅酸盐通报, 2015, 34(6): 1583-1588.
ZHANG D W, WANG D M. Progress of 3D print of concrete materials and concrete construction technology[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(6): 1583-1588 (in Chinese).
[16] 汪群. 3D打印混凝土拱桥结构关键技术研究[D]. 杭州: 浙江大学, 2019.
WANG Q. Research on the pivotal technology of 3D printed concrete arch bridge[D].Hangzhou: Zhejiang University, 2019 (in Chinese).
[17] SUN X Y, ZHOU J W, WANG Q, et al. PVA fibre reinforced high-strength cementitious composite for 3D printing: mechanical properties and durability[J]. Additive Manufacturing, 2022, 49: 102500.
[18] HOUST Y F, WITTMANN F H. Influence of porosity and water content on the diffusivity of CO₂ and O₂ through hydrated cement paste[J]. Cement and Concrete Research, 1994, 24(6): 1165-1176.