Effect of Interlayer Water Film on Interfacial Characteristics of 3D Printed Concrete

Abstract

Abstract: The preparation and performance optimization of concrete materials are the basis for the structural development and application of 3D printed building. The macroscopic mechanical properties and long-term durability of 3D printed concrete materials are directly related to the microstructure of interface. The formation mechanism of interlayer interface moisture state (water film) of 3D printed concrete was clarified, the evolution law of water film with time for different printing layer thickness strips was tested, the effects of time interval, printing layer height and environmental state on the pore characteristics of interlayer interface were studied by using CT scanning technology, and the interaction mechanism among interlayer interface moisture state, pore characteristics and binding performance was revealed. The results show that the interlayer interface porosity decreases with the increase of interlayer interface water mass per unit area, and the interlayer interface moisture quality is a more direct factor affecting interlayer interface state than the printing parameters. The interlayer interface moisture state and pore characteristics directly affect macroscopic mechanical properties of 3D printed concrete materials.

Key words: 3D printed concrete, interlayer interface, moisture state, pore characteristic, binding strength

CLC Number:

TU502

RUI Aoyu, WANG Li, MA Guowei. Effect of Interlayer Water Film on Interfacial Characteristics of 3D Printed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2281-2289.

References

[1] HOU S D, DUAN Z H, XIAO J Z, et al. A review of 3D printed concrete: performance requirements, testing measurements and mix design[J]. Construction and Building Materials, 2021, 273: 121745.
[2] MOELICH G M, KRUGER J, COMBRINCK R. Plastic shrinkage cracking in 3D printed concrete[J]. Composites Part B: Engineering, 2020, 200: 108313.
[3] CHEN Y N, JIA L T, LIU C, et al. Mechanical anisotropy evolution of 3D-printed alkali-activated materials with different GGBFS/FA combinations[J]. Journal of Building Engineering, 2022, 50: 104126.
[4] WANG L, MA G W, LIU T H, et al. Interlayer reinforcement of 3D printed concrete by the in-process deposition of U-nails[J]. Cement and Concrete Research, 2021, 148: 106535.
[5] 张超, 邓智聪, 马蕾, 等. 3D打印混凝土研究进展及其应用[J]. 硅酸盐通报, 2021, 40(6): 1769-1795.
ZHANG C, DENG Z C, MA L, et al. Research progress and application of 3D printing concrete[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(6): 1769-1795 (in Chinese).
[6] 张翼, 朱艳梅, 任强, 等. 3D打印建筑技术及其水泥基材料研究进展评述[J]. 硅酸盐通报, 2021, 40(6): 1796-1807.
ZHANG Y, ZHU Y M, REN Q, et al. Progress on 3D printing construction technology and its cement-based materials[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(6): 1796-1807 (in Chinese).
[7] 常西栋, 李维红, 王乾. 3D打印混凝土材料及性能测试研究进展[J]. 硅酸盐通报, 2019, 38(8): 2435-2441.
CHANG X D, LI W H, WANG Q. Research progress of 3D printed concrete materials and its performance test[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(8): 2435-2441 (in Chinese).
[8] 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.
[9] LIU H, LIU C, WU Y, et al. 3D printing concrete with recycled coarse aggregates: the influence of pore structure on interlayer adhesion[J]. Cement and Concrete Composites, 2022, 134: 104742.
[10] ZHOU W, ZHANG Y M, MA L, et al. Influence of printing parameters on 3D printing engineered cementitious composites (3DP-ECC)[J]. Cement and Concrete Composites, 2022, 130: 104562.
[11] KEITA E, BESSAIES-BEY H, ZUO W Q, et al. Weak bond strength between successive layers in extrusion-based additive manufacturing: measurement and physical origin[J]. Cement and Concrete Research, 2019, 123: 105787.
[12] MOELICH G M, KRUGER J, COMBRINCK R. Modelling the interlayer bond strength of 3D printed concrete with surface moisture[J]. Cement and Concrete Research, 2021, 150: 106559.
[13] WOLFS R J M, BOS F P, SALET T A M. Hardened properties of 3D printed concrete: the influence of process parameters on interlayer adhesion[J]. Cement and Concrete Research, 2019, 119: 132-140.
[14] KAYONDO M, COMBRINCK R, BOSHOFF W P. State-of-the-art review on plastic cracking of concrete[J]. Construction and Building Materials, 2019, 225: 886-899.
[15] NIU X J, LI Q B, LIU W J, et al. Effects of ambient temperature, relative humidity and wind speed on interlayer properties of dam concrete[J]. Construction and Building Materials, 2020, 260: 119791.
[16] YIM H J, KIM J H, KWAK H G, et al. Evaluation of internal bleeding in concrete using a self-weight bleeding test[J]. Cement and Concrete Research, 2013, 53: 18-24.