Effect of Coating on Mechanical Properties of Rapid Setting 3D Printing Cement Mortar

Abstract

Abstract: 3D printing mortar generally has the problems of weak interlayer interface bonding and low flexural strength. The expansion cement slurry coated on the surface of mortar can produce surface compressive stress and then improve its flexural strength. As an interface agent, coating between layers can simultaneously enhance the interfacial bond strength. In this paper, the coating composed of sulphoaluminate cement and expansive agent was coated on the surface and interlayer of the 3D printing mortar, and the effect of the coating on the mechanical properties of the 3D printing mortar specimens without fiber and with 0.5% (volume fraction) basalt fiber was studied. The experimental results show that the interlayer coating improves the interlayer interfacial bond strength of fiber-free and fiber-doped rapid setting 3D printing mortar by 21.4% and 12.2%, respectively. At the same time, it also improves the compressive strength. The effect of coating only surface on the flexural strength of the 3D printing mortar is similar to that of coating only between layers. At the same time, surface coating and interlayer coating have the most obvious improvement effect on the flexural strength of the 3D printing mortar. Compared with the fiber-free and fiber-doped non-coating specimens, the highest improvement rates are 44.2% and 23.2%, respectively. The effect of coating on the interlayer interfacial bond strength and flexural strength of fiber-free 3D printing specimens is better than that of fiber-doped specimens.

Key words: 3D printing cement mortar, coating, surface compressive stress, interfacial bond strength, flexural strength, compressive strength

CLC Number:

TU528

XIANG Yihan, CHEN Xuhao, DENG Yongjie, BAO Yiwang, LI Weihong. Effect of Coating on Mechanical Properties of Rapid Setting 3D Printing Cement Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1547-1553.

References

[1] 叶俊宏,郑怡,余江滔,等.3D打印纤维增强混凝土材料研究进展[J].硅酸盐学报,2021,49(11):2538-2548.
YE J H, ZHENG Y, YU J T, et al. Research progress on 3D printable fiber reinforced concrete[J]. Journal of the Chinese Ceramic Society, 2021, 49(11): 2538-2548 (in Chinese).
[2] 刘天浩,王里,李之建,等.混凝土3D打印加筋增韧方法研究进展[J].工业建筑,2021,51(6):9-15.
LIU T H, WANG L, LI Z J, et al. A review of incorporating reinforcement method in 3D concrete printing[J]. Industrial Construction, 2021, 51(6): 9-15 (in Chinese).
[3] ZHANG J C, WANG J L, DONG S F, et al. A review of the current progress and application of 3D printed concrete[J]. Composites Part A: Applied Science and Manufacturing, 2019, 125: 105533.
[4] MA G W, WANG L. A critical review of preparation design and workability measurement of concrete material for largescale 3D printing[J]. Frontiers of Structural and Civil Engineering, 2018, 12(3): 382-400.
[5] 孙晓燕,叶柏兴,王海龙,等.3D打印混凝土材料与结构增强技术研究进展[J].硅酸盐学报,2021,49(5):878-886.
SUN X Y, YE B X, WANG H L, et al. Recent development on reinforcing technology of 3D printing concrete materials and structure[J]. Journal of the Chinese Ceramic Society, 2021, 49(5): 878-886 (in Chinese).
[6] PANDA B, CHANDRA PAUL S, JEN TAN M. Anisotropic mechanical performance of 3D printed fiber reinforced sustainable construction material[J]. Materials Letters, 2017, 209: 146-149.
[7] MA G W, LI Z J, WANG L, et al. Mechanical anisotropy of aligned fiber reinforced composite for extrusion-based 3D printing[J]. Construction and Building Materials, 2019, 202: 770-783.
[8] 张超,邓智聪,汪智斌,等.纤维对3D打印混凝土打印性能与力学性能的影响[J].硅酸盐通报,2021,40(6):1870-1878+1888.
ZHANG C, DENG Z C, WANG Z B, et al. Effects of fibers on printing performance and mechanical properties of 3D printing concrete[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(6): 1870-1878+1888 (in Chinese).
[9] MARCHMENT T, SANJAYAN J. Mesh reinforcing method for 3D concrete printing[J]. Automation in Construction, 2020, 109: 102992.
[10] PERROT A, JACQUET Y, RANGEARD D, et al. Nailing of layers: a promising way to reinforce concrete 3D printing structures[J]. Materials, 2020, 13(7): 1518.
[11] BOS F P, AHMED Z Y, JUTINOV E R, et al. Experimental exploration of metal cable as reinforcement in 3D printed concrete[J]. Materials (Basel, Switzerland), 2017, 10(11): 1314.
[12] WANG L, TIAN Z H, MA G W, et al. Interlayer bonding improvement of 3D printed concrete with polymer modified mortar: experiments and molecular dynamics studies[J]. Cement and Concrete Composites, 2020, 110: 103571.
[13] BAO Y W, KUANG F H, SUN Y, et al. A simple way to make pre-stressed ceramics with high strength[J]. Journal of Materiomics, 2019, 5(4): 657-662.
[14] 包亦望,孙熠,旷峰华,等.高强度预应力陶瓷的发展与探索[J].无机材料学报,2020,35(4):399-406.
BAO Y W, SUN Y, KUANG F H, et al. Development and prospects of high strength pre-stressed ceramics[J]. Journal of Inorganic Materials, 2020, 35(4): 399-406 (in Chinese).
[15] ARUNOTHAYAN A R, NEMATOLLAHI B, RANADE R, et al. Development of 3D-printable ultra-high performance fiber-reinforced concrete for digital construction[J]. Construction and Building Materials, 2020, 257: 119546.
[16] ZAREIYAN B, KHOSHNEVIS B. Effects of mixture ingredients on interlayer adhesion of concrete in contour crafting[J]. Rapid Prototyping Journal, 2018, 24(3): 584-592.
[17] 黄璐,卓卫东,谷音,等.界面剂对新旧混凝土界面粘结性能影响的试验研究[J].福州大学学报(自然科学版),2018,46(3):396-402.
HUANG L, ZHUO W D, GU Y, et al. Effect test of interface agent on bonding of old and new concrete[J]. Journal of Fuzhou University (Natural Science Edition), 2018, 46(3): 396-402 (in Chinese).