Preparation and Reinforcement Adaptability of Jute Fiber Reinforced Magnesium Phosphate Cement Based Composite Materials

Abstract

To improve the brittleness characteristics of magnesium phosphate cement-based materials (MPC) and to promote its promotion and application in the field of structural reinforcement and repair, this study aimed to increase the toughness of MPC by adding jute fiber, explore the effects of different amounts of jute fiber on the working and mechanical properties of MPC, and prepare jute fiber reinforced magnesium phosphate cement-based materials (JFRMPC) to reinforce damaged beams. The improvement effect of beam performance before and after reinforcement was compared, and the strengthening and toughening mechanisms of jute fiber on MPC were explored through microscopic analysis. The experimental results show that, as the content of jute fiber (JF) increases, the fluidity and setting time of MPC decrease continuously; When the content of jute fiber is 0.8%, the compressive strength, flexural strength, and bonding strength of MPC at 28 days reach their maximum values, which are increased by 18.0%, 20.5%, and 22.6% compared to those of M0, respectively. The beam strengthened with JFRMPC can withstand greater deformation, with a deflection of 2.3 times that of the unreinforced beam at failure. The strain of the steel bar is greatly reduced, and the initial crack and failure loads of the reinforced beam are increased by 192.1% and 16.1%, respectively, compared to those of the unreinforced beam. The JF added to the MPC matrix dissipates energy through tensile fracture and debonding pull-out, slowing down stress concentration and inhibiting the free development of cracks in the matrix, enabling JFRMPC to exhibit higher strength and better toughness. The JF does not cause the hydration of MPC to generate new compounds but reduces the amount of hydration products generated.

Keywords

magnesium phosphate cement / jute fiber / reinforcement of damaged beam / flexural behavior

References

[1] Chen B, Wu Z, Wu XP. Experimental Research on the Properties of Modified MPC[J]. Journal of Wuhan University of Technology, 2011, 33(04): 29-34.

[2] Qiao F, Chau CK, Li ZJ. Property Evaluation of Magnesium Phosphate Cement Mortar as Patch Repair Material[J]. Construction and Building Materials, 2009, 24(5): 695-700.

[3] Liu J, Liu C, Liu YQ. Mechanical Properties of Glass Fiber Reinforced Magnesium Phosphate Cement[J]. Journal of Materials Science and Engineering, 2020, 38(06): 1026-1031.

[4] Wagh AS, Strain R, Jeong SY, et al. Stabilization of Rocky Flats Pu-contaminated Ash within Chemically Bonded Phosphate Ceramics[J]. Journal of Nuclear Materials, 1999, 265(3): 295-307.

[5] Pinto D, Bernardo L, Amaro A, et al. Mechanical Properties of Epoxy Nanocomposites Using Titanium Dioxide as Reinforcement-A Review[J]. Construction and Building Materials, 2015, 95: 506-524.

[6] Qin JH, Qian JS, You C, et al. Bond Behavior And Interfacial Micro-Characteristics of Magnesium Phosphate Cement onto Old Concrete Substrate[J]. Construction and Building Materials, 2018, 167: 166-176.

[7] Li JS, Zhang WB, Cao Y. Laboratory Evaluation of Magnesium Phosphate Cement Paste and Mortar for Rapid Repair of Cement Concrete Pavement[J]. Construction and Building Materials, 2014, 58: 122-128.

[8] Li J, Ji YS, Zhang L, et al. Microstructure and Property Evolution of Interfacial Microregion of Magnesium Phosphate Cement on Mortar under Various Environments[J]. Structural Concrete, 2018, 19(4): 1-9.

[9] Chen B, Oderji SY, Chandan S, et al. Feasibility of Magnesium Phosphate Cement (MPC) as A Repair Material for Ballastless Track Slab[J]. Construction and Building Materials, 2017, 154: 270-274.

[10] Wang HT, Cao JH. Study on the Phosphate Cementbased Binder[J]. Journal of Logistical Engineering University, 2005, 01: 5-7.

[11] Haque MA, Chen B. Research Progresses on Magnesium Phosphate Cement: A Review[J]. Construction and Building Materials, 2019, 211: 885-898.

[12] Wagh AS. Chemically Bonded Phoshate Ceramics[M], 2016 Amsterdam: Elsevier. 115-131.

[13] Xiao BF, Chen Y, Fang Q, et al. Research Progresses on Magnesium Phosphate Cement-Based Composites: A Review[J]. Journal of Functional Materials, 2020, 51(08): 8007-8013.

[14] Feng H, Sheikh MN, Hadi MNS, et al. Mechanical Properties of Micro-steel Fiber Reinforced Magnesium Potassium Phosphate Cement Composite[J]. Construction and Building Materials, 2018, 185: 423-435.

[15] Li M, Yue Y F, Qian JS, et al. Investigation on the Mechanical Properties of Steel Fiber Reinforced Magnesium Phosphate Cement Concrete[J]. Engineering Journal of Wuhan University, 2022, 55(07): 691-698.

[16] Li Z, Qin JH, You C, et al. Mechanical Properties of Steel Fiber Reinforced Magnesium Phosphate Cement-based Composite by Slurry Infiltrating[J]. Journal of the Chinese Ceramic Society, 2019, 47(11): 1559-1565.

[17] Qin JH, Qian JS, Li Z, et al. Mechanical Properties of Basalt Fiber Reinforced Magnesium Phosphate Cement Composites[J]. Construction and Building Materials, 2018, 188: 946-955.

[18] Fang Y, Chen B, Oderji S Y. Experimental Research on Magnesium Phosphate Cement Mortar Reinforced by Glass Fiber[J]. Construction and Building Materials, 2018, 188: 729-736.

[19] Sun C, Ding Z. Study on PVA Fiber Modified Phosphate Cement-based Materials[J]. China Concrete and Cement Products, 2016, 12: 44-47.

[20] Lecompte T, Perrot A, Subrianto A, et al. A Novel Pull-out Device Used to Study the Influence of Pressure During Processing of Cement-based Material Reinforced with Coir[J]. Construction and Building Materials, 2015, 78: 224-233.

[21] Fang HT, Zhu ML, Yan TT. Effect of Modified Fiber on the Mechanical Properties of Reinforced Mortar[J]. Shanghai Textile Science and Technology, 2018, 46(10): 36-39.

[22] Islam MS, Ahmed SJU. Influence of Jute Fiber on Concrete Properties[J]. Construction and Building Materials, 2018, 189: 768-776.

[23] Zhang TZ, Yin Y, Gong YQ, et al. Mechanical Properties of Jute Fiber-reinforced High-strength Concrete[J]. Structural Concrete Journal of the FIB, 2020, 21(2): 703-712.

[24] Yu HS. Study on Concrete Reinforced with Jute Fibers[D], 2010 Shanghai: Donghua University.

[25] Yang T, Wang BZ, Luo HP. Study on Dynamic Compressive Mechanical Properties of Jute Fiber Reinforced Concrete[J]. Journal of Hefei University of Technology (Natural Science), 2020, 43(08): 1109-1114.

[26] Tan XL, Qiao L, Zhang WH. Research Progress in Super Rapid Hardening Magnesium Phosphate Cement[J]. Inorganic Chemicals Industry, 2016, 48(09): 5-9.

[27] Luo ZT, Wang YZ, Wang ZH, et al. Effect of Retarder Blending on Properties of Magnesium Phosphate Cement[J]. Journal of Wuhan University of Technology, 2019, 41(05): 7-11.

[28] Affan M, Ali M. Experimental Investigation on Mechanical Properties of Jute Fiber Reinforced Concrete Under Freeze-thaw Conditions for Pavement Applications[J]. Construction and Building Materials, 2022, 323: 126-599.

[29] Feng H, Shen SH, Pang YY, et al. Mechanical Properties of Fiber and Nano-Al₂O₃ Reinforced Magnesium Phosphate Cement Composite[J]. Construction and Building Materials, 2020, 270(4): 121-861.

[30] Gelli R, Tonelli M, Martini F, et al. Effect of Borax on the Hydration and Setting of Magnesium Phosphate Cements[J]. Construction and Building Materials, 2022, 348: 128-686.

[31] Li Y, Xie MY, Lin H, et al. Study on the Effect of Carbon Nanotube on the Properties of Magnesium Phosphate Cement[J]. Journal of Functional Materials, 2018, 49(07): 7129-7133.

[32] Wei Y, Zhou XT, Huang J, et al. Research Progress on the Effects of Retarders on the Properties and Hydration Mechanism of Magnesium Phosphate Cement[J]. Materials Reports, 2022, 36(04): 77-83.

[33] Hu HJ, Du X, Chen B. Factors Influencing Properties of Magnesium Phosphate Cement[J]. Sichuan Building Science, 2015, 41(04): 73-78.

[34] Yu YN. Experimental Study on Mechanical Properties of Natural Fiber Concrete[D], 2021 Huainan: Anhui University of Science and Technology.

[35] Liu K, Jiang C, Zhang BB, et al. Failure Mechanism of Dipotassium Hydrogen Phosphate Modified Magnesia-phosphate Cements under Water Curing Condition[J]. Journal of the Chinese Ceramic Society, 2012, 40(12): 1693-1698.

[36] Yao Y, Wang ZD, Wang L. Durability of Concrete under Combined Mechanical Load and Environmental Actions: A Review[J]. Journal of Sustainable Cement-Based Materials, 2012, 1(1–2): 2-15.

[37] Ma D. Effect of Fiber Dispersion Method on Mechanical Properties of Magnesium Phosphate Cement[D], 2019 Chongqing: Chongqing University.