To explore the axial compressive stress-strain relationship of Ultra-High Performance Seawater Sea-sand Concrete (UHPSSC) and study the influence of steel fiber volume content on the axial compressive mechanical properties and axial compressive complete stress-strain curve of UHPSSC, the complete stress-strain curve of UHPSSC was obtained through the compression tests with the Instron 1346 universal material, and the Pycharm curve fitting program was used to fit and modify the existing concrete complete stress-strain curve model. The results show that the higher the steel fiber content, the smaller the damage degree of UHPSSC under axial compression, and the compressive strength and peak strain also increase. The rising section of the UHPSSC stress-strain curve fitted by the existing model is similar to the test curve, and the gap between the falling section and the later stage is large. By modifying the shape parameters of the descending section, a modified model more suitable for describing the complete stress-strain curve of UHPSSC was obtained, and the applicable scope of the modified model was verified.
ZHAOY F, HUX, SHIC J, et al. A review on seawater sea-sand concrete: Mixture proportion, hydration, microstructure and properties [J]. Construction and Building Materials, 2021, 295: 123602.
HUANGL, XIEJ H, LUZ Y.Research progress and prospects on seawater sea-sand concrete [J]. Concrete, 2020(9):155-160. (in Chinese)
[4]
LOUT J, LOPESS M R, LOPESA V. External CFRP tendon members: Secondary reactions and moment redistribution [J]. Composites: Part B, 2014, 57: 250-261.
[5]
LIY L, ZHAOX L, SINGHR R K. Mechanical properties of seawater and sea sand concrete-filled FRP tubes in artificial seawater [J]. Construction and Building Materials, 2018, 191: 977-993.
[6]
DÖNMEZA, RASOOLINEJADM, BAŽANTZ P. Size effect on FRP external reinforcement and retrofit of concrete structures [J]. Journal of Composites for Construction, 2020, 24(5): 04020056.
ZHOUJ L, OUZ W, JIANGS Y, et al.Discussion of rebar-protection properties of seawater seasand concrete mixed with admixture and corrosion inhibitor[J].Journal of Building Materials, 2012,15 (1) : 69-74. (in Chinese)
[9]
HUANGB T, WUJ Q, YUJ, et al. Seawater sea-sand engineered/strain-hardening cementitious composites (ECC/SHCC): Assessment and modeling of crack characteristics [J]. Cement and Concrete Research, 2021, 140: 106292.
[10]
LIL G, XIAOB F, FANGZ Q, et al. Feasibility of glass/basalt fiber reinforced seawater coral sand mortar for 3D printing [J]. Additive Manufacturing, 2021, 37: 1-12.
[11]
VAFAEID, HASSANLIR, MAX, et al. Sorptivity and mechanical properties of fiber-reinforced concrete made with seawater and dredged sea-sand [J]. Construction and Building Materials, 2021, 270: 121436.
ZHUD J, LIL F, ZHOUL L, et al. Composition design of ultra-high performance seawater sea-sand concrete and fiber strengthening and toughening [J]. Journal of Hunan University (Natural Sciences),2023,50 (1):128-136. (in Chinese)
[14]
EBEADU, LAUD, LOLLINIF, et al. A review of recent advances in the science and technology of seawater-mixed concrete [J]. Cement and Concrete Research, 2021, 152: 1-13.
LIH. Hardening,corrosion properties of seawater sea sand cementitious based materials with ultra low water to binder ratio [D]. Changsha: Hunan University, 2021:95-96. (in Chinese)
ZHUD J, LIL F, GUOS C. Research on influence factors of performance of ultra-high performance seawater sea-sand concrete [J].Journal of Hunan University(Nature Sciences), 2022, 49(3): 187-195. (in Chinese)
[19]
TENGJ G, XIANGY, YUT, et al. Development and mechanical behaviour of ultra-high-performance seawater sea-sand concrete[J]. Advances in Structural Engineering, 2019, 22(14): 3100-3120.
[20]
LIT Y, LIUX Y, ZHANGY M, et al. Preparation of sea water sea sand high performance concrete (SHPC) and serving performance study in marine environment [J]. Construction and Building Materials, 2020, 254: 119114.
[21]
WANGJ Y, GUOJ Y. Damage investigation of ultra high performance concrete under direct tensile test using acoustic emission techniques [J]. Cement and Concrete Composites, 2017,88: 17-18.
[22]
RAJCZAKOWSKAM, NILSSONL, HABERMEHL-CWIRZENK, et al. Does a high amount of unhydrated portland cement ensure an effective autogenous self-healing of mortar?[J]. Materials (Basel), 2019, 12(20): 3298.
[23]
卢佳. 海水海砂混凝土单轴受压应力-应变关系研究 [D]. 大连: 大连理工大学, 2020.
[24]
LUJ. Study on the stress-strain relationship of seawater sea-sand concrete under uniaxial compression [D]. Dalian: Dalian University of Technology, 2020. (in Chinese)
WANGL, CHIY, XUL H, et al. Size effect of mechanical properties of hybrid fiber ultra-high performance concrete[J].Journal of Building Materials, 2022, 25(8): 781-788.(in Chinese)
Basic properties and test methods of ultra-high performance concrete : T / CBMF 37―2018 [S].Beijing : China Building Materials Industry Press, 2018. (in Chinese)
[35]
活性粉末混凝土:GB/T 31387―2015 [S]. 北京: 中国标准出版社, 2015.
[36]
Reactive powder concrete: GB / T 31387―2015 [S]. Beijing : Standard Press of China, 2015. (in Chinese)
ZHANGQ W. Research of steel fiber types and curing methods on mechanical properties of RPC[D]. Harbin: Harbin Institute of Technology, 2018:6-8. (in Chinese)
[39]
ALSALMANA, DANGC N, PRINZG S, et al. Evaluation of modulus of elasticity of ultra-high performance concrete [J]. Construction and Building Materials, 2017, 153: 918-928.
JUY Z, WANGD H, LIQ C, et al. Effect of steel fiber pattern on mechanical properties of reactive powder concrete[J]. Journal of Experimental Mechanics, 2011, 26(3): 254-259. (in Chinese)
[47]
CARREIRAD J, CHUK H. Stress-strain relationship for plain concrete in compression[J]. Journal of the American Concrete Institute, 1985, 82(6): 797-804.
ANM Z, SONGZ H, LIY, et al. Study on compressive mechanical properties of RPC materials with different steel fiber contents [J]. China Railway Science, 2009,30(5): 34-38. (in Chinese)
HUANGZ Y, TANB. Research on the stress-strain curves of reactive powder concrete with steel fiber under uniaxial compression[J].Journal of China Three Gorges University (Natural Sciences), 2007, 29(5): 415-420. (in Chinese)