钢纤维特征参数及成型方式对UHPC轴拉性能的影响

doi:10.11988/ckyyb.20240214

摘要/Abstract

摘要： 为探究超高性能混凝土(UHPC)在不同钢纤维下的单轴拉伸力学性能,设计了10组狗骨头型试件单轴拉伸试验,研究了钢纤维长径比(37、50、64、65)、掺率(2%、3%、4%)、形状(端钩型和弧型)和成型方式(搅拌法和渗浆法)对UHPC轴拉强度、应力-应变曲线、拉伸韧性和破坏过程的影响。结果表明:端钩型钢纤维长径比增加,UHPC轴拉强度提高6.54%~9.37%,软化段残余强度比值提高5.00%~38.30%;端钩型钢纤维体积掺率从2%增至3%、4%,UHPC抗拉强度、峰值应变和软化段残余强度比值均有所提高,拉伸韧性增加;端钩型钢纤维渗浆法成型试件相比搅拌法试件,强度变化不大,但峰值应变提高53.61%~91.96%;弧型钢纤维UHPC拉应力-应变曲线具有应变硬化特性,破坏过程呈多裂缝开展;与同长径比端钩型钢纤维试件相比,弧型钢纤维UHPC峰值拉应变提高了19.41~19.96倍,软化段残余强度比值提高18.00%~70.03%,弧型钢纤维增韧效果优于端钩型钢纤维。采用硬化指数和软化段残余强度比值方法可以全面评价UHPC轴拉峰前应变硬化特征和峰后的轴拉韧性。

关键词: 超高性能混凝土, 轴拉性能, 钢纤维, 特征参数, 成型方式

Abstract:

To explore the mechanical properties of ultra-high performance concrete (UHPC) with different steel fibers under uniaxial tension, we designed ten sets of uniaxial tensile tests on dog-bone-shaped UHPC specimens. We investigated how the aspect ratio (37, 50, 64, 65), dosage (2%, 3%, 4%), shape (end-hooked and curved), and forming methods(mixing and slurry) of steel fibers affect the tensile strength, stress-strain curves, tensile toughness, and failure process of UHPC. Results reveal that as the aspect ratio of hooked steel fiber rises, the tensile strength of UHPC increases by 6.54%-9.37%, and the residual strength ratio in the strain-softening segment grows by 5.00%-38.30%. When the volumetric dosage of end-hooked steel fiber increases from 2% to 3% and 4%, the tensile strength, peak strain, and residual strength ratio in the strain-softening segment of UHPC increase, along with an enhancement in tensile toughness. Compared with specimens formed by the mixing method, those formed by the slurry method with end-hooked steel fibers show no significant change in strength, but the peak strain increases by 53.61%-91.96%. The stress-strain curve of UHPC with curved steel fibers demonstrates strain-hardening characteristics, and its failure process involves the propagation of multiple cracks. In comparison to specimens with end-hooked steel fibers of the same aspect ratio, UHPC with curved steel fibers exhibits a 19.41-19.96-fold increase in peak tensile strain and an 18.00%-70.03% increase in the residual strength ratio in strain-softening segment. This indicates that the toughening effect of curved steel fibers is superior to that of end-hooked steel fibers. By using the hardening index and the residual strength ratio in the strain-softening segment, we can comprehensively evaluate the strain-hardening characteristics before peak axial-tensile strain and the axial-tensile toughness after peak in UHPC.

Key words: UHPC, tensile performance, steel fiber, characteristic parameters, forming method

中图分类号:

TU528混凝土及混凝土制品

邓宗才, 王梦新, 王宏君, 陈相宇. 钢纤维特征参数及成型方式对UHPC轴拉性能的影响[J]. raybet体育在线院报, 2025, 42(4): 177-182.

DENG Zong-cai, WANG Meng-xin, WANG Hong-jun, CHEN Xiang-yu. Influence of Steel Fiber Characteristic Parameters and Forming Methods on Tensile Performance of Ultra-high Performance Concrete[J]. Journal of Changjiang River Scientific Research Institute, 2025, 42(4): 177-182.

水泥	硅灰	矿粉	河砂		水	减水剂
水泥	硅灰	矿粉	212 ~380 μm	380 ~830 μm	水	减水剂
650	225	200	650	425	210	4.3

水泥	硅灰	矿粉	河砂		水	减水剂
水泥	硅灰	矿粉	212 ~380 μm	380 ~830 μm	水	减水剂
650	225	200	650	425	210	4.3

外形	编号	长度/ mm	直径/ mm	弧长/ mm	曲率半径/ mm	长径比	抗拉强度/ MPa
端钩型	H1	13	0.2			65	2 800
	H2	20	0.4			50	1 500
	H3	13	0.35			37	2 850
	H4	35	0.55			64	1 250
弧型	C1	35	0.55	30	15	64	1 250
弧型	C2	35	0.55	30	23	64	1 250

外形	编号	长度/ mm	直径/ mm	弧长/ mm	曲率半径/ mm	长径比	抗拉强度/ MPa
端钩型	H1	13	0.2			65	2 800
	H2	20	0.4			50	1 500
	H3	13	0.35			37	2 850
	H4	35	0.55			64	1 250
弧型	C1	35	0.55	30	15	64	1 250
弧型	C2	35	0.55	30	23	64	1 250

试件编号	成型方式	钢纤维类型	掺率/%	长径比
TA-H1-2	搅拌法	H1	2	65
TA-H2-2	搅拌法	H2	2	50
TA-H3-2	搅拌法	H3	2	37
TA-H1-3	搅拌法	H1	3	65
TA-H1-4	搅拌法	H1	4	65
TB-H1-2	渗浆法	H1	2	65
TB-H1-3	渗浆法	H1	3	65
TA-H4-2	搅拌法	H4	2	64
TA-C1-2	搅拌法	C1	2	64
TA-C2-2	搅拌法	C2	2	64

钢纤维特征参数及成型方式对UHPC轴拉性能的影响

Influence of Steel Fiber Characteristic Parameters and Forming Methods on Tensile Performance of Ultra-high Performance Concrete

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编号	初裂抗拉强度σ_c/ MPa	初裂应变 ε_c/ 10^-6	峰值抗拉强度σ_p/ MPa	峰值应变 ε_p/10^-6	抗拉弹性模量E_t/ GPa
TA-H1-2	4.85	102.58	5.02	140.00	44.63
TA-H2-2	4.59	105.90	4.89	129.13	42.19
TA-H3-2	4.41	101.29	4.59	115.93	37.80
TA-H1-3	5.40	106.51	5.49	210.00	51.57
TA-H1-4	5.51	112.24	5.63	495.27	50.46
TB-H1-2	5.22	85.86	5.32	215.05	58.77
TB-H1-3	5.61	91.14	5.71	403.12	60.68
TA-H4-2	4.44	158.30	4.52	216.17	44.23
TA-C1-2	2.99	91.84	3.31	4 412.05	59.37
TA-C2-2	3.63	112.00	4.55	4 530.41	49.90

编号	破坏类型	I_h	K₂	K₃	K₄	K₅	K₆	K₇	K₈
TA-H1-2	应变软化		0.73	0.65	0.55	0.45
TA-H2-2	应变软化		0.69	0.54	0.42	—
TA-H3-2	应变软化		0.63	0.47	0.40	0.35
TA-H1-3	应变软化		0.78	0.67	0.61	0.55
TA-H1-4	应变软化		0.79	0.70	0.64	0.56
TB-H1-2	应变软化		0.74	0.65	0.56	0.52
TB-H1-3	应变软化		0.83	0.69	0.62	0.57
TA-H4-2	应变软化		0.75	0.56	0.50	0.41
TA-C1-2	应变硬化	1.11				0.95	0.97	0.59	0.52
TA-C2-2	应变硬化	1.25				1.00	0.91	0.75	0.70

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