钢纤维沙漠砂混凝土梁受弯力学性能试验

秦拥军; 张亮亮; 渠长伟; 罗玲

doi:10.13801/j.cnki.fhclxb.20211206.002

钢纤维沙漠砂混凝土梁受弯力学性能试验

doi: 10.13801/j.cnki.fhclxb.20211206.002

秦拥军^{1, 2},
张亮亮^1, ,,
渠长伟¹,
罗玲^{1, 2}

1.
新疆大学　建筑工程学院，乌鲁木齐 830047
2.
新疆土木工程技术研究中心，乌鲁木齐 830047

基金项目: 国家自然科学基金(51668060)；自治区高校科研计划自然科学项目(XJEDU2017I003)；兵团科技攻关项目(2019DB004)

详细信息

通讯作者:
张亮亮，硕士研究生，研究方向为土木工程材料　E-mail: 2902337569@qq.com

中图分类号: TU528.52
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出版历程
- 收稿日期: 2021-10-19
- 修回日期: 2021-11-25
- 录用日期: 2021-11-26
- 网络出版日期: 2021-12-07
- 刊出日期: 2022-11-01

Flexural mechanical properties of steel fiber desert sand concrete beams

QIN Yongjun^{1, 2},
ZHANG Liangliang^{1
, ,},
QU Changwei¹,
LUO Ling^{1, 2}

1.
School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, China
2.
Xinjiang Civil Engineering Technology Research Center, Urumqi 830047, China

摘要

摘要: 适量沙漠砂作为细骨料制备混凝土可有效提高混凝土的抗压强度，而钢纤维的掺入对混凝土抗拉性能有显著的提升作用。为探究钢纤维沙漠砂混凝土梁受弯力学特性，设计11根试验梁，分别研究钢纤维体积掺量、沙漠砂替代率和配筋率对受弯梁的影响规律。试验研究表明，钢纤维沙漠砂混凝土梁相对于普通混凝土梁其受弯承载力提高了4%~22%，受弯梁裂缝数量随钢纤维掺量增加呈现降低趋势，钢纤维减小了混凝土表面的弹塑性变形，而“桥架作用”抑制了裂缝的产生和提高了试验梁的承载力；随着配筋率的增加，主裂缝宽度呈减小的趋势，但极限荷载则逐渐增加，表明配筋率是影响受弯梁承载力主要因素之一；沙漠砂的“填充作用”密实了混凝土，使构件整体性能呈现良好的状态。试验梁的开裂荷载、修正后的极限弯矩理论计算值和试验值吻合效果良好，误差均小于5%。沙漠砂替代工程用砂制备混凝土，可以充分发挥当地资源优势，节约河砂资源，保护河湖生态环境，达到绿色建筑目标。
- 钢纤维体积掺量 /
- 沙漠砂替代率 /
- 裂缝规律 /
- 桥架作用 /
- 填充作用 /
- 混凝土梁
Abstract: Appropriate amount of desert sand as fine aggregate can effectively improve the compressive strength of concrete, and the incorporation of steel fiber has a significant effect on the tensile properties of concrete. In order to explore the flexural mechanical properties of steel fiber desert sand concrete beams, 11 test beams were designed to study the influence of steel fiber volume content, desert sand replacement rate and reinforcement ratio on flexural beams. The result shows that the flexural bearing capacity of steel fiber desert sand concrete beam is increased by 4%-22% compared with that of ordinary concrete beam, and the number of cracks in the flexural beam decreases with the increase of steel fiber content. Steel fiber reduces the elastic-plastic deformation of concrete surface, and the ‘bridge action’ inhibits the generation of cracks and improves the bearing capacity of the test beam. With the increase of reinforcement ratio, the main crack width decreases, but the ultimate load increases gradually, which indicates that the reinforcement ratio is one of the main factors affecting the bearing capacity of the bending beam. The ‘filling effect’ of desert sand compacts the concrete and makes the overall performance of the component present a good state. The cracking load of the test beam and the corrected theoretical calculation value of ultimate bending moment are in good agreement with the test value, and the error is less than 5%. The preparation of concrete by desert sand instead of engineering sand can give full play to the advantages of local resources, save river sand resources, protect the ecological environment of rivers and lakes, and achieve the goal of green building.
- volume fraction of steel fiber /
- desert sand substitution rate /
- fracture regularity /
- bridge function /
- filling effect /
- concrete beams

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图 1 试验加载装置示意图

Figure 1. Schematic diagram of test loading device

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图 2 部分钢纤维退出工作图

Figure 2. Exit work diagram of partial steel fiber

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图 3 破坏阶段钢筋和钢纤维状态

Figure 3. State of steel bar and steel fiber in failure stage

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图 4 SFDSC梁破坏状态

Figure 4. Failure states of SFDSC beams

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图 5 不同沙漠砂替代率R_ds时SFDSC梁荷载-位移曲线

Figure 5. Load-displacement curve of SFDSC beam with different desert sand replacement rate R_ds

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图 6 不同钢纤维体积掺量V_sf时SFDSC梁荷载-位移曲线

Figure 6. Load-displacement curve of SFDSC beam with different volume content of steel fiber V_sf

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图 7 V_sf=1.0%和R_ds=40%时SFDSC梁荷载-位移曲线

Figure 7. Load-displacement curve of SFDSC beam with V_sf=1.0% and R_ds=40%

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图 8 考虑到R_ds的SFDSC梁拟合曲线

Figure 8. Fitting curve of SFDSC beams considering R_ds steel fiber

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表 1 钢纤维尺寸及力学性能

Table 1. Steel fiber size and mechanical properties

Type	L₀/mm	L_f/mm	D_f/μm	L₀/D_f	F_tk/MPa
End hook type	35	38	750	46.7	1000
Notes: L₀—Effective length; L_f—Total length; D_f—Equivalent diameter; F_tk—Tensile strength.

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表 2 钢纤维沙漠砂混凝土(SFDSC)梁参数

Table 2. Parameters of steel fiber desert sand concrete (SFDSC) beams

Number	b×h/mm²	h₀/mm	L/mm	L₀/mm	V_sf/%	R_ds/%	L_r	R_r/%
Number	b×h/mm²	h₀/mm	L/mm	L₀/mm	V_sf/%	R_ds/%	L_r	R_r/%
SFDSC-0/0-0.97	150×300	259	1800	1500	0.0	0	216	0.97
SFDSC-0.5/20-0.97	150×300	259	1800	1500	0.5	20	216	0.97
SFDSC-1.0/20-0.97	150×300	259	1800	1500	1.0	20	216	0.97
SFDSC-1.5/20-0.97	150×300	259	1800	1500	1.5	20	216	0.97
SFDSC-2.0/20-0.97	150×300	259	1800	1500	2.0	20	216	0.97
SFDSC-0.5/40-0.97	150×300	259	1800	1500	0.5	40	216	0.97
SFDSC-1.0/40-0.97	150×300	259	1800	1500	1.0	40	216	0.97
SFDSC-1.5/40-0.97	150×300	259	1800	1500	1.5	40	216	0.97
SFDSC-2.0/40-0.97	150×300	259	1800	1500	2.0	40	216	0.97
SFDSC-1.0/40-1.23	150×300	258	1800	1500	1.0	40	218	1.23
SFDSC-1.0/40-1.52	150×300	257	1800	1500	1.0	40	220	1.52
Notes: b—Beam width; h—Beam height; h₀—Effective height; L—Beam length; V_sf—Volume content of steel fiber; R_ds—Replacement rate of desert sand; L_r—Longitudinal reinforcement; R_r—Reinforcement ratio. For example, in SFDSC-1.0/40-1.23, 1.0/40 represent the contents of steel fiber and desert sand, 1.23 represents reinforcement ratio.

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表 3 SFDSC梁基本力学性能和开裂荷载

Table 3. Basic mechanical properties and cracking load of SFDSC beams

Number	f_cc/MPa	f_ts/MPa	$ {f}_{\mathrm{t}\mathrm{k}}({f}_{\mathrm{f}\mathrm{t}\mathrm{k}}) $/MPa	E_c($ {E}_{\mathrm{s}\mathrm{f}\mathrm{r}\mathrm{c}} $)/GPa	P_cr/kN	M_cr/(kN·m)	M_cr0/(kN·m)	M_cr/M_cr0
SFDSC-0/0-0.97	46.00	4.21	3.79	33.85	44.75	11.19	10.79	1.037
SFDSC-0.5/20-0.97	52.67	5.27	5.02	34.73	51.09	12.77	12.84	0.995
SFDSC-1.0/20-0.97	56.79	6.63	5.83	35.61	59.95	14.99	14.86	1.009
SFDSC-1.5/20-0.97	52.12	7.94	6.64	34.60	67.05	16.76	16.98	0.987
SFDSC-2.0/20-0.97	50.45	8.19	7.45	34.23	76.36	19.09	19.07	1.001
SFDSC-0.5/40-0.97	58.71	6.16	5.02	36.01	50.37	12.59	12.78	0.985
SFDSC-1.0/40-0.97	55.64	7.09	5.83	35.37	60.00	15.00	14.87	1.009
SFDSC-1.5/40-0.97	53.82	8.26	6.64	34.98	78.26	19.57	16.96	1.154
SFDSC-2.0/40-0.97	52.87	8.92	7.45	34.77	76.24	19.06	19.04	1.001
SFDSC-1.0/40-1.23	55.32	7.15	5.83	35.30	59.99	15.00	15.38	0.975
SFDSC-1.0/40-1.52	55.46	7.06	5.83	35.33	64.33	16.08	15.99	1.006
Notes: f_cc—Cube compressive strength; f_ts—Cube splitting tensile strength; f_tk—Standard value of tensile strength of ordinary concrete; f_ftk—Standard value of tensile strength of steel fiber desert sand concrete; E_c—Elastic modulus of ordinary concrete; E_sfrc—Elastic modulus of steel fiber desert sand concrete; P_cr—Cracking load; M_cr—Experimental value of bending beam cracking load; M_cr0—Theoretical calculation value of bending beam cracking load.

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表 4 SFDSC梁承载力实测值与计算值及修正理论值比较

Table 4. Comparison of measured and calculated bearing capacity and modified theoretical values of SFDSC beams

Number	P_max/kN	M_u/(kN·m)	M_u0/(kN·m)	M_u/M_u0	M'/(kN·m)	M_u/M'
SFDSC-0/0-0.97	194.01	48.50	34.74	1.396	47.04	1.031
SFDSC-0.5/20-0.97	201.77	50.44	39.16	1.288	50.83	0.992
SFDSC-1.0/20-0.97	214.11	53.53	43.21	1.239	56.09	0.954
SFDSC-1.5/20-0.97	223.89	55.97	46.99	1.191	60.99	0.918
SFDSC-2.0/20-0.97	229.90	57.48	50.46	1.139	65.50	0.878
SFDSC-0.5/40-0.97	216.25	54.06	39.16	1.381	48.64	1.112
SFDSC-1.0/40-0.97	234.35	58.59	43.21	1.356	53.67	1.092
SFDSC-1.5/40-0.97	236.51	59.13	46.99	1.258	58.36	1.013
SFDSC-2.0/40-0.97	229.99	57.50	50.46	1.139	62.67	0.917
SFDSC-1.0/40-1.23	241.91	60.48	50.37	1.201	62.56	0.967
SFDSC-1.0/40-1.52	312.09	78.02	58.17	1.341	72.25	1.080
Notes: P_max—Maximum load; M_u—Experimental value of ultimate load of bending beam; M_u0—Theoretical calculation value of ultimate load of bending beam; M'—Modified theoretical calculation value of ultimate load of bending beam.

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表 5 SFDSC梁刚度和挠度

Table 5. Stiffness and deflection of SFDSC beams

Number	B_fs/(N·mm²)	f/mm	f₀/mm	f₀/f
SFDSC-0/0-0.97	4541586912613	2.56	2.81	1.098
SFDSC-0.5/20-0.97	4982743668953	2.43	2.77	1.142
SFDSC-1.0/20-0.97	5430396736648	2.36	2.71	1.147
SFDSC-1.5/20-0.97	5788406359728	2.32	2.60	1.122
SFDSC-2.0/20-0.97	6172974602027	2.23	2.49	1.116
SFDSC-0.5/40-0.97	5037073861873	2.57	2.75	1.069
SFDSC-1.0/40-0.97	5419431759144	2.59	2.81	1.085
SFDSC-1.5/40-0.97	5807600578386	2.44	2.67	1.094
SFDSC-2.0/40-0.97	6202500910678	2.22	2.50	1.125
SFDSC-1.0/40-1.23	5901305918417	2.46	2.73	1.112
SFDSC-1.0/40-1.52	6475097572356	2.89	3.00	1.039
Notes: f—Experimental value of bending beam deflection; f₀—Theoretical calculation value of bending beam deflection; B_fs—Short-term stiffness of bending beam.

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表 6 SFDSC待测梁的参数

Table 6. Parameters of SFDSC beam to be tested

Number	b×h/mm²	h₀/mm	L₀/mm	V_sf/%	R_ds/%	R_r/%	f_cc/MPa	f_ts/MPa
SFDSC-0/40-0.97	150×300	259	1500	0.0	40	0.97	47.4	4.49
SFDSC-0.5/60-0.97	150×300	259	1500	0.5	60	0.97	51.1	6.62
SFDSC-1.0/60-0.97	150×300	259	1500	1.0	60	0.97	50.0	6.60
SFDSC-1.5/60-0.97	150×300	259	1500	1.5	60	0.97	48.6	6.62
SFDSC-2.0/60-0.97	150×300	259	1500	2.0	60	0.97	48.1	7.30

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表 7 SFDSC待测梁的力学性能

Table 7. Mechanical properties of SFDSC beams

Number	E_c($ {E}_{\mathrm{s}\mathrm{f}\mathrm{r}\mathrm{c}} $)/GPa	M_cr/(kN·m)	M'/(kN·m)	B_fs/(N·mm²)	f/mm
SFDSC-0/40-0.97	34.11	11.48	43.26	4552305379540	2.28
SFDSC-0.5/60-0.97	34.38	12.83	46.42	4967398655727	2.24
SFDSC-1.0/60-0.97	34.13	14.92	51.26	5361077255435	2.29
SFDSC-1.5/60-0.97	33.81	17.01	55.69	5747548606608	2.32
SFDSC-2.0/60-0.97	33.69	19.09	59.83	6142795102906	2.33

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