超低温对超高韧性水泥基复合材料抗压韧性影响试验

苏骏; 钱维民; 郭锋; 赵家玉

doi:10.13801/j.cnki.fhclxb.20210223.002

超低温对超高韧性水泥基复合材料抗压韧性影响试验

doi: 10.13801/j.cnki.fhclxb.20210223.002

苏骏^{1, 2,},
钱维民^1, ,,
郭锋^1,,
赵家玉^1,

1.
湖北工业大学　土木建筑与环境学院，武汉 430068
2.
湖北工业大学　工程技术学院，武汉 430068

基金项目: 湖北省自然科学基金(2020CFB860)

详细信息

通讯作者:
钱维民，硕士，研究方向为纤维混凝土基本性能　E-mail：907415610@qq.com

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-18
- 录用日期: 2021-02-02
- 网络出版日期: 2021-02-23
- 刊出日期: 2021-12-01

Experimental study on the influence of ultra-low temperature on compressive toughness of ultra high toughness cementitious composites

SU Jun^{1, 2
,},
QIAN Weimin^{1
, ,},
GUO Feng^1
,,
ZHAO Jiayu^1
,

1.
School of Civil Engineering and Environment, Hubei University of Technology, Wuhan 430068, China
2.
Engineering and Technology College, Hubei University of Technology, Wuhan 430068, China

摘要

摘要: 超高韧性水泥基复合材料(UHTCC)是一种具有超高韧性及良好耐久性能的新型复合材料，其抗压韧性是评价其工作性能的重要指标。通过对5组不同纤维掺量的UHTCC在超低温作用后的单轴受压试验，研究超低温作用下UHTCC的抗压韧性评价指标，并对其变形能力进行等效分析，为UHTCC在超低温环境下的工程应用提供理论支持。研究结果表明：在一定范围内，随着纤维体积掺量的增加，UHTCC的抗压强度、抗压韧性均有明显提升，而超出最优掺量后性能反而略有下降；超低温对于UHTCC的抗压强度具有一定的提升作用，当温度降低至−196℃，其轴向抗压强度最大可提升约74.42%，但其脆性性能更明显。
- 超低温 /
- UHTCC /
- 单轴受压 /
- 抗压韧性 /
- 纤维体积掺量
Abstract: Ultra high toughness cementitious composites (UHTCC) is a new material with ultra-high toughness and good durability. Its compressive toughness index is an important index to evaluate the toughness of UHTCC. 5 groups of UHTCC with different fiber contents were tested under uniaxial compression after ultra-low temperature, and the evaluation index of compressive toughness of UHTCC under ultra-low temperature was studied, and its deformation capacity was equivalent analyzed. The experimental results show that within a certain range, with the increase of fiber content, the compressive strength and toughness of UHTCC are significantly improved, but beyond the optimal content range, the performances are not improved, but are slightly decreased; ultra-low temperature has a certain improvement on the compressive strength of UHTCC, when the temperature is reduced to −196℃, the axial compressive strength can be increased by 74.42%, but it shows obvious fragility.
- ultra low temperature /
- UHTCC /
- uniaxial compression /
- compressive toughness /
- fiber volume content

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图 1 低温试验设备与低温处理后试件形态

Figure 1. Cryogenic equipment and specimen shape after cryogenic treatment

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图 2 试验加载装置

Figure 2. Test loading device

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图 3 不同纤维体积掺量的UHTCC破坏形态

Figure 3. UHTCC failure morphologies with different fiber volume contents

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图 4 UHTCC的单轴受压荷载-变形曲线

Figure 4. UHTCC uniaxial compression load-deformation curves

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图 5 UHTCC抗压强度与温度变化关系

Figure 5. Relationship between compressive strength of UHTCC and temperature change

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图 6 不同因素对UHTCC变形能的影响

Figure 6. Influence of different factors on the deformation energy of UHTCC

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图 7 不同因素对UHTCC纤维增强韧性指标影响

Figure 7. Influence of different factors on fiber reinforced toughness of UHTCC

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图 8 不同因素对UHTCC残余韧性指数影响

Figure 8. Influence of different factors on residual toughness index of UHTCC

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表 1 聚乙烯醇(PVA)纤维性能指标

Table 1. Polyvinyl alcohol (PVA) fiber performance index

Name	Density/(g·cm⁻³)	Diameter/mm	Length/mm	Elastic modulus/MPa	Tensile strength/MPa	Elongation/%
REC15×12	1.3	0.04	12	120	526	6

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表 2 超高韧性水泥基复合材料(UHTCC)配合比及试验分组

Table 2. Ultra high toughness cementitious composites (UHTCC) mix proportion and test grouping

Specimen	Volume fraction of PVA fiber/vol%	Temperature/℃	Fly ash/ (kg·m⁻³)	Cement/ (kg·m⁻³)	Sand/ (kg·m⁻³)	Silica fume/ (kg·m⁻³)
C30	0	20/0/−50/−100/−150/−196	533.3	120	133.3	13.3
0.5vol%PVA/C30	0.5	20/0/−50/−100/−150/−196	533.3	120	133.3	13.3
1.0vol%PVA/C30	1.0	20/0/−50/−100/−150/−196	533.3	120	133.3	13.3
1.5vol%PVA/C30	1.5	20/0/−50/−100/−150/−196	533.3	120	133.3	13.3
2.0vol%PVA/C30	2.0	20/0/−50/−100/−150/−196	533.3	120	133.3	13.3

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表 3 各UHTCC试件平均抗压强度试验值

Table 3. Average compressive strength test values of UHTCC specimens MPa

Action temperature	20℃	0℃	−50℃	−100℃	−150℃	−196℃
Measured temperature	20℃	0℃	−50℃	−98.2℃	−132.2℃	−162.8℃
C30	27.648	27.080	28.904	32.984	34.584	31.384
0.5vol%PVA/C30	29.288	28.976	32.968	35.296	36.168	35.464
1.0vol%PVA/C30	32.920	34.048	46.840	48.984	54.864	57.424
1.5vol%PVA/C30	30.352	32.312	33.688	39.760	43.368	42.552
2.0vol%PVA/C30	29.152	29.448	29.920	33.696	35.792	31.456

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表 4 各阶段荷载及UHTCC相应变形

Table 4. Load and corresponding deformation of UHTCC at each stage

Specimen	Temperature/℃	Cracking deformation δ_c/mm	Cracking load/kN	Peak deformation/mm	Peak load/kN
C30	20	−	−	1.01	276.48
	0	−	−	1.02	270.80
	−50	−	−	1.02	289.04
	−100	−	−	1.08	329.84
	−150	−	−	1.14	345.84
	−196	−	−	1.01	313.84
0.5vol%PVA/C30	20	0.452	112.72	1.01	292.88
	0	0.483	105.86	1.01	289.76
	−50	0.574	129.43	1.12	329.68
	−100	0.694	152.31	1.24	352.96
	−150	0.691	136.19	1.34	361.68
	−196	0.694	146.58	1.35	354.64
1.0vol%PVA/C30	20	0.582	107.45	1.24	329.20
	0	0.683	128.04	1.34	340.48
	−50	0.716	156.30	1.35	468.40
	−100	0.793	169.63	1.56	489.84
	−150	0.804	174.05	1.46	548.64
	−196	0.911	245.98	1.57	574.24
1.5vol%PVA/C30	20	0.683	111.13	1.23	303.52
	0	0.684	113.92	1.23	323.12
	−50	0.815	129.48	1.36	336.88
	−100	0.784	157.38	1.56	397.60
	−150	0.682	162.77	1.45	433.68
	−196	0.622	158.41	1.24	425.52
2.0vol%PVA/C30	20	0.582	92.68	1.24	291.52
	0	0.692	105.48	1.24	294.48
	−50	0.794	111.88	1.35	299.20
	−100	0.911	122.42	1.35	336.96
	−150	0.914	141.10	1.46	357.92
	−196	0.816	115.73	1.46	314.56

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表 5 不同影响因素下的UHTCC等效抗压强度及变形能

Table 5. UHTCC equivalent compressive strength and deformation energy under different influencing factors

Specimen	Temperature/℃	Equivalent compressive strength/MPa			Modified equivalent compressive strength			Deformation energy
Specimen	Temperature/℃	u=0.85	u=0.5	u=0.2	u=0.85	u=0.5	u=0.2	$ {A}_{1} $	$ {A}_{3}^{1} $	$ {A}_{5.5}^{1} $	$ {A}_{10}^{1} $
C30	20	15.99	16.09	15.14	0.069	0.080	0.086	262.62	−	−	−
	0	15.95	15.99	15.19	0.065	0.074	0.078	238.36	−	−	−
	−50	15.36	15.65	15.12	0.057	0.063	0.067	203.23	−	−	−
	−100	18.28	18.49	18.32	0.071	0.078	0.081	239.75	−	−	−
	−150	19.10	19.27	19.25	0.076	0.080	0.081	244.80	−	−	−
	−196	16.64	16.84	16.63	0.059	0.064	0.066	198.57	−	−	−
0.5vol%PVA/C30	20	18.54	18.67	13.59	0.091	0.138	0.225	20.38	203.54	410.9	601.35
	0	16.94	17.69	12.38	0.077	0.120	0.200	23.07	228.13	381.51	575.90
	−50	17.89	18.28	12.90	0.085	0.107	0.209	38.22	277.60	410.58	590.23
	−100	17.53	18.26	11.96	0.078	0.096	0.194	46.42	306.29	432.35	536.75
	−150	18.21	18.52	12.61	0.092	0.101	0.208	45.92	313.43	451.58	578.76
	−196	17.93	18.44	12.67	0.088	0.100	0.206	49.81	310.54	444.52	567.76
1.0vol%PVA/C30	20	18.73	19.25	14.12	0.108	0.147	0.234	32.83	295.87	487.26	687.56
	0	18.25	19.25	14.00	0.095	0.135	0.227	42.06	353.44	511.43	638.39
	−50	23.79	24.25	16.80	0.133	0.150	0.278	55.94	448.87	623.95	779.93
	−100	24.40	24.71	16.17	0.141	0.153	0.262	71.49	463.85	637.40	714.27
	−150	25.28	26.05	17.08	0.141	0.153	0.284	70.92	492.25	684.66	779.96
	−196	26.58	27.30	17.22	0.154	0.168	0.279	89.00	541.76	722.85	748.39
1.5vol%PVA/C30	20	17.59	17.79	13.49	0.098	0.142	0.223	35.78	333.70	509.73	634.45
	0	17.06	17.81	13.11	0.090	0.126	0.212	35.85	330.93	489.98	602.15
	−50	16.57	17.08	12.46	0.093	0.108	0.203	51.53	341.55	489.28	556.85
	−100	19.93	20.10	13.23	0.114	0.121	0.220	51.80	378.65	517.2	606.98
	−150	21.67	22.07	13.18	0.110	0.119	0.214	48.06	368.91	488.51	592.85
	−196	21.16	21.55	12.74	0.098	0.106	0.206	36.96	334.42	446.67	582.21
2.0vol%PVA/C30	20	16.73	17.38	13.93	0.095	0.162	0.231	25.32	269.03	476.88	667.32
	0	14.98	16.47	12.33	0.077	0.124	0.200	34.96	308.68	467.12	564.32
	−50	14.20	15.19	10.90	0.073	0.099	0.177	44.67	306.16	433.97	486.11
	−100	13.64	14.28	9.37	0.071	0.085	0.155	49.49	291.86	395.82	416.37
	−150	15.15	15.93	9.67	0.082	0.096	0.160	55.82	315.77	408.47	425.75
	−196	14.37	15.04	8.97	0.073	0.085	0.149	50.75	274.66	356.86	396.01
Notes：u—Load when the load drops to u times the ultimate load; $ {A}_{n}^{1} $—Absorbed energy after cracking of UHTCC with different deformation degrees.

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表 6 UHTCC纤维增强韧性指标R与残余韧性指标R_c

Table 6. Fiber reinforced toughness index R and residual toughness index R_cin UHTCC

Specimen	Temperature/℃	A_UHTCC	A_JT	A_fz	Fiber reinforced toughness index R	Residual toughness index R_c
C30	20	−	−	−	−	−
	0	−	−	−	−	−
	−50	−	−	−	−	−
	−100	−	−	−	−	−
	−150	−	−	−	−	−
	−196	−	−	−	−	−
0.5vol%PVA/C30	20	675.32	262.62	155.56	2.57	2.94
	0	601.23	238.36	140.43	2.52	2.28
	−50	628.45	203.24	164.44	3.09	1.86
	−100	583.17	239.76	201.31	2.43	1.03
	−150	624.68	244.81	221.98	2.55	1.43
	−196	617.57	198.58	225.82	3.11	0.98
1.0vol%PVA/C30	20	702.39	262.62	176.86	2.67	2.97
	0	680.45	238.36	217.17	2.85	2.13
	−50	835.87	203.24	258.82	4.11	2.23
	−100	785.76	239.76	343.27	3.28	1.29
	−150	850.88	244.81	320.75	3.48	1.65
	−196	837.39	198.58	369.19	4.22	1.27
1.5vol%PVA/C30	20	670.23	262.62	166.64	2.55	3.02
	0	638.00	238.36	159.47	2.68	3.00
	−50	608.38	203.24	179.57	2.99	2.39
	−100	658.78	239.76	286.30	2.75	1.30
	−150	640.90	244.81	259.05	2.62	1.47
	−196	619.17	198.58	235.09	3.12	1.63
2.0vol%PVA/C30	20	692.64	262.62	159.78	2.64	3.33
	0	599.28	238.36	147.07	2.51	3.07
	−50	530.78	203.24	163.73	2.61	2.24
	−100	465.86	239.76	152.17	1.94	2.06
	−150	481.57	244.81	197.89	1.97	1.43
	−196	446.76	198.58	165.76	2.25	1.70
Notes：A_UHTCC—Area under the curve calculated from the peak load corresponding to five times the deformation as the limit point of the residual toughness; A_JT—Toughness after ignoring the peak of the matrix, and the area under the load-deformation curve corresponding to the peak point is taken as the energy absorption value of the matrix; A_fz—Area under the corresponding curve when the load-deformation curve reaches the peak load.

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