玄武岩纤维对再生混凝土抗碳化性能的影响

丁亚红; 郭书奇; 张向冈; 徐平; 武军; 张美香

doi:10.13801/j.cnki.fhclxb.20210520.002

玄武岩纤维对再生混凝土抗碳化性能的影响

doi: 10.13801/j.cnki.fhclxb.20210520.002

丁亚红^1,,
郭书奇^1,,
张向冈^{1, 2, ,},
徐平^1,,
武军^1,,
张美香^1,

1.
河南理工大学　土木工程学院，焦作 454000
2.
河南省特种防护材料重点实验室，洛阳 471023

基金项目: 国家自然科学基金(U1904188)；河南省重点研发与推广专项(212102310288)；河南省特种防护材料重点实验室开放课题(SZKFJJ202004)；河南省高校基本科研业务费专项(NSFRF200320)

详细信息

通讯作者:
张向冈，博士，副教授，研究方向为再生混凝土、钢与混凝土组合结构　E-mail：xgzhang1986@126.com

中图分类号: TV431+3
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出版历程
- 收稿日期: 2021-03-17
- 修回日期: 2021-05-10
- 录用日期: 2021-05-11
- 网络出版日期: 2021-05-20
- 刊出日期: 2021-03-01

Influence of basalt fiber on the anti-carbonation performance of recycled aggregate concrete

DING Yahong^1
,,
GUO Shuqi^1
,,
ZHANG Xianggang^{1, 2
, ,},
XU Ping^1
,,
WU Jun^1
,,
ZHANG Meixiang^1
,

1.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2.
Henan Key Laboratory of Special Protective Materials, Luoyang 471023, China

摘要

摘要: 采用快速碳化的方法研究了玄武岩纤维（BF）掺量和再生粗骨料（RCA）取代率对再生混凝土（RAC）抗碳化性能的影响，实测了3天、7天、14天、28天的碳化深度，对随碳化天数的增加，碳化深度与BF掺量、RCA取代率之间的关系进行了分析。结果表明，RAC的碳化与天然混凝土（NAC）类似，其碳化深度均随碳化天数的增加而增加，随着RCA取代率的增加，RAC的碳化深度先降后增，当RCA的质量取代率为50%时，RAC的抗碳化性能最佳，掺入BF可以有效地提高RAC的抗碳化性能，随着BF掺量的增加，RAC的抗碳化性能先增后减，最佳掺量为2 kg/m³。另外，采用扫描电子显微镜对BF/RAC的微观结构进行观测，结合扩散理论，揭示了碳化损伤机制。利用试验数据进行拟合，建立了BF/RAC的碳化深度模型。研究成果对今后开展BF/RAC抗碳化性能的研究及工程应用具有一定的参考价值。
- 再生混凝土 /
- 玄武岩纤维 /
- 碳化深度 /
- 微观结构 /
- 碳化模型
Abstract: The rapid carbonization method was used to study the influence of basalt fiber (BF) content and recycled coarse aggregate (RCA) replacement ratio on the anti-carbonization performance of recycled aggregate concrete (RAC). The carbonization depth of 3 days, 7 days, 14 days and 28 days was measured, and the relationship between carbonization depth with BF content and replacement ratio of RCA was analyzed with the increase of carbonization days. The results show that the carbonization of RAC is similar to that of natural aggregate concrete (NAC). The depth of carbonization increases with the increase of carbonization days. As the replacement ratio of RCA increases, the carbonization depth of RAC first decreases and then increases, when the RCA mass replacement ratio is 50%, the carbonization resistance of RAC is the best. Incorporating BF can effectively improve the anti-carbonization performance of RAC. With the increase of BF content, the anti-carbonization performance of RAC increases first and then decreases. In this experiment, the optimal content of RAC is 2 kg/m³. In addition, using scanning electron microscope to observe the microstructure of BF/RAC, combined with diffusion theory, the carbonization damage mechanism was revealed. Using test data for fitting, a carbonization depth model of BF/RAC was established. The research results have reference value for future research and engineering applications.
- recycled aggregate concrete /
- basalt fiber /
- carbonization depth /
- micro structure /
- carbonization model

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图 1 碳化试验

Figure 1. Carbonization test

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图 2 不同RCA取代率下BF/RAC碳化深度与碳化龄期的关系

Figure 2. Relationship between carbonization depth and carbonization days of BF/RAC with different RCA substitution ratios

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图 3 不同BF掺量下BF/RAC碳化深度与碳化时间的关系

Figure 3. Relationship between carbonization depth and carbonization days of BF/RAC with different BF contents

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图 4 碳化过程中BF/RAC的SEM图像

Figure 4. SEM images of BF/RAC during carbonization

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图 5 不同RCA取代率下BF/RAC碳化拟合图像

Figure 5. BF/RAC carbonization fitting image with different RCA substitution ratios

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图 6 BF/RAC A值的拟合图像

Figure 6. Fitted image of A value of BF/RAC

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表 1 玄武岩纤维(BF)性能指标

Table 1. Performance index of basalt fiber (BF)

One-dimensional diameter/µm	Length/mm	Density/(g·cm⁻³)	Elongation at break/%	Tensile strength/MPa	Elastic modulus/GPa
1.3	18	2.65	2.7	3500	80

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表 2 BF/再生混凝土 (RAC) 配合比 (kg/m³)

Table 2. Mixture proportion of BF/recycled aggregate concrete (RAC) (kg/m³)

Group	Cement	Fly ash	Silica fume	Sand	RCA/mm		NCA/mm		Water-reducing agent	BF
Group	Cement	Fly ash	Silica fume	Sand	5-10	10-20	5-10	10-20	Water-reducing agent	BF
NAC	380	40	74	655	0	0	328	655	4.9	0
2BF/NAC	380	40	74	655	0	0	328	655	4.9	2
4BF/NAC	380	40	74	655	0	0	328	655	4.9	4
6BF/NAC	380	40	74	655	0	0	328	655	4.9	6
RAC(50%RCA)	380	40	74	655	163	327	163	327	4.9	0
2BF/RAC(50%RCA)	380	40	74	655	163	327	163	327	4.9	2
4BF/RAC(50%RCA)	380	40	74	655	163	327	163	327	4.9	4
6BF/RAC(50%RCA)	380	40	74	655	163	327	163	327	4.9	6
RAC(100%RCA)	380	40	74	655	328	655	0	0	4.9	0
2BF/RAC(100%RCA)	380	40	74	655	328	655	0	0	4.9	2
4BF/RAC(100%RCA)	380	40	74	655	328	655	0	0	4.9	4
6BF/RAC(100%RCA)	380	40	74	655	328	655	0	0	4.9	6
Notes：NAC—Natural aggregate concrete; BF—Basalt fiber; RAC—Recycled aggregate concrete; RCA—Recycled coarse aggregate; NCA—Natural coarse aggregate; 2BF/NAC, 4BF/NAC, 6BF/NAC—Mixing 2, 4, 6 kg/m³ BF into NAC, respectively; RAC(50%RCA), 2BF/RAC(50%RCA), 4BF/RAC(50%RCA), 6BF/RAC(50%RCA)—Mixing 0, 2, 4, 6 kg/m³ BF into RAC with 50% replacement ratio of RCA, respectively; RAC(100%RCA), 2BF/RAC(100%RCA), 4BF/RAC(100%RCA), 6BF/RAC(100%RCA)—Mixing 0, 2, 4, 6 kg/m³ BF into RAC with 100% replacement ratio of RCA, respectively.

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表 3 BF/RAC的碳化深度

Table 3. Carbonization depth of BF/RAC

Project	3 Days	7 Days	14 Days	28 Days
NAC	5.82	6.70	7.47	8.73
2BF/NAC	3.95	4.12	4.32	5.30
4BF/NAC	1.83	3.43	3.82	4.77
6BF/NAC	1.53	4.85	5.53	7.43
RAC(50%RCA)	3.09	3.16	6.00	7.61
2BF/RAC(50%RCA)	2.18	3.24	5.46	6.08
4BF/RAC(50%RCA)	3.47	5.54	5.92	7.21
6BF/RAC(50%RCA)	2.71	6.53	6.70	9.79
RAC(100%RCA)	4.21	8.06	9.90	10.15
2BF/RAC(100%RCA)	5.77	7.98	8.62	9.58
4BF/RAC(100%RCA)	5.17	8.75	10.32	10.79
6BF/RAC(100%RCA)	6.36	10.85	11.21	13.05

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表 4 BF/RAC碳化深度拟合参数

Table 4. BF/RAC carbonization depth fitting parameters

Project	A	R²
NAC	1.960	0.763
2BF/NAC	1.191	0.670
4BF/NAC	0.997	0.936
6BF/NAC	1.452	0.944
RAC(50%RCA)	1.470	0.968
2BF/RAC(50%RCA)	1.249	0.963
4BF/RAC(50%RCA)	1.557	0.884
6BF/RAC(50%RCA)	1.901	0.951
RAC(100%RCA)	2.296	0.870
2BF/RAC(100%RCA)	2.193	0.780
4BF/RAC(100%RCA)	2.458	0.851
6BF/RAC(100%RCA)	2.899	0.843
Notes：A—Carbonization ratio coefficient; R²—Coefficient of determination.

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表 5 BF/RAC A值的拟合参数

Table 5. Fitting parameters of A value of BF/RAC

RCA substitution ratio	a	b	c	R²
0%	0.08	−0.55	1.96	0.998
50%	0.04	−0.13	1.45	0.833
100%	0.03	−0.10	2.29	0.981

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表 6 BF/RAC碳化深度模型

Table 6. BF/RAC carbonization depth model

RCA substitution ratio	Carbonization depth model of BF/RAC
0%	$Y = (0.077{m^2} - 0.545m + 1.964)\sqrt x $
50%	$Y = (0.035{m^2} - 0.131m + 1.445)\sqrt x $
100%	$Y = (0.034{m^2} - 0.1m + 2.286)\sqrt x $

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表 7 RAC碳化深度模型对比

Table 7. Comparison of carbonization depth models of RAC

Specimen	Time/d	Actual value	Calculated value			Calculated value/Actual value
Specimen	Time/d	Actual value	This study	Xiao’s model^[30]	Geng’s model^[13]	This study	Xiao’s model^[30]	Geng’s model^[13]
NAC	3	5.82	3.37	1.31	6.50	0.58	0.23	1.12
	7	6.70	5.15	2.01	8.69	0.77	0.30	1.30
	14	7.47	7.28	2.84	11.01	0.97	0.38	1.47
	28	8.73	10.30	4.02	13.96	1.18	0.46	1.60
RAC(50%RCA)	3	3.09	2.50	1.64	6.59	0.81	0.53	2.13
	7	3.16	3.82	2.51	8.81	1.21	0.79	2.79
	14	6.00	5.41	3.55	11.16	0.90	0.59	1.86
	28	7.61	7.65	5.02	14.15	1.00	0.66	1.86
RAC(100%RCA)	3	4.21	3.96	1.97	6.68	0.94	0.47	1.59
	7	8.06	6.05	3.01	8.93	0.75	0.37	1.11
	14	9.90	8.55	4.26	11.31	0.86	0.43	1.14
	28	10.15	12.10	6.02	14.34	1.19	0.59	1.41

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