沙漠砂制备高韧性水泥基复合材料在不同环境下的自愈合性能

doi:10.13229/j.cnki.jdxbgxb.20220236

摘要/Abstract

摘要：

分别采用毛乌素沙漠砂和腾格里沙漠砂为细集料制备高韧性水泥基复合材料（DS-ECC），在1%、1.5%、2%的预加拉伸应变破坏下，研究了3、7、28 d龄期的DS-ECC试件在空气和干湿循环条件下裂缝特性、自愈合后拉伸性能及自愈合产物。研究结果表明：两种沙漠砂制备的DS-ECC试件均能发生自愈合现象，干湿循环条件下自愈合现象较空气条件更加明显；残余裂缝的最大减少量均发生在3 d龄期，毛乌素沙漠砂和腾格里沙漠砂制备的DS-ECC试件残余裂缝减少量分别为89.3%和80.9%；带裂缝的DS-ECC试件自愈合后极限拉应变大多高于未带裂缝试件的极限拉应变，但最终强度有所降低，相较于空气条件，干湿循环条件下的DS-ECC试件自愈合后极限拉应变较大，最终强度降低；DS-ECC自愈合及基体混合产物主要为SiO₂、Ca（OH）₂和CaCO₃。综合考虑DS-ECC的自愈合效果及自愈合后拉伸性能，毛乌素沙漠砂制备的DS-ECC试件自愈合性能较优。

关键词: 高韧性水泥基复合材料, 沙漠砂, 自愈合, 残余裂缝, 拉伸性能

Abstract:

Desert Sand engineered cementitious composite （DS-ECC） was prepared with MuSu desert sand and Tengger desert sand as fine aggregates， respectively. When the pre-tension strain failures is 1%， 1.5% and 2%， the crack characteristics， self-healing tensile properties and self-healing products in 3 d， 7 d and 28 d of DS-ECC specimens were studied under air and wet/dry cycles. The results show that DS-ECC specimens prepared with the two kinds of desert sands have good self-healing effect， which is more obvious under wet-dry cycle condition than that of the air conditions； the all maximum reduction of residual cracks occurs at 3 days， the reduction of residual cracks in DS-ECC specimens prepared with Mu Su desert sand and Tengger desert sand is 89.3% and 80.9%， respectively； The ultimate tensile strain of DS-ECC specimens with cracks after self-healing is mostly higher than that of without cracks， but the final strength is reduced in some extent， compared with air conditions， the ultimate tensile strain of DS-ECC specimen under wet-dry cycles is larger after self-healing， and the final strength is reduced； DS-ECC self-healing and matrix mixed are mainly SiO₂， Ca（OH）₂and CaCO₃. Considering the self-healing effect of DS-ECC and the tensile properties after self-healing， the DS-ECC specimens prepared from Mu Us desert sand have better self-healing properties.

Key words: engineered cementitious composite, desert sand, self-healing, residual cracks, tensile properties

中图分类号:

TQ172

车佳玲,王俊,刘海峰,张居平. 沙漠砂制备高韧性水泥基复合材料在不同环境下的自愈合性能[J]. 吉林大学学报(工学版), 2023, 53(8): 2277-2286.

Jia-ling CHE,Jun WANG,Hai-feng LIU,Ju-ping ZHANG. Self-healing properties with different environments of ECC prepared with desert sand[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(8): 2277-2286.

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种类	SiO₂	Al₂O₃	P₂O₅	SO₃	K₂O	TiO₂	Fe₂O₃	CaO
腾格里沙漠砂	70.80	13.10	1.72	1.03	3.63	0.62	4.62	3.57
毛乌素沙漠砂	74.20	12.30	0.80	0.50	2.62	0.49	3.69	4.83

物理量	数值
直径/μm	39
长度/mm	12
密度/（kg·m^-3）	1600
弹性模量/GPa	40
伸长率/%	6.42

样本编号	M-DS-ECC						T-DS-ECC
	裂缝数量				最大裂缝宽度/μm	裂缝总数	裂缝数量				最大裂缝宽度/μm	裂缝总数
	<10 μm	10~20 μm	20~30 μm	>30 μm	最大裂缝宽度/μm	裂缝总数	<10 μm	10~20 μm	20~30 μm	>30 μm	最大裂缝宽度/μm	裂缝总数
pre-1%-3 d-air	16	1	1	3	143.2	21	21	2	3	3	76.3	29
pre-1.5%-3 d-air	17	3	1	4	124.3	25	19	2	4	5	86.2	30
pre-2%-3 d-air	24	0	3	4	225.9	31	20	4	2	7	99.8	33
pre-1%-7 d-air	10	10	7	6	101.9	33	17	0	1	3	67.4	21
pre-1.5%-7 d-air	16	8	5	7	122.4	36	18	2	1	4	92.4	25
pre-2%-7 d-air	17	7	8	9	153.0	41	18	5	0	3	130.1	26
pre-1%-28 d-air	14	1	3	2	90.4	20	12	8	1	3	51.8	24
pre-1.5%-28 d-air	16	3	0	3	144.5	22	7	5	2	4	70.3	18
pre-2%-28 d-air	16	3	0	6	298.4	25	10	7	0	9	91.0	26
self-1%-3 d-air	5	0	0	3	124.9	8	8	2	2	3	65.2	15
self-1.5%-3 d-air	6	2	2	3	106.4	13	10	3	2	5	66.1	17
self-2%-3 d-air	7	0	3	4	209.4	14	9	3	1	5	91.9	18
self-1%-7 d-air	5	2	4	5	86.4	16	7	0	1	3	55.3	11
self-1.5%-7 d-air	6	4	5	6	102.1	21	8	2	1	3	79.7	14
self-2%-7 d-air	8	5	6	8	136.9	27	9	2	0	3	121.1	14
self-1%-28 d-air	5	1	2	2	71.4	10	6	5	1	1	38.2	13
self-1.5%-28 d-air	6	2	0	3	121.9	11	2	3	2	4	60.4	11
self-2%-28 d-air	5	2	3	3	288.4	13	3	5	3	6	80.6	17
pre-1%-3 d-w/d	19	3	3	3	42.1	28	15	3	0	3	92.7	21
pre-1.5%-3 d-w/d	15	3	1	3	47.3	22	23	1	1	6	76.2	31
pre-2%-3 d-w/d	22	2	2	3	130.9	29	19	3	3	4	81.6	29
pre-1%-7 d-w/d	18	3	1	4	117.0	26	15	1	1	2	84.5	19
pre-1.5%-7 d-w/d	19	1	2	5	111.0	27	16	1	1	3	101.4	21
pre-2%-7 d-w/d	16	4	5	10	127.0	35	16	4	2	4	171.6	26
pre-1%-28 d-w/d	14	2	2	3	127.2	21	14	5	2	3	34.5	24
pre-1.5%-28 d-w/d	17	2	2	3	154.3	24	16	3	2	5	69.4	26
pre-2%-28 d-w/d	18	2	1	5	201.9	26	19	2	3	10	102.0	34
self-1%-3 d-w/d	1	2	0	0	18.1	3	1	0	1	2	78.3	4
self-1.5%-3 d-w/d	1	1	1	0	20.3	3	2	2	0	4	57.5	8
self-2%-3 d-w/d	4	1	0	2	99.7	7	5	1	2	3	67.9	10
self-1%-7 d-w/d	3	0	2	3	90.9	8	2	0	0	2	71.4	4
self-1.5%-7 d-w/d	4	0	3	3	85.4	10	3	0	0	3	82.9	6
self-2%-7 d-w/d	3	2	3	8	100.4	16	4	0	1	3	145.2	8
self-1%-28 d-w/d	1	2	2	3	97.0	8	4	1	1	0	18.3	6
self-1.5%-28 d-w/d	3	2	1	1	127.0	7	3	1	0	5	55.4	9
self-2%-28 d-w/d	2	1	2	3	164.2	8	6	2	4	7	90.2	19

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