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

Abstract

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

CLC Number:

TQ172

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.

Figures/Tables 11

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References 17

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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

试件	数值/（kg·m^-3）
纤维	26
水	420.39
砂	552.51
水泥	600.55
粉煤灰	600.55
减水剂	1.20

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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Self-healing properties with different environments of ECC prepared with desert sand

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