Constitutive Model and Blast Resistance Test of Concrete under Low/Room Temperature Curing

doi:10.12382/bgxb.2022.1019

Abstract

Abstract:

The mechanical properties of concrete materials are closely related to the curing environment. Limited by the construction environment, some concrete structures are poured and formed at high altitudes or in cold, low-temperature conditions. In this work, several uniaxial compressive tests are conducted on concrete specimens cured at both low and room temperatures to study their mechanical properties and blast resistance. Based on the results of these tests, the damage evolution function related to the length of curing is introduced, the plastic flow factor is modified and the constitutive model of concrete under low/room temperature curing is established to predict the mechanical properties of concrete. Blast impact tests of concrete are conducted to compare the blast resistance of concrete blocks under low/room temperature curing. The research results show that: the compressive strength of concrete materials under low-temperature curing is about 34.6%~56.8% of that under room temperature curing. Compressive strength is positively correlated with the length of curing and negatively correlated with the internal moisture of the specimens. The mechanical properties of concrete under low/room temperature curing can be effectively predicted by the established concrete constitutive model. The blast resistance of concrete formed by low-temperature curing is reduced, but it still exhibits notable blast resistance capabilities.

Key words: concrete, low/room temperature curing, compressive strength, internal moisture, constitutive model, blast resistance test

CLC Number:

O385
TJ012.4

NING Jianguo, YANG Shuai, LI Yuhui, XU Xiangzhao. Constitutive Model and Blast Resistance Test of Concrete under Low/Room Temperature Curing[J]. Acta Armamentarii, 2023, 44(10): 2932-2943.

Figures/Tables 17

Fig.1 Concrete specimens for testing

Fig.2 Test equipment

Fig.3 Damage morphologies of concrete under normal temperature curing

Fig.4 Damage morphologies of concrete under low-temperature curing (-10℃)

Table 1 Compressive strength of concrete undernormal temperature curing

试件编号	试件质量/g	试件尺寸 (长×宽×高)/ mm³	抗压强度/ MPa	标准抗压强度/ MPa	平均抗压强度/ MPa
30-1	2288	99×99×101	26.28	24.97
30-2	2289	99×100×99	29.38	27.91
30-3	2265	99×101×99	30.91	29.36
30-4	2242	100×100×100	29.60	28.12	29.40
30-5	2291	98×100×100	31.87	30.28
30-6	2230	98×102×97	29.74	28.25
30-7	2231	100×101×99	36.80	34.96
30-8	2267	99×100×100	33.01	31.36

Fig.5 Relationship between standard compressive strength and normal curing time

Fig.6 Comparison of compressive strengths under low-temperature/normal temperature curing

Table 2 Variation of specimen parameters under different curing days

养护天数/d	质量损失/g	含水率降幅/%	抗压强度/MPa
	0	0	11.67
28(低温)	0	0	8.57
	0	0	10.25
	92	4.06	11.70
40(常温)	63	2.63	13.33
	66	2.79	13.61
	74	3.19	14.64
47(常温)	78	3.30	14.63
	95	4.08	14.50
57(常温)	121	5.33	14.68
	125	5.52	14.67
	147	6.17	17.99
71(常温)	141	5.95	15.82
	149	6.13	17.95
	167	6.62	16.50
85(常温)	180	7.62	15.43
	169	6.78	16.86
99(常温)	179	7.05	16.06
	183	7.42	17.41

Fig.7 Stress-strain curves under different curing conditions

Fig.8 Relationship between standard compressive strength and water content drop

Fig.9 Damage evolution law of concrete after low-temperature curing for 28 days

Table 3 Parameters of concrete materials after subjecting to different lengths of curing

试验	E/GPa	σ_s0/MPa	ε_m	σ_m/MPa
T28	6.035	10.876	2.4×10^-3	12.281
T57	11.276	12.146	1.6×10^-3	15.405
T85	19.724	14.708	1.2×10^-3	17.368

Table 4 Parameters in the concrete constitutive model

试验	a	b	η	h	n_p
T28	102.34	2.69	3.74×10^-5	5.78×10³
T57	192.56	2.03	2.25×10^-5	6.12×10³	2.1
T85	289.47	1.78	2.18×10^-5	6.47×10³

Fig.10 Comparison of stress-strain relationship with different curing lengths

Fig.11 Test setup

Fig.12 Explosive effects of concrete block under room temperature curing

Fig.13 Explosive effects of concrete block under low-temperature curing

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