基于核磁共振技术的硫酸盐侵蚀下混凝土孔隙率发展规律分析

doi:10.3976/j.issn.1002-4026.2022.01.009

Abstract

Abstract:

To determine the degradation pattern of pore structures during concrete damage under different sulfate mass fraction, the freeze-thaw cycle test of concrete under different sulfate mass fraction is performed herein. Using nuclear magnetic resonance technology, the change in porosity during concrete damage is analyzed, in addition to the mass loss and relative dynamic elastic modulus change. The results show that the first peak of T₂ spectrum changes significantly under different sulfate mass fraction. In the same period of the freeze-thaw cycle, the change range of the T₂ spectrum first peak increases with increase in the sulfate mass fraction. An exponential relation exists between the first peak area of T₂ spectrum and the number of freeze-thaw cycles in the salt-freezing environment, and a linear relation exists in the water-freezing environment. There is a linear relation between the development of microporosity and the number of freeze-thaw cycles. There is a significant linear relationship between the porosity and the number of freeze-thaw cycles and sulfate mass fraction. The mass loss and the relative dynamic elastic modulus loss in the salt-freezing environment increase with increase in the sulfate mass fraction.

Key words: concrete, sulfate attack, nuclear magnetic resonance, T₂ spectrum, freeze-thaw cycle, porosity

CLC Number:

TU528

WANG Cheng-ping,ZHANG Jia-sheng. Porosity development analysis of concrete under sulfate attack based on nuclear magnetic resonance[J].Shandong Science, 2022, 35(1): 65-72.

Figures/Tables 15

Table 1

Table 2

Table 3

Fig.1

Table 4

Fig.2

Table 5

First peak area and area proportion fitting function of T2 spectrum"

编号	第一峰面积拟合式	第一峰面积占比拟合式
A	$y a = 2.666 N + 1638$ ,R²=0.97	$y ap = 73 e 4.992 × 10 - 4 × N - 1.86 × 10 - 4 e - 5.029 × 10 - 2 × N$ ,R²=0.98
B	$y a = 2401 e - 9.7 × 10 - 6 × N - 700 e - 1.16 × 10 - 2 × N$ ,R²=0.98	$y ap = - 1.38 × 106 e - 2.70 × 10 - 3 × N + 1.38 × 106 e - 2.70 × 10 - 3 × N$ ,R²=0.93
C	$y a = 2602 e - 1.68 × 10 - 4 × N - 918.1 e - 1.16 × 10 - 2 × N$ ,R²=0.99	$y ap = - 2.624 × 10 6 \ 4 e - 2.78 × 10 - 3 × N + 2.631 × 104 e - 2.766 × 10 - 3 × N$ ,R²=0.90
D	$y a = 2288 e - 4.34 × 10 - 4 × N - 543.7 e - 2.80 × 10 - 2 × N$ ,R²=0.99	$y ap = - 1.62 × 104 e - 2.68 × 10 - 3 × N + 1.627 × 104 e - 2.66 × 10 - 3 × N$ ,R²=0.97

Table 5

Table 6

Table 7

Fitting function of the porosity and number of freeze-thaw cycles"

分组	拟合式	R²
A	$y pA = 0.006509 N + 2.428$	0.98
B	$y pB = 0.002273 N + 2.432$	0.99
C	$y pC = 0.007446 N + 2.498$	0.99
D	$y pD = 0.008063 N + 2.510$	0.99

Table 7

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

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原材料	抗压强度/MPa			抗折强度/MPa			凝结时间/min
原材料	3 d	28 d		3 d	28 d		初凝	终凝
水泥	24.31	47.62		5.23	7.69		112	202

原材料	ρ(SiO₂)	ρ(CaO)	ρ(Fe₂O₃)	ρ(Al₂O₃)	ρ(MgO)	ρ(SO₃)	ρ(K₂O)	ρ(Na₂O)	ρ(TiO₂)	ρ(MnO)	烧失量
水泥	22.49	55.1	9.82	4.26	3.48	1.83	1.05	0.33	0.24	—	1.40
粉煤灰	41.96	21.18	8.53	21.34	1.42	1.42	1.21	—	—	0.62	2.32
矿粉	33.52	35.38	1.35	12.22	11.25	0.76	0.63	—	2.17	0.41	2.31

	编号	循环次数
	编号	0	50	100	150	200	250
T₂谱总面积	A	1 688.4	1 736.6	1 847.7	2 055.2	2 196.5	2 304.1
	B	1 695.7	2 034.6	2 122.5	2 323.7	2 310.5	2 356.4
	C	1 679.2	2 088.5	2 231.6	2 401.5	2 427.4	2 439.4
	D	1 743.8	2 213.6	2 328.2	2 466.6	2 484.3	2 548.7
T₂谱第一峰占比/%	A	73.22	74.76	76.23	79.08	80.17	77.31
	B	73.51	79.27	80.34	81.14	82.11	78.32
	C	74.14	80.35	81.25	82.16	83.53	79.03
	D	75.22	81.21	82.36	83.98	83.67	81.03

分组	循环次数
分组	0	50	100	150	200	250
A	2.53	2.75	2.96	3.34	3.72	4.15
B	2.49	2.81	3.12	3.45	3.86	4.36
C	2.52	2.86	3.28	3.54	3.95	4.42
D	2.51	2.93	3.31	3.67	4.18	4.51

Porosity development analysis of concrete under sulfate attack based on nuclear magnetic resonance

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