掺锂渣再生混凝土三点弯曲梁双K断裂特性

doi:10.13229/j.cnki.jdxbgxb20200590

Abstract

Abstract:

To study the effects of different lithium slag contents and recycled coarse aggregate percentages on the double-K fracture toughness of recycled concrete with lithium slag, 36 standard three-point bending beams of recycled concrete with lithium slag, which include 9 mix ratios about lithium slag content of 0%,10%,20% and recycled coarse aggregate percentage of 0%,30%,50%, were prepared for fracture test. Based on the analysis of crack propagation process, a prediction model for fracture toughness of concrete was proposed. The research results show that the double K fracture toughness of concrete all increases first and then decreases with the increase of the recycled coarse aggregate percentage. The addition of lithium slag can improve the double K fracture toughness of the concrete and offset the deficiency of the concrete fracture performance with high recycled coarse aggregate percentage. The double K properties are optimal when the lithium slag content and recycled coarse aggregate account for 20 % and 30 % respectively. The initial fracture toughness and unstable fracture toughness reach 0.54 MPa·m^1/2 and1.07 MPa·m^1/2, increasing by 42.1% and 23 % respectively compared with the reference group.

Key words: lithium slag, recycled coarse aggregate, three point bending beam, double-K fracture toughness

CLC Number:

TU528

Yong-jun QIN,Nan CHEN,Peng-jie LIN,Jiang YU. Double K fracture characteristics of recycled concrete three⁃point bending beam mixed with lithium slag[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 2121-2127.

Figures/Tables 12

Table 1

Table 2

Table 3

Fig.1

Fig.2

Fig.3

Table 4

Fracture parameters calculated by the double-K fracture model"

编号	试件数量	P_ini/kN	P_max/kN	CMOD/μm	E/GPa	a_c/mm	$K I c i n i$ /（MPa· $m 1 / 2$ ）	$K I c u n$ /（MPa· $m 1 / 2$
LS-RC-1	4	1.52	2.46	44.56	29.3	50	0.38	0.87
LS-RC-2	4	1.76	2.66	46.21	31.0	52	0.44	0.93
LS-RC-3	4	1.82	2.90	48.34	30.7	51	0.44	0.95
LS-RC-4	4	1.75	2.58	46.28	31.1	52	0.44	0.93
LS-RC-5	4	1.9	2.77	49.67	31.5	53	0.48	1.03
LS-RC-6	4	2.15	2.97	51.93	31.9	52	0.54	1.07
LS-RC-7	4	1.48	2.37	46.28	28.6	51	0.37	0.83
LS-RC-8	4	1.57	2.58	50.75	29.0	52	0.39	0.96
LS-RC-9	4	1.64	2.73	52.15	30.6	51	0.41	1.01

Table 4

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

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材料	CaO	SiO₂	Al₂O₃	Li₂O	Loss	Fe₂O₃	SO₃
水泥	60.23	21.26	5.03	-	2.17	3.24	2.65
锂渣	7.99	54.40	19.81	0.18	6.72	1.41	8.31

粗骨料类别	微粉含量/%	吸水率/%	针片状含量/%	坚固性/%	表观密度/（kg·m^-3）
天然	0.3	0.5	5	1	2640
再生	0.5	3.46	2	4.2	2825

编号	RC/%	LS/%	混凝土配合比/（kg·m^-3）							28 d抗压强度/MPa	劈裂拉强度/MPa
编号	RC/%	LS/%	锂渣	再生粗骨料	净用水	砂	卵石	水泥	附加用水	28 d抗压强度/MPa	劈裂拉强度/MPa
LS-RC-1	0	0	0	0	195	523.5	1221.4	433.0	0	34.72	3.38
LS-RC-2	0	10	43.3	0	195	523.5	1221.4	389.7	0	36.46	4.06
LS-RC-3	0	20	86.6	0	195	523.5	1221.4	346.4	0	40.58	4.27
LS-RC-4	30	0	0	366.4	195	523.5	854.9	433.0	7.84	42.09	3.82
LS-RC-5	30	10	43.3	366.4	195	523.5	854.9	389.7	7.84	44.62	4.23
LS-RC-6	30	20	86.6	366.4	195	523.5	854.9	346.4	7.84	47.53	4.38
LS-RC-7	50	0	0	610.7	195	523.5	610.7	433.0	13.07	37.24	3.56
LS-RC-8	50	10	43.4	610.7	195	523.5	610.7	389.7	13.07	40.86	4.03
LS-RC-9	50	20	86.6	610.7	195	523.5	610.7	346.4	13.07	42.83	4.19

Double K fracture characteristics of recycled concrete three⁃point bending beam mixed with lithium slag

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