荷载和高温对沙漠砂混凝土单轴抗压性能的影响

doi:10.13229/j.cnki.jdxbgxb.20221408

Abstract

Abstract:

In order to research on the mechanical properties of desert sand concrete （DSC） after high temperature， desert sand from Mu Us sandy land was used to partially replace medium sand to make DSC. The uniaxial compression experiments of DSC subjected to different loadings and temperatures were carried out to obtain the stress-strain curves. The influences of loading level， temperature and cooling methods on the mass loss rate， ultrasonic velocity and axial compressive properties were analyzed. Experimental results showed that the mass loss rate of DSC gradually increased with the temperature. The uniaxial compressive strength and modulus of elasticity of DSC declined， peak strain increased greatly， and the stress-strain curve gradually became flat. Taking into account of temperature and loading level， the constitutive model was established to simulate the mechanical properties of DSC based on the two-stage constitutive model， which provided technical support for the performance evaluation of DSC after high temperature.

Key words: desert sand concrete （DSC）, loading level, uniaxial compression, high temperature, stress-strain relation

CLC Number:

TU528

Hai-feng LIU,Ren-guang TAO,Jia-ling CHE,Wei-wu YANG,Li-chen ZHU. Influence of loading and high temperature on uniaxial compressive properties of desert sand concrete[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(9): 2609-2619.

Figures/Tables 22

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细度/%	标准稠度用水量/%	安定性	凝结时间/min		抗折强度/MPa		抗压强度/MPa
细度/%	标准稠度用水量/%	安定性	初凝	终凝	3 d	28 d	3 d	28 d
4.7	28	合格	134	173	6.5	8.4	33.2	54.1

骨料	细度模数	堆积密度/ （g·cm^-3）	表观密度/ （g·cm^-3）	含泥量/ %
沙漠砂	0.19	1.40	2.62	0.14
中砂	2.38	1.57	2.64	0.70
粗骨料	-	1.43	2.7	0.78

材料	筛孔尺寸/mm
材料	19	16	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.097	0.075	0.050
沙漠砂	-	-	-	-	-	-	0.20	2.66	16.54	63.73	91.99	99.25
中砂	-	-	-	4.8	32.8	51.2	70.0	85.6	95.3	-	-	-
粗骨料	7.14	23.6	77.3	99.5	-	-	-	-	-	-	-	-

沙漠砂替代率/%	单位体积材料用量/（kg·m^-3）						28 d抗压强度/MPa
	水	水泥	细骨料		粗骨料		立方体抗压强度	轴心抗压强度
	水	水泥	沙漠砂	中砂	粒径为5~10 mm	粒径为10~20 mm	立方体抗压强度	轴心抗压强度
0	185	370	0	538	377	880	34.6	26.0
40	185	370	215	323	377	880	42.2	31.3

荷载水平	温度和冷却方式
荷载水平	室温	300 ℃， N	300 ℃， W	500 ℃， N	500 ℃， W	700 ℃， N	700 ℃， W
0	0	4.50	2.17	5.63	2.34	7.83	3.23
0.4	0	4.12	1.76	5.41	2.12	7.62	3.14
0.6	0	4.05	2.01	5.26	2.16	7.56	3.44
0.8	0	4.66	2.09	5.90	1.72	7.66	2.93

Influence of loading and high temperature on uniaxial compressive properties of desert sand concrete

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