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

摘要/Abstract

摘要：

为了研究高温后的沙漠砂混凝土力学性能，采用毛乌素沙地砂代替部分中砂制备沙漠砂混凝土，对经历不同荷载和温度作用后的沙漠砂混凝土进行轴心抗压强度试验，测得应力-应变曲线，分析了荷载水平、温度等级和冷却方式对沙漠砂混凝土高温后的质量损失率、超声波速和单轴受压性能的影响。结果表明：随着温度的升高，沙漠砂混凝土质量损失率逐渐增大，轴心抗压强度逐渐减小，峰值应变显著增大，弹性模量不断降低，应力-应变曲线趋于扁平。最后，基于混凝土两阶段本构模型，建立了考虑温度和荷载水平影响的沙漠砂混凝土本构模型。

关键词: 沙漠砂混凝土, 荷载水平, 单轴压缩, 高温, 应力-应变关系

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

中图分类号:

TU528

刘海峰,陶仁光,车佳玲,杨维武,朱立晨. 荷载和高温对沙漠砂混凝土单轴抗压性能的影响[J]. 吉林大学学报(工学版), 2024, 54(9): 2609-2619.

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.

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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