苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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铸造废砂对轻骨料自密实混凝土耐高温性能的影响及建模分析
Effects of foundry waste sand on high temperature resistance of lightweight aggregate self-compacting concrete and its modeling analysis
2024年第6期
铸造废砂;轻骨料混凝土;自密实混凝土;高温;抗压强度;导热系数;温度场
Foundry waste sand; Lightweight aggregate concrete; Self-compacting concrete; High temperature; Compressive strength; Thermal conductivity; Temperature field
2024年第6期
10.19761/j.1000-4637.2024.06.094.07
国家自然科学基金项目(52378247);山东省高等学校青年创新团队计划项目(2021KJ019);国家级大学生创新创业训练项目(202210429067)。
王春莉1,刘梦宇2,郑 蕊2,鲍玖文2,*
1.泰山科技学院 建筑工程学院,山东 泰安 271000;2.青岛理工大学 土木工程学院,山东 青岛 266520

王春莉1,刘梦宇2,郑 蕊2,鲍玖文2,*

王春莉,刘梦宇,郑蕊,等.铸造废砂对轻骨料自密实混凝土耐高温性能的影响及建模分析[J].混凝土与水泥制品,2024(6):94-99,105.

WANG C L,LIU M Y,ZHENG R,et al.Effects of foundry waste sand on high temperature resistance of lightweight aggregate self-compacting concrete and its modeling analysis[J].China Concrete and Cement Products,2024(6):94-99,105.

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摘   要:采用铸造废砂(WFS)等质量替代0、25%、50%、75%、100%的河砂制备了轻骨料自密实混凝土(LWASCC),研究了LWASCC在不同温度(20、100、200、300、400 ℃)下的力学性能和导热系数变化规律,并采用有限元软件建立了高温环境中LWASCC的传热模型。结果表明:随着WFS掺量的增加,试件在不同温度下的抗压强度基本均先增大后减小;经历100~300 ℃高温后,试件的抗压强度较20 ℃时有所提高,而经历400 ℃高温后,试件的抗压强度较20 ℃时基本有所降低;试件的导热系数随着WFS掺量的增加呈先减小后增大的趋势;建立的传热模型能有效模拟LWASCC在高温下的传热过程;综合考虑试验及模拟结果,当WFS掺量为50%时,LWASCC的耐高温性能最好。 Abstract: Lightweight aggregate self-compacting concrete (LWASCC) was prepared by replacing 0, 25%, 50%, 75%, and 100% of river sand with foundry waste sand (WFS). The mechanical properties and thermal conductivity of LWASCC were studied at different temperatures(20, 100, 200, 300, 400 ℃), and a heat transfer model of LWASCC in  high temperature environment was established by using finite element software. The results show that with the increase of WFS content, the compressive strength of the specimens at different temperatures basically increases first and then decreases. After experiencing a high temperature of 100~300 ℃, the compressive strength of the specimens is increased compared to the compressive strength at 20 ℃, while after experiencing high temperature of 400 ℃, the compressive strength of the specimens is basically decreased compared to the compressive strength at 20 ℃. The thermal conductivity of the specimen shows a trend of first decreasing and then increasing with the increase of WFS content. The established heat transfer model can effectively simulate the heat transfer process of LWASCC at high temperatures. Taking into account the experimental and simulation results, LWASCC exhibits the best high temperature resistance when the WFS content is 50%.
英文名 : Effects of foundry waste sand on high temperature resistance of lightweight aggregate self-compacting concrete and its modeling analysis
刊期 : 2024年第6期
关键词 : 铸造废砂;轻骨料混凝土;自密实混凝土;高温;抗压强度;导热系数;温度场
Key words : Foundry waste sand; Lightweight aggregate concrete; Self-compacting concrete; High temperature; Compressive strength; Thermal conductivity; Temperature field
刊期 : 2024年第6期
DOI : 10.19761/j.1000-4637.2024.06.094.07
文章编号 :
基金项目 : 国家自然科学基金项目(52378247);山东省高等学校青年创新团队计划项目(2021KJ019);国家级大学生创新创业训练项目(202210429067)。
作者 : 王春莉1,刘梦宇2,郑 蕊2,鲍玖文2,*
单位 : 1.泰山科技学院 建筑工程学院,山东 泰安 271000;2.青岛理工大学 土木工程学院,山东 青岛 266520

王春莉1,刘梦宇2,郑 蕊2,鲍玖文2,*

王春莉,刘梦宇,郑蕊,等.铸造废砂对轻骨料自密实混凝土耐高温性能的影响及建模分析[J].混凝土与水泥制品,2024(6):94-99,105.

WANG C L,LIU M Y,ZHENG R,et al.Effects of foundry waste sand on high temperature resistance of lightweight aggregate self-compacting concrete and its modeling analysis[J].China Concrete and Cement Products,2024(6):94-99,105.

摘要
参数
结论
参考文献
引用本文

摘   要:采用铸造废砂(WFS)等质量替代0、25%、50%、75%、100%的河砂制备了轻骨料自密实混凝土(LWASCC),研究了LWASCC在不同温度(20、100、200、300、400 ℃)下的力学性能和导热系数变化规律,并采用有限元软件建立了高温环境中LWASCC的传热模型。结果表明:随着WFS掺量的增加,试件在不同温度下的抗压强度基本均先增大后减小;经历100~300 ℃高温后,试件的抗压强度较20 ℃时有所提高,而经历400 ℃高温后,试件的抗压强度较20 ℃时基本有所降低;试件的导热系数随着WFS掺量的增加呈先减小后增大的趋势;建立的传热模型能有效模拟LWASCC在高温下的传热过程;综合考虑试验及模拟结果,当WFS掺量为50%时,LWASCC的耐高温性能最好。

Abstract: Lightweight aggregate self-compacting concrete (LWASCC) was prepared by replacing 0, 25%, 50%, 75%, and 100% of river sand with foundry waste sand (WFS). The mechanical properties and thermal conductivity of LWASCC were studied at different temperatures(20, 100, 200, 300, 400 ℃), and a heat transfer model of LWASCC in  high temperature environment was established by using finite element software. The results show that with the increase of WFS content, the compressive strength of the specimens at different temperatures basically increases first and then decreases. After experiencing a high temperature of 100~300 ℃, the compressive strength of the specimens is increased compared to the compressive strength at 20 ℃, while after experiencing high temperature of 400 ℃, the compressive strength of the specimens is basically decreased compared to the compressive strength at 20 ℃. The thermal conductivity of the specimen shows a trend of first decreasing and then increasing with the increase of WFS content. The established heat transfer model can effectively simulate the heat transfer process of LWASCC at high temperatures. Taking into account the experimental and simulation results, LWASCC exhibits the best high temperature resistance when the WFS content is 50%.

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(1)常温下,试件的抗压强度随着WFS掺量的增加呈先增大后减小的趋势,且当WFS掺量为50%时达到最大。经历100~300 ℃高温后,试件的抗压强度变化率均≥0,说明抗压强度较常温时有所提高;当温度达到400 ℃后,除WFS掺量为75%的试件外,其余试件的抗压强度变化率均降至0以下。
(2)随着WFS掺量的增加,试件的导热系数和干密度均先减小后增大,且当WFS掺量为50%时达到最小。
(3)基于传热学基本原理建立的LWASCC传热模型的模拟结果表明,试件在受热过程中,热量沿着试件厚度方向由外向内梯度传递。
(4)宏观及模拟试验结果均表明,当WFS的掺量为50%时,试件的耐高温性能最好。

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王春莉,刘梦宇,郑蕊,.铸造废砂对轻骨料自密实混凝土耐高温性能的影响及建模分析[J].混凝土与水泥制品,2024(6):94-99,105.

WANG C L,LIU M Y,ZHENG R,et al.Effects of foundry waste sand on high temperature resistance of lightweight aggregate self-compacting concrete and its modeling analysis[J].China Concrete and Cement Products,2024(6):94-99,105.

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