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定形相变材料的制备及对混凝土耐高温性能的影响
The Preparation of Stationary Phase Transition Materials and Its Effect on the High Temperature Resistance of Concrete
2021年第1期
定形相变材料;混凝土;耐高温性能;导热性能;力学强度
Stationary phase transition material; Concrete; High temperature resistance; Thermal performance; Mechanical strength
2021年第1期
10.19761/j.1000-4637.2021.01.017.04
河南省科技厅科技攻关项目(182102210409)。
王永伟1,唐百晓2,王伟涛3
1.黄河科技学院,河南 郑州 450000;2.安康学院,陕西 安康 725000;3.郑州市科瑞建设工程检测 有限公司,河南 郑州 450000

王永伟1,唐百晓2,王伟涛3

王永伟,唐百晓,王伟涛.定形相变材料的制备及对混凝土耐高温性能的影响[J].混凝土与水泥制品,2021(1),17-20.

WANG Y W,TANG B X,WANG W T.The Preparation of Stationary Phase Transition Materials and Its Effect on the High Temperature Resistance of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):17-20.

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摘   要:为了提高混凝土结构的耐高温性能,从混凝土自身的储热性能出发,制备了一种定形相变材料,并研究了该相变材料对混凝土导热性能和高温后力学强度的影响。结果显示:硫酸铝铵掺量越高,相变材料的相变焓越大,当其掺量超过70%时,差示扫描量热法(DSC)特征参数趋于稳定;定形相变材料具有较好的热稳定性,且高温下硫酸铝铵和SiO2并未发生化学反应;相变材料的加入能提高混凝土的储能密度,降低其导热系数,混凝土内部的温度随相变材料掺量的增多而逐渐降低;当相变材料掺量小于6.5%时,相变材料的加入能明显提高混凝土高温后的强度,而当相变材料掺量大于6.5%时,再提高其掺量对混凝土耐高温性能的改善作用有限。 Abstract: In order to improve the high temperature performance of concrete structure, a stationary phase transition material based on the heat storage properties of concrete was prepared, and the influence of phase transition material on thermal properties and mechanical strength after high temperature were studied. The results show that the higher the content of NH4Al(SO4)2·12H2O, the greater the phase transition enthalpy of the phase transition material. When the amount of admixture exceeds 70%, the DSC characteristic parameters tend to be stable. The stationary phase transition material has good thermal stability, and there is no chemical reaction between NH4Al(SO4)2·12H2O and SiO2 at high temperatures. The addition of phase transition materials can increase the energy storage density of concrete, and reduce its thermal conductivity. The temperature inside of the concrete gradually decreases with the increase of the amount of phase transition materials. When the amount of phase change material is less than 6.5%, the addition of phase change material can obviously increase the strength of the concrete after high temperature. When the amount of phase change material is greater than 6.5%, the effect of the amount of phase change material on the high temperature resistance of concrete is limited.
英文名 : The Preparation of Stationary Phase Transition Materials and Its Effect on the High Temperature Resistance of Concrete
刊期 : 2021年第1期
关键词 : 定形相变材料;混凝土;耐高温性能;导热性能;力学强度
Key words : Stationary phase transition material; Concrete; High temperature resistance; Thermal performance; Mechanical strength
刊期 : 2021年第1期
DOI : 10.19761/j.1000-4637.2021.01.017.04
文章编号 :
基金项目 : 河南省科技厅科技攻关项目(182102210409)。
作者 : 王永伟1,唐百晓2,王伟涛3
单位 : 1.黄河科技学院,河南 郑州 450000;2.安康学院,陕西 安康 725000;3.郑州市科瑞建设工程检测 有限公司,河南 郑州 450000

王永伟1,唐百晓2,王伟涛3

王永伟,唐百晓,王伟涛.定形相变材料的制备及对混凝土耐高温性能的影响[J].混凝土与水泥制品,2021(1),17-20.

WANG Y W,TANG B X,WANG W T.The Preparation of Stationary Phase Transition Materials and Its Effect on the High Temperature Resistance of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):17-20.

摘要
参数
结论
参考文献
引用本文

摘   要:为了提高混凝土结构的耐高温性能,从混凝土自身的储热性能出发,制备了一种定形相变材料,并研究了该相变材料对混凝土导热性能和高温后力学强度的影响。结果显示:硫酸铝铵掺量越高,相变材料的相变焓越大,当其掺量超过70%时,差示扫描量热法(DSC)特征参数趋于稳定;定形相变材料具有较好的热稳定性,且高温下硫酸铝铵和SiO2并未发生化学反应;相变材料的加入能提高混凝土的储能密度,降低其导热系数,混凝土内部的温度随相变材料掺量的增多而逐渐降低;当相变材料掺量小于6.5%时,相变材料的加入能明显提高混凝土高温后的强度,而当相变材料掺量大于6.5%时,再提高其掺量对混凝土耐高温性能的改善作用有限。

Abstract: In order to improve the high temperature performance of concrete structure, a stationary phase transition material based on the heat storage properties of concrete was prepared, and the influence of phase transition material on thermal properties and mechanical strength after high temperature were studied. The results show that the higher the content of NH4Al(SO4)2·12H2O, the greater the phase transition enthalpy of the phase transition material. When the amount of admixture exceeds 70%, the DSC characteristic parameters tend to be stable. The stationary phase transition material has good thermal stability, and there is no chemical reaction between NH4Al(SO4)2·12H2O and SiO2 at high temperatures. The addition of phase transition materials can increase the energy storage density of concrete, and reduce its thermal conductivity. The temperature inside of the concrete gradually decreases with the increase of the amount of phase transition materials. When the amount of phase change material is less than 6.5%, the addition of phase change material can obviously increase the strength of the concrete after high temperature. When the amount of phase change material is greater than 6.5%, the effect of the amount of phase change material on the high temperature resistance of concrete is limited.

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(1)随着相变材料中NH4Al(SO4)2·12H2O掺量的增多,相变温度逐渐升高,相变焓大幅增加,当NH4Al(SO4)2·12H2O掺量超过70%时,再增加其掺量, DSC特征参数的变化幅度变小。
(2)70%NH4Al(SO4)2·12H2O的热稳定性高于纯NH4Al(SO4)2·12H2O,高温条件下,相变材料中的SiO2只对NH4Al(SO4)2·12H2O起到热分解作用,并未与其发生化学反应。
(3)随着相变材料掺量的增多,混凝土的储能密度和比热容逐渐增大,导热系数逐渐减小;当温度超过320 ℃时,相变材料掺量为4.5%和6.5%混凝土的抗压强度大于普通混凝土,且内部温度低于普通混凝土,表明相变材料的掺入能明显提高混凝土的耐高温性能,但当相变材料掺量超过6.5%时,对耐高温性能的改善效果不明显。

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王永伟,唐百晓,王伟涛.定形相变材料的制备及对混凝土耐高温性能的影响[J].混凝土与水泥制品,2021(1),17-20.

WANG Y W,TANG B X,WANG W T.The Preparation of Stationary Phase Transition Materials and Its Effect on the High Temperature Resistance of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):17-20.

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