高温荷载耦合作用下地聚物砂浆损伤模型研究
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东华理工大学

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TU528

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国家自然科学金基项目(42061011,41977236);江西省自然科学基金(20192ACBL20002);新疆兵团科技计划项目(2020AB003)


Damage model of geopolymer mortar under high temperature load coupling
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East China University of Technology

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    摘要:

    为研究高温对地聚物砂浆的力学性能与导热性能的影响,以温度为变量设置了25℃、200℃、400℃、600℃、800℃这5种温度进行常规导热试验和单轴压力试验。试验获取了导热系数、应力-应变全曲线、抗压强度、峰值应变、切线模量等参数指标,并对不同高温作用后的地聚物砂浆进行了SEM和XRD试验,深入分析了不同温度对其力学性能与导热性能的影响规律,并建立了地聚物砂浆高温损伤模型。结果表明:(1)随着温度的升高,地聚物砂浆的导热系数呈现逐渐下降的趋势,温度为200℃时,相比于其他温度的导热系数下降幅度明显;(2)高温使地聚物砂浆的力学性能随温度的升高不断降低,并且随着温度升高,高温劣化作用越来越显著,使强度迅速下降;(3)高温会导致地聚物砂浆内部裂缝逐渐增多、C-S-H胶凝物质减少,在温度为600℃时C-S-H胶凝物质基本消失,800℃发生固相反应生成钙铝黄长石且砂浆内部细小裂缝转变为贯通型大裂缝;(4)建立了地聚物砂浆高温损伤模型。

    Abstract:

    In order to study the effect of high temperature on the mechanical properties and thermal conductivity of geopolymer mortar, five temperatures, 25°C, 200°C, 400°C, 600°C, and 800°C, were set up with temperature as a variable for conventional thermal conductivity tests and uniaxial pressure tests. . The thermal conductivity, stress-strain full curve, compressive strength, peak strain, tangent modulus and other parameters were obtained in the test. The influence law of its mechanical properties and thermal conductivity, and the high temperature damage model of geopolymer mortar is established. The results show that: (1) with the increase of temperature, the thermal conductivity of geopolymer mortar shows a decreasing trend. When the temperature is 200℃, the thermal conductivity of geopolymer mortar decreases significantly compared with other temperatures; (2) the high temperature makes the ground The mechanical properties of polymer mortar continue to decrease with the increase of temperature, and with the increase of temperature, the effect of high temperature deterioration becomes more and more significant, and the strength decreases rapidly; (3) high temperature will cause the internal cracks of geopolymer mortar to gradually increase, CSH The cementitious material decreases, and the CSH cementitious material basically disappears when the temperature is 600 °C, and the solid-phase reaction occurs at 800 °C to form mayenite, and the small cracks inside the mortar are transformed into large through-type cracks; (4) The high temperature of geopolymer mortar was established. damage model.

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陈昊. 高温荷载耦合作用下地聚物砂浆损伤模型研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2022-04-01
  • 最后修改日期:2022-09-15
  • 录用日期:2022-09-18
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