不同冷却方式下ALC高温劣化损伤试验研究
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TU528

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安徽省高校协同创新项目(GXXT-2019-005),安徽理工大学研究生创新基金(2021CX2031)


Experimental study on high temperature deterioration damage of ALC under different cooling methods
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Collaborative Innovation Project of Universities in Anhui Province (GXXT-2019-005),Anhui University of Science and Technology Graduate Innovation Fund (2021CX2031)

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    摘要:

    为研究不同冷却方式下ALC在高温处理后性能劣化损伤情况,通过对不同温度、不同冷却方式处理后的ALC试件进行超声无损检测试验、静态力学性能试验、毛细吸水试验的方法研究了温度、冷却方式对其质量损失率、纵波波速、抗压强度、弹性模量、应力应变关系、能量耗散、毛细吸水性的影响。研究结果表明:ALC内各种水化产物受热分解,水分消散,体积膨胀,微裂隙增加,纵波波速减小,抗压强度减小,弹性模量降低,塑性提高,峰值应变增加,能量耗散不断提高,最大毛细吸水量增大;其应力-应变曲线的形状与普通混凝土相似,都经历了压密阶段、弹塑性阶段、破坏阶段、残余阶段。喷淋冷却试件相对于自然冷却试件在300℃前损伤较小,性能劣化程度较低,300~600℃时劣化损伤明显增大,毛细吸水性增长显著,600~800℃时不同冷却方式对ALC性能影响逐渐减小。可见,不同的冷却方式对高温处理后ALC有一定的影响,但随着温度升高,影响逐渐降低。

    Abstract:

    In order to study the performance deterioration and damage of ALC after high temperature treatment under different cooling methods,ultrasonic nondestructive test, static mechanical properties test and capillary water absorption test was used to investigate the effects of temperature and cooling methods on mass loss rate, longitudinal wave velocity, compressive strength, elastic modulus, stress-strain relationship, energy loss and capillary water absorption of ALC specimens treated by different temperatures and cooling methods .The results show that all kinds of hydration products in ALC are decomposed by heating, water dissipating, volume expanding, microcracks increasing, longitudinal wave velocity decreasing, compressive strength decreasing, elastic modulus decreasing, plasticity increasing, peak strain increasing, energy dissipation increasing and maximum capillary water absorption increasing. The shape of stress-strain curve is similar to that of ordinary concrete, which has gone through compaction stage, elastoplastic stage, failure stage and residual stage. Compared with the natural cooling specimen, the spray cooling specimen has less damage before 300℃, and the performance degradation degree is lower. The degradation damage increases obviously at 300~600℃, and the capillary water absorption increases significantly. The influence of different cooling methods on ALC performance decreases gradually at 600~800℃. It is concluded that different cooling methods have certain influence on ALC after high temperature treatment, but with the increase of temperature, the influence gradually weakens.

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李龙钰,马芹永,袁璞,等. 不同冷却方式下ALC高温劣化损伤试验研究[J]. 科学技术与工程, 2022, 22(8): 3254-3260.
Li Longyu, Ma Qinyong, Yuan Pu, et al. Experimental study on high temperature deterioration damage of ALC under different cooling methods[J]. Science Technology and Engineering,2022,22(8):3254-3260.

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  • 收稿日期:2021-06-21
  • 最后修改日期:2021-12-17
  • 录用日期:2021-11-16
  • 在线发布日期: 2022-03-21
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