摘要
为降低深部矿山高温热灾害影响,研发了适用于矿山领域的石蜡加气混凝土复合相变材料(AAC-PCM),将其按照不同质量掺入尾砂充填体中制成加气混凝土相变充填体。为探究相变充填体的强度特征和热学性能,对掺入不同含量AAC-PCM的充填体进行了力学试验、导热系数试验、SEM、DSC等测试。研究结果表明:添加AAC-PCM增大了充填体的孔隙率,导致充填体强度随AAC-PCM的添加而逐渐降低,但强度降低幅度逐渐减弱;AAC-PCM的相变起始温度为24.75℃,峰值温度为33.38℃,相变焓值为40.71 J/g;添加复合相变材料充填体的导热系数最大降幅达30%,比热容升高约31.4%;添加少量的AAC-PCM可以显著提高充填体的储热能力,且具有良好的强度,满足矿山实际使用。
In order to reduce the impact of high temperature thermal hazards in deep mines,paraffin-autoclaved aerated concrete composite phase change material(AAC-PCM),was developed for mining applications and mixed into the tailing sand backfill in different masses to make autoclaved aerated concrete phase change thermal storage backfill.Investigate the strength characteristics and thermal properties of the thermal storage backfill,mechanical tests,thermal conductivity tests,SEM and DSC tests were carried out on the backfill mixed with different resulting in a gradual decrease in the strength of the composite thermal storage backfill with the addition of AACPCM,but the decrease in strength gradually decreases.The maximum reduction in thermal conductivity was 30%and the specific heat capacity increased by about 31.4%.Doping a small amount of AAC-PCM can significantly improve the thermal storage capacity of the backfill and has good strength for practical use in mines.
作者
王晓军
蒋旭
王石
赵奎
张泽群
Wang Xiaojun;Jiang Xu;Wang Shi;Zhao Kui;Zhang Zequn(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiang Xi,341000,China;Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiang Xi,341000,China)
出处
《地下空间与工程学报》
CSCD
北大核心
2023年第2期391-399,共9页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51804134)
江西省自然科学基金(20192BAB206018)
江西省研究生创新专项资金项目(YC2021-S552)
江西省“双千计划”科技创新高端人才项目(jxsq2019201043)
江西省青年井岗学者奖励计划(QNJG2018051)。
关键词
充填体
抗压强度
相变材料
导热系数
backfill
compressive strength
phase change material
thermal conductivity
