长江科学院院报 ›› 2018, Vol. 35 ›› Issue (2): 119-124.DOI: 10.11988/ckyyb.20161102

• 水工结构与材料 • 上一篇    下一篇

巷道隔热喷射混凝土强度及导热性能试验研究

庞建勇,黄金坤,姚文杰,刘 欢,姚韦靖   

  1. 安徽理工大学 土木建筑学院,安徽 淮南 232001
  • 收稿日期:2016-10-25 出版日期:2018-02-01 发布日期:2018-03-01
  • 作者简介:庞建勇(1964-),男,河北保定人,教授,博士,博士生导师,主要从事矿山岩体力学与支护方面的教学与研究工作。E-mail:jkunhuang@163.com
  • 基金资助:
    国家安全监管总局安全生产重大事故防治关键技术科技项目(Anhui-0003-2016AQ);安徽省高校自然科学研究重大项目(KJ2015ZD20);2015年度矿山地下工程教育部工程研究中心开放基金课题(2015KF05)

Experimental Study on Thermal Conductivity andStrength of Thermal Shotcrete in Roadway

PANG Jian-yong, HUANG Jin-kun, YAO Wen-jie, LIU Huan, YAO Wei-jin   

  1. School of Civil Engineering and Architecture, Anhui University of Science and Technology,Huainan 232001, China
  • Received:2016-10-25 Published:2018-02-01 Online:2018-03-01

摘要: 随着煤矿开采深度不断增加,巷道的高温热害问题尤为突出。在普通喷射混凝土中掺入陶粒、憎水玻化微珠、粉煤灰以及改变砂子的用量来设计正交试验,研究混凝土的抗压强度、抗拉强度、抗折强度和导热系数的变化。试验结果表明:憎水玻化微珠是影响混凝土的导热系数、抗压、抗拉和抗折强度的主要因素,因此憎水玻化微珠掺量宜选在100%;陶粒是影响混凝土抗折强度的主要因素,贡献率高达60.61%,因此陶粒的掺量在20%最优;随着粉煤灰掺量的增大,导热系数先降低后增大,强度先提高后降低,因此粉煤灰掺量宜为20%;随着砂子用量的降低,导热系数一直在降低,抗压强度和抗拉强度先提高后降低,抗折强度一直在提高,因此砂子用量在571 kg/m3最优。

关键词: 喷射混凝土, 保温隔热, 正交试验, 陶粒, 玻化微珠, 粉煤灰, 导热系数, 强度性能

Abstract: High temperature damage on roadway had been particularly outstanding with the increment of mining depth. By mixing ceramsite, hydrophobic vitrified beads, fly ash and changing the dosage of sand in ordinary shotcrete, we designed orthogonal experiment to researching the variations of compressive strength, tensile strength, flexural strength and heat conductivity coefficient. Experimental results show that hydrophobic vitrified bead is a dominant factor that affects the strengths and heat conductivity coefficient of concrete, hence we recommend the optimum dosage of hydrophobic vitrified beads as 100%. Ceramsite is also a major factor affecting the flexural strength, with a contribution rate up to 60.61% and therefore we conclude the optimum ceramsite dosage to be 20%. With the increasing of fly ash content, heat conductivity coefficient firstly reduced and subsequently increased; while the strength of shotcrete is on the contrary. Finally, with the decline of sand dosage, heat conductivity coefficient had been reducing all the time whereas flexural strength had been increasing, and compressive and tensile strength firstly increased and then reduced; therefore the optimum sand dosage is 580 kg/m3.

Key words: shotcrete, heat preservation and heat insulation, orthogonal test, ceramsite, vitrified beads, fly ash, heat conductivity coefficient, strength

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