石墨原矿导电混凝土的制备与性能研究

Study on preparation and properties of graphite ore conductive concrete

选取石墨、石墨原矿以及石墨尾矿为导电相材料制备导电混凝土,首先对石墨原矿混凝土基于正交试验进行配合比设计。试验结果表明,影响石墨原矿混凝土抗压、抗折强度以及电阻率的各因素主次顺序均为:石墨原矿掺量>水灰比>砂率>减水剂掺量,并得出最优配合比为水灰比0.52,砂率0.38,减水剂掺量1.4%。然后,对不同配合比的石墨、石墨原矿以及石墨尾矿混凝土进行抗压、抗折和电阻率试验。结果表明,3种混凝土抗压、抗折以及电阻率分别随着石墨类材料掺量的增加而降低,三者混凝土的电阻率均满足导电混凝土工程要求,当石墨原矿掺量为15%时,混凝土电阻率为10 950Ω·m可作防静电混凝土应用于工业防静电,电力设备接地等工程当中。

Graphite,graphite raw ore and graphite tailings were selected as conductive phase materials to prepare conductive concrete.Firstly,the mix ratio of graphite raw ore concrete was designed based on orthogonal test.The test results showed that the primary and secondary factors affecting the compressive strength,flexural strength and resistivity of graphite ore concrete were as follows:graphite ore content>water cement ratio>sand ratio>water reducing agent content.The optimal mix ratio was obtained,which was water cement ratio of 0.52,sand ratio of 0.38 and water reducing agent content of 1.4%.Then,the compressive,flexural and resistivity tests of graphite,graphite ore and graphite tailings concrete with different mix ratios were carried out.The results showed that the compressive,flexural and resistivity of the three kinds of concrete decreased with the increase of the content of graphite materials.The resistivity of the three kinds of concrete meets the requirements of conductive concrete engineering.When the content of graphite ore is 15%,the resistivity of concrete is 10950Ω·m,which can be used as anti-static concrete in industrial anti-static,power equipment grounding and other projects.