用于融冰化雪的炭黑轻集料导电混凝土的配制和性能  

Preparation and properties of lightweight aggregate concrete containing carbon black

作　　者：李滨[1] 孙明清[1] 陈龙[1] 

机构地区：[1]武汉理工大学理学院工程结构与力学系,湖北武汉430070

出　　处：《混凝土》2010年第2期121-123,129,共4页Concrete

基　　金：国家自然科学基金项目资助(50878170)

摘　　要：配制了新型的炭黑轻集料混凝土,对其电阻率、抗压强度、密度与炭黑掺量、龄期、灰砂比等的关系进行了研究。结果表明：炭黑轻集料混凝土的电阻率随炭黑掺量的变化呈现明显的滤渗特征,滤渗区对应的炭黑掺量在0.3%~1.39%这一区间,在这一区间电阻率下降最明显。炭黑掺量低于滤渗阈值时龄期对炭黑轻集料混凝土电阻率有较大的影响,当炭黑掺量高于渗流阈值时龄期对电阻率的影响较小。炭黑掺量增加,炭黑轻集料混凝土抗压强度降低,密度越小。提高灰砂比能使提高炭黑轻集料混凝土的抗压强度。当炭黑的体积掺量为1.94%,灰砂比为2.43~5.2时,炭黑轻集料混凝土抗压强度达到34~38 MPa,电阻率为82.6~100Ω.cm,密度为1 822~1 866 kg/m3。这种材料具有轻质、高强、高导电性的特点,可用于道路融冰化雪。A novel lightweight aggregate concrete filled with carbon black was prepared.Changes of its electrical resistivity,compressive strength and mass density with the content of carbon black,the curing period and cement/sand ratio were studied in this paper.Results show that percolation phenomena associated with electrical conductivity were observed.The percolation region was between 0.3%~1.39%.When the content of carbon black was more than the percolation threshold,the curing period made little influence on resistivity.On the contrary,when the content of carbon black was less than the percolation threshold,resistivity increased with the curing period increasing obviously.Compressive strength and mass density of the specimen decreased with carbon black increasing.With cement/sand ratio increasing,compressive strength improved.As the content of carbon black was 1.94%,cement/sand ratio was 2.43~5.2,compressive strength reached 34~38 MPa,resistivity was 82.6~100 Ω·cm, mass density was 1 822~1 866 kg/m3.These main properties indicated that this new type of conductive concrete exhibited lightweight,high-strength, good conductivity.Thus,it was suitable for deicing and melting snow in the traffic pavements.

关 键 词：炭黑 轻集料混凝土 滤渗 力学性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]