导电炭黑Super-P对混凝土性能的影响  

Effect of conductive carbon black Super-P on concrete properties

作　　者：何威[1,2,3] 李世磊[1,2,3] 王亚伟 焦志男 李桂峰 HE Wei;LI Shilei;WANG Yawei;JIAO Zhinan;LI Guifeng(Hebei Provincial Key Laboratory of Green Construction and Intelligent Operation in Civil Engineering,Yanshan University,Qinhuangdao 066004,China;Hebei Building Low-carbon Clean Heating Technology Innovation Center,Yanshan University,Qinhuangdao 066004,China;School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学,河北省土木工程绿色建造与智能运维重点实验室,秦皇岛066004 [2]燕山大学,河北省建筑低碳清洁供热技术创新中心,秦皇岛066004 [3]燕山大学建筑工程与力学学院,秦皇岛066004

出　　处：《复合材料学报》2023年第1期383-395,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51578477)。

摘　　要：采用低成本和高稳定性的纳米导电炭黑Super-P(CBSP)作为水泥混凝土的添加剂。通过设置不同的水灰比和不同的CBSP掺量,研究了CBSP的加入对混凝土各方面性能的影响(即坍落度、力学性能、抗渗性能、导电性能和温敏性能)。通过SEM对混凝土微观形貌进行分析。实验结果显示,掺入纳米材料CBSP使混凝土坍落度不断降低。随着CBSP的掺入量不断增大,混凝土的力学性能先提升后降低且各龄期变化趋势相似,当CBSP的掺入量为0.75wt%时力学性能达到最大。同时混凝土的力学性能随水灰比的增加而降低。混凝土的抗渗性能随着CBSP掺量的增加而先提高后降低,且当水灰比较大时抗渗性能有所降低。当CBSP掺入量为0.75wt%~2wt%时,混凝土电阻率迅速降低。标准养护条件比室内干燥养护的混凝土电阻率低。不同水灰比混凝土之间电阻率相差较小。SEM显示了CBSP的填充孔隙和隧道导电作用。通过实验证明CBSP的加入可以改善混凝土的各项性能。Nano conductive carbon black Super-P(CBSP)with low cost and high stability was used as additive of cement concrete.By setting different water-cement ratios and different CBSP contents,the effects of CBSP addition on various properties of concrete(slump,mechanical properties,impermeability,electrical conductivity and temperature sensitivity)were studied.The microstructure of concrete was analyzed by SEM.The experimental results show that the slump of concrete decreases with the addition of CBSP.With the increase of CBSP content,the mechanical properties of concrete improve first and then decrease,and the change trend of each age is similar.When the CBSP content is 0.75wt%,the mechanical properties reach the maximum.Meanwhile,the mechanical properties of concrete decrease with the increase of water cement ratio.The impermeability of concrete increases first and then decreases with the increase of CBSP content and decreases when the water-cement ratio is large.When CBSP content is 0.75wt%-2wt%,the resistivity of concrete decreases rapidly.The resistivity of concrete cured by standard curing condition is lower than that cured by indoor drying.The resistivity of concrete with different water cement ratios has little difference.SEM shows that CBSP fills pores and conducts electricity in tunnels.Experiments show that the addition of CBSP can improve the performance of concrete.

关 键 词：导电炭黑Super-P(CBSP) 混凝土 力学性能 抗渗性能 导电性能 温敏性能 

分 类 号：TB332[一般工业技术—材料科学与工程]