钢渣-偏高岭土基导电地聚合物的压敏性能研究  

Piezoresistive Property of Steel Slag-Metakaolin Based Conductive Geopolymer

作　　者：马彬 黄启钦 肖薇薇 黄小林 MA Bin;HUANG Qiqin;XIAO Weiwei;HUANG Xiaolin(School of Architecture and Transportation Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林电子科技大学建筑与交通工程学院,广西桂林541004

出　　处：《材料导报》2024年第6期147-152,共6页Materials Reports

基　　金：国家自然科学基金(12162010);广西科技基地和人才专项(AD19245143);广西自然科学基金(2021GXNSFAA220087)。

摘　　要：以钢渣和偏高岭土为主要原材料制备导电地聚合物,分析了钢渣掺量和养护温度对其抗压强度、电阻率、压敏性能以及微观结构的影响规律,并对其压敏性能进行了评估。结果表明:随着养护龄期的延长和养护温度的升高,试样抗压强度均有一定的增加,其中钢渣掺量为30%时试样抗压强度最高。在不同养护温度下,钢渣掺量越多,试样电阻率越低。养护温度的升高提升了试样早期物理力学性能,然而随着龄期延长,温度对试样电阻率的影响变弱。此外,在循环压缩荷载作用下,试样的最优应变灵敏度为40.35~50.31,远高于电阻应变片的灵敏度2。其中,当养护温度为40℃、钢渣掺量为30%时,试样电阻变化率(FCR)与循环压缩应力的相关系数R~2高达0.953,试样压敏稳定性最优。由微观分析可知,当养护温度为60℃时,试样微观结构最为致密,稳定性最好,致使其应变灵敏度较低。在相同养护温度下,随着钢渣掺量的增加,试样致密性先增强后减弱,其中SS-30组最优,该结果与强度结果吻合较好。可见,钢渣-偏高岭土基导电地聚合物将是一种理想的压敏基体材料。Conductive geopolymer was prepared with steel slag and metakaolin as main raw material.Meanwhile the influence of steel slag mixing amount and curing temperature on compressive strength,electrical resistivity,piezoresistive property and microstructure were analyzed,and then piezoresistive property was evaluated.The results show that with the increase of curing period and curing temperature,compressive strength of specimen is all increased somewhat,among which the compressive strength is the highest when steel slag mixing amount is 30%.Another,at different curing temperatures,the more the steel slag is mixed,the lower the electrical resistivity of specimen.Increase of curing temperature improves early physical and mechanical properties of specimen.However,with the growth of curing period,influence of temperature on the electrical resistivity of specimen becomes weaker.In addition,under the stress of cyclic compression load,the optimal strain sensitivity of specimen is 40.35—50.31,which is much higher than that of the resistance strain sheet(strain sensitivity is 2).Among them,when curing temperature is 40℃and steel slag mixing amount is 30%,the correlation coefficient R 2 between FCR and cyclic compression stress is as high as 0.953,and the piezoresistive stability is optimal.At last,microscopic analysis shows that when curing temperature is 60℃,microstructure is the most compact and has the best stability,resulting in a low strain sensitivity.At the same curing temperature,with increase of steel slag mixing amount,the density of specimen is first enhanced and then weakened,and the SS-30 group is optimal,which is in good agreement with the strength results.Obviously,the steel slag-metakaolin based conductive geopolymer will be an ideal piezoresistive matrix material.

关 键 词：导电地聚合物 压敏性能 抗压强度 钢渣掺量 养护温度 

分 类 号：TU528.41[建筑科学—建筑技术科学]