摘要
通过采用无侧限抗压强度试验、电镜扫描等试验方法,研究了有机酸总量、胡富比、胡敏酸(HA)、富里酸(FA)及矿渣掺量对矿渣基地聚合物固化有机质土(GGBS-G)强度的影响规律。结果表明:矿渣基地聚合物固化有机质土强度随着有机酸总量的增加显著降低,而随着胡富比的增大而上升。随着胡敏酸含量的增加,固化有机质土的强度先减小后增加,且胡敏酸含量为5%左右时对固化土强度影响最大;随着富里酸含量的增加,其固化土强度持续减小,且当富里酸含量超过0.5%时,固化有机质土强度损失率达到50%以上;同时,对于以胡敏酸为主要成分的有机质土,增大矿渣掺量会提高固化有机质土的强度,但提升效果会随着富里酸含量的增加而减弱。通过电镜扫描发现,富里酸附着在矿渣颗粒表面,阻碍地聚合物的生成,削弱土颗粒间的连接,对其强度形成劣化影响。
The unconfined compression strength test and X-ray diffraction were used to investigate the effects of total organic acid,ratio of HA to FA,humic acid(HA),fulvic acid(FA),GGBS on the solidification effect of ground granulated blast furnace-slag based geopolymer(GGBS-G).The results show that the strength of GGBS-G-solidified organic soil decreased significantly with the increase of total organic acid,but increased with the increase of the ratio of HA to FA.When the content of humic acid increases,the strength of solidified organic soil first decreases and then increases,and when the content of humic acid is about 5%,it has the greatest influence on the strength of solidified soil;when the fulvic acid content exceeds 0.5%,the strength loss rate of GGBS-G-solidified organic soil reaches above 50%.For organic soil with humic acid as the main component of organic acid,increasing the content of slag can improve the strength of solidified organic soil,but the improving effect will be weakened with the increase of fulvic acid content.Scanning electron microscopy showed that fulvic acid adhered to the surface of slag particles,hindered the formation of geopolymer,weakened the connection between soil particles,and degraded the strength of slag particles.
作者
郭雁翔
陈庚
陈荣伟
祁冠豫
冯钿杰
GUO Yanxiang;CHEN Geng;CHEN Rongwei;QI Guanyu;FENG Dianjie(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Nantong Hohai University Department of Civil and Airport Engineering,Nantong 226300,China;Geotechnical Research Intituite,Hohai Uninverity,Nanjing 210098,China;Zhejiang Highway and Waterway Engineering Consulting Co,Ltd,Hangzhou 310012,China;Shanghai Municipal Engineering Design Institute(Group)Co,Ltd,Shanghai 200092,China)
出处
《粉煤灰综合利用》
CAS
2022年第2期28-33,63,共7页
Fly Ash Comprehensive Utilization
基金
国家自然科学基金(52178327)
南通市科技计划项目(MS12021029)
浙江省交通运输厅工程建设科研项目(2022-GCKY-10)。
