摘要
建筑渣土堆集占用了大量的土地资源,并造成一定程度的环境污染。采用新型固化剂NB01对宁波典型建筑渣土进行固化处理,通过开展无侧限抗压强度试验、路用性能试验、X射线衍射试验和电镜扫描试验,探究NB01固化建筑渣土路基填料的固化效果,揭示NB01固化建筑渣土的作用机理。结果表明:固化渣土无侧限抗压强度(qu)随着养护龄期和掺量的增加而增长,采用10%掺量NB01型固化剂加固宁波建筑渣土,养护28 d后qu可达到1396 kPa,固化土的水稳系数达0.96,CBR值达到25.80%以上,满足路基填料性能要求。NB01型固化剂水化反应生成C-A-H和C-S-H凝胶增强了土颗粒之间的胶结性,并且填充了孔隙,提高了固化建筑渣土的力学性能。研究成果可为建筑渣土的资源再生利用提供参考。
The accumulation of construction waste soil has occupied a large amount of land resources and result in environmental pollution.A new curing agent,NB01,was adopted to solidify typical construction waste soil in Ningbo.Through conducting a series of macro-micro laboratory tests such as unconfined compressive strength test,road performance test,X-ray diffraction test,and electron microscopy scanning test,the solidification effect of NB01 solidified construction waste soil roadbed filler was investigated,and the mechanism of NB01 solidified construction waste soil was further revealed.The test results show that the unconfined compression strength,qu,of solidified muck increases with the increase of curing age and content.After 28-day curing,qu of the solidified muck can reach 1396 kPa,the water stability coefficient of the solidified soil approaches to 0.96,and the CBR value is larger than 25.80%,which meets the performance requirements of subgrade filler.The hydration reaction of NB01 can produce C-A-H and C-S-H gel,which enhance the cementation between soil particles and fill the pores and further promote the mechanical properties of solidified construction waste soil.The study could provide guidance for the recycling and utilization of construction waste resources.
作者
许大鹏
朱剑锋
汪正清
Xu Dapeng;Zhu Jianfeng;Wang Zhengqing(Mingyang(Ningbo)Environmental Protection Technology Co.,Ltd.,Ningbo 315021,Zhejiang,China;School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China;Hangzhou Luda Highway Engineering General Company,Hangzhou 310024,Zhejiang,China)
出处
《岩土工程技术》
2024年第5期605-610,共6页
Geotechnical Engineering Technique
基金
浙江省公益项目(LGG22E090002)
浙江省水利防灾减灾重点实验室开放基金(FZJZSYS21007)。
关键词
建筑渣土
无侧限抗压强度
水稳定性
加州承载比
微观机理
construction waste soil
unconfined compressive strength
water stability
CBR
microscopic mechanism
