摘要
为了深入了解干湿交替作用下沿海地区硫酸盐侵蚀地聚物混凝土的力学性质,通过室内试验研究了标准养护后地聚物混凝土的质量损失、应力-应变关系、抗压强度与弹性模量等力学性能。结果表明,随着干湿交替次数的增加,地质聚合物混凝土试件质量在20次干湿交替时出现轻微增大,而后逐渐减小。地聚物混凝土的应力-应变曲线可分为3个阶段:线性增长阶段、减速增长阶段与缓慢下降阶段,分别对应于试件的弹性变形阶段、弹塑性变形阶段以及破碎阶段。不同干湿交替次数条件下,试件的应力-应变关系曲线整体趋势比较相似,而随着干湿交替次数的增加,试件的峰值应力与残余应力都逐渐降低。随着干湿交替次数的增大,地聚物混凝土的抗压强度与弹性模量逐渐降低,反应出硫酸盐侵蚀会导致地聚物混凝土的强度损失,引发其内部产生损伤,从而对其产生对其不利的影响。
In order to deeply study the mechanical properties of sulfate eroded geopolymer concrete in coastal areas under the action of dry-wet cycle,the mass loss,stress-strain relationship,compressive strength and elastic modulus of geopolymer concrete after standard curing were studied through laboratory tests.The results show that,with the increase of dry-wet cycle,the mass of geopolymer concrete specimen increases slightly at 20 dry-wet cycles,and then decreases gradually.The stress-strain curve of geopolymer concrete can be divided into three stages,linear growth stage,slow growth stage and slow decline stage,which correspond to the elastic deformation stage,elastic-plastic deformation stage and crushing stage respectively.The overall trend of the stress-strain curve is similar under different dry-wet cycles,and the peak stress and residual stress decrease with the increase of dry-cycle.With the increase of dry-wet cycle,the compressive strength and elastic modulus of geopolymer concrete gradually decrease,which reflects that sulfate erosion will lead to the strength loss of geopolymer concrete,causing its internal damage,thus having adverse effects on it.
作者
唐志宇
李作华
TANG ZhiYu;LI Zuohua(College of Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Energy and Building Environment,Guilin University of Aerospace Technology,Gaulin 541004,China)
出处
《混凝土》
CAS
北大核心
2021年第7期14-17,共4页
Concrete
基金
国家自然科学基金(51868006)
广西高校中青年教师科研基础能力提升项目(2021KY0803)
广西高校中青年教师科研基础能力提升项目(2019KY0800)。
