摘要
为资源化利用西北地区工程建设开挖的弃方材料——戈壁集料,基于西北某机场扩建工程的戈壁集料,首先对戈壁集料基本物理性能及矿物成分进行分析,随后以水灰比、戈壁砂率、戈壁细集料种类及水泥浆量为变化参数,先后对戈壁集料混凝土的工作性能、破坏形态以及抗压强度进行研究。试验结果表明:戈壁集料含泥量高,其黏土矿物含量约20%且以吸水能力强的蒙皂石和伊利石为主;随水灰比减小,戈壁粗集料混凝土的坍落度减少,而抗压强度近似线性增大,与普通混凝土规律一致;同配合比下,全戈壁集料混凝土抗压强度高于戈壁粗集料混凝土,但前者的拌合物表现更黏稠;筛除粒径小于0.15 mm的戈壁细集料虽可小幅提高全戈壁集料混凝土的坍落度,但对抗压强度不利;随砂率增加,戈壁集料混凝土的坍落度增大,其抗压强度先增后减。最后,通过回归分析为戈壁集料混凝土配合比提供参考。
In order to make use of the gobi aggregate,the waste material excavated in the engineering construction in northwest China,it focused on the gobi aggregate of an airport expansion project in northwest China.Firstly,the basic physical properties and mineral components of gobi aggregates were analyzed,and then taking water cement ratio,gobi sand ratio,type of fine aggregate and amount of cementitious material as changing parameters,the working performance,failure mode and compressive strength of gobi aggregate concrete were studied successively.The results showed that gobi aggregates have a high mud content,and the clay minerals mainly contain smectite and illite with strong water absorption capacity about 20%.With the increased in water cement ratio,the slump decreased but the compressive strength increased linearly,which was consistent with the law of ordinary concrete.Under the same mix ratio,the compressive strength of all gobi aggregate concrete was higher than that of gobi coarse aggregate concrete,but the mixture of the former is more viscous.Although the slump of all gobi aggregate concrete could be slightly improved by screening out gobi fine aggregates with a particle size of less than 0.15 mm,the compressive strength was unfavorable.With the increase of gobi sand ratio,the compressive strength of concrete increased first and then decreased but the slump kept increasing.Finally,through regression analysis,suggestions on mix proportion design of gobi aggregate concrete were given.
作者
李超
李建文
麦麦提明·图尔迪麦麦提
廖浩宇
陈宗平
LI Chao;LI Jianwen;Maimaitiming·Tuerdimaimaiti;LIAO Haoyu;CHEN Zongping(China Construction Eighth Engineering Division,Co.,Ltd.,Shanghai 200135,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)
出处
《混凝土》
CAS
北大核心
2024年第1期101-106,共6页
Concrete
基金
国家自然科学基金(51578163)
广西科技基地与人才专项研究项目(桂科AD21075031)
广西八桂学者专项研究项目([2019]79号)。
关键词
戈壁集料混凝土
物理性能
矿物成分
抗压强度
设计建议
gobi aggregate concrete
physical properties
mineral components
compressive strength
design advice
