低温玄武岩纤维混凝土抗冲击性能研究  

Study on Impact Resistance of Low Temperature Basalt Fiber Concrete

作　　者：耿志晨 崔云鹏[1] 邓玉姣 李浪 GENG Zhichen;CUI Yunpeng;DENG Yujiao;LI Lang(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159

出　　处：《沈阳理工大学学报》2023年第3期75-81,共7页Journal of Shenyang Ligong University

基　　金：国家自然科学基金项目(51972214);沈阳理工大学引进高层次人才科研支持计划项目。

摘　　要：对设计强度为C40的不同体积掺量短切玄武岩纤维混凝土试块进行28 d常温养护后再分别进行14 d常温和14 d低温养护,并利用分离式霍普金森压杆研究试块在不同冲击气压下的抗冲击性能。结果表明:随着冲击气压的提高,试块被冲击后的碎块表观长度减小;随着玄武岩纤维掺量的增加,试块的峰值应力先显著提高后有所下降,常温和低温养护下的纤维最佳掺量均为0.30%,低温养护下试块的峰值应力高于常温养护;玄武岩纤维的加入可降低试块的峰值应变率,且低温养护下试块的峰值应变率低于常温养护;常温养护下掺入纤维的试块比吸能均高于素块,低温养护下玄武岩纤维体积掺量为0.30%时试块的比吸能最大,具有较好的延展性和韧性;纤维掺量为0.30%的试块具有较佳的抗冲击性能。The test blocks of short-cut basalt fiber reinforced concrete with design strength of C40 were cured for 28 days at room temperature,and then cured for 14 days at room temperature and 14 days at low temperature,respectively.The split Hopkinson pressure bar was used to study the impact resistance of the test blocks under different impact pressure.The results showed that the apparent length of the fragments decreased with the increase of the impact pressure.With the increase of basalt fiber content,the peak stress of the test block firstly increased significantly and then decreased.The optimal fiber content under normal temperature and low temperature curing was 0.30%,and the peak stress of the test block under low temperature curing was higher than that under normal temperature curing.The addition of basalt fiber can reduce the peak strain rate of the test block,and the peak strain rate of the test block under low temperature curing is lower than that under normal temperature curing.Under normal temperature curing,the specific energy absorption of the test block with fiber is higher than that of the plain block.When the volume content of basalt fiber under low temperature curing is 0.30%,the specific energy absorption of the test block is the largest,and it has good ductility and toughness.The sample with 0.30%fiber content has the best impact resistance.

关 键 词：低温混凝土 玄武岩纤维 抗冲击性能 分离式霍普金森压杆 

分 类 号：TB332[一般工业技术—材料科学与工程]