摘要
采用100分离式霍普金森压杆(SHPB)试验装置,研究了不同纤维掺量(体积分数,下同)的陶瓷纤维混凝土(CRFRC)冲击压缩特性.采用厚度为1mm,不同直径的H62黄铜波形整形器对入射波进行整形,确保了试验过程中的应力均匀性,实现了恒应变率加载.结果表明:随着纤维掺量的增加,CRFRC的峰值应力和峰值应变明显增加,应力应变曲线下降段由缓变陡;冲击压缩强度和能量吸收特性较素混凝土显著提高,当应变率为(74±2)s-1时,纤维掺量为0.3%的CRFRC能量吸收率明显高于素混凝土.另外,拟合了动态强度增长因子随应变率对数变化的关系式.
The impact compressive properties of concrete reinforced with various volume fractions of ceram ic fiber were studied using 100mmdiameter split Hopkins0n pressure bar（SHPB） apparatus. H62 brass pulse shapers of 1 mm thick and different diameter were adopted to ameliorate the incident wave so as to obtain dynamic stress equilibrium and a nearly constant strain rate over most of the test duration. The tests reveal that with the volume fraction of ceramic fiber increasing, the peak stress and peak strain en hance prominently and the descending segment of stressstrain curves turn steep. The addition of short ce ramie fiber can significantly improve ＂the impact compressive strength and energyabsorption capacity of the concrete and the relationship between dynamic strength increase ratio and the logarithm of strain rate can be expressed by double linear approximations. When the strain rate is（74t2） s1 , the energy absorption rate of concrete reinforced by ceramic fiber of volume fraction of 0.3% is superior to plain concrete remarkably.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2013年第2期237-243,共7页
Journal of Building Materials
基金
国家自然科学基金资助项目(51078350)
陕西省自然科学基金资助项目(SJ08E210)
关键词
陶瓷纤维混凝土
动态强度增长因子
过渡应变率
比能量吸收
ceramic fiber reinforced concrete （CRFRC）
dynamic strength increase ratio
transient stainrate
specific energy absorption（SEA）
