摘要
对玄武岩纤维-矿渣粉-粉煤灰混凝土(BF-SP-FAC)进行了单轴抗压试验、劈裂抗拉试验、冻融循环试验、气孔结构测试试验和SEM分析。研究了不同冻融次数下BF-SP-FAC冻融损伤量、抗压强度、抗拉强度的变化,分析了气孔结构参数(含气量、气孔比表面积、气泡间距系数和气泡平均弦长)与BF-SP-FAC抗压强度、抗拉强度、冻融损伤量的关系,运用灰关联熵分析法讨论了BF-SP-FAC气孔结构参数对抗压强度、抗拉强度、冻融损伤量影响的主次关系。结果表明:相同冻融次数下,与其他纤维掺量相比,玄武岩纤维掺量为0.18vol%时,BF-SP-FAC抗冻性能较好,抗压强度和抗拉强度最高;在相同玄武岩纤维掺量下,随含气量、气泡间距系数、气泡平均弦长的增大,BF-SP-FAC抗压强度和抗拉强度减小,而冻融损伤量增大;随气孔比表面积的增加,BF-SP-FAC抗压强度和抗拉强度增大,而冻融损伤量减小。气孔比表面积是影响BF-SPFAC强度的最主要因素,而气泡平均弦长是影响BF-SP-FAC冻融损伤量的主要因素,最小灰熵关联度分别为0.998和0.993。气孔结构参数与强度、冻融损伤关系的建立,可预估混凝土的强度与冻融损伤。
The test on uniaxial compression,split tension,freeze-thaw cycle,air-void and SEM analysis were carried out on basalt fiber-slag powder-fly ash concrete(BF-SP-FAC).The changes of damage amount,compressive strength and tensile strength of BF-SP-FAC were studied under different freeze-thaw cycles.The relationships of airvoid structure parameters(air content,specific surface area,spacing factor and average chord length)with compressive strength,tensile strength of BF-SP-FAC were analyzed.The effects of the air-void structure parameters on the compressive strength,tensile strength and damage amount were investigated by grey correlation entropy analysis.The results show that under the same freezing and thawing times,compared with other fiber dosage,BF-SPFAC mixed with basalt fiber of 0.18 vol%has the best frost resistance and the highest compressive strength and tensile strength.Under the same fiber content,the compressive and tensile strength of BF-SP-FAC decrease with the increase of air content,spacing factor,and average chord length,while the damage amount increases.The compressive strength and tensile strength of BF-SP-FAC increase with the increase of specific surface area,while the damage amount decreases.The most important factor to the compressive strength and tensile strength of BF-SPFAC is specific surface area,the main factor to the damage amount of BF-SP-FAC is the average chord length.The minimum grey entropy correlations are 0.998 and 0.993,respectively.The establishment of relationships among airvoid structure parameters,strength and freeze-thaw damage can predict the strength and freeze-thaw damage of concrete.
作者
吴倩云
马芹永
王莹
WU Qianyun;MA Qinyong;WANG Ying(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Engineering Research Center of Underground Mine Construction,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2021年第3期953-965,共13页
Acta Materiae Compositae Sinica
基金
安徽省高校领军人才团队资助项目(No.2016-16)。
关键词
玄武岩纤维
矿渣粉
粉煤灰混凝土
损伤量
力学性能
微观结构
气孔结构参数
灰熵关联度
basalt fiber
slag powder
fly ash concrete
damage amount
mechanical properties
microstructures
air voids structure parameters
grey entropy correlation
