Effect of concrete mixing parameters on propagation of ultrasonic waves

被引:79
作者
Abo-Qudais, SA [1 ]
机构
[1] Jordan Univ Sci & Technol, Dept Civil Engn, Irbid 22110, Jordan
关键词
concrete; mix design; aggregate; ultrasonic testing; PUNDIT;
D O I
10.1016/j.conbuildmat.2004.07.022
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
An experimental study was conducted to evaluate the effect of concrete aggregate gradation, water-cement ratio, and curing time on measured ultrasonic wave velocity (UPV). 30 x 30 x 10 cm Portland cement concrete slabs were cast for ultrasonic evaluation, while 10 cm diameter by 20 cm height cylinders were cast for compressive strength evaluation The slabs and cylinders were prepared using Portland cement and limestone aggregate. Two slabs were cast from each combination of coarse aggregate gradations and water cement ratio (0.40, 0.45, 0.50, and 0.55). Four ASTM gradations were considered, ASTM No: 8, 67, 56, and 4. These gradations have nominal maximum aggregate size 25, 4.75, 19.3, and 12.5 mm, respectively. The ultrasonic equipment used in this study was the portable ultrasonic non-destructive digital indicating tester (PUNDIT) with a generator having an amplitude of 500 V producing 54 kHz waves. The time needed to transfer the signal between the transducers was recorded and used to calculate the signal velocity, which was used as a parameter in the evaluation. Ultrasonic measurements were performed at 3, 7, 28, and 90 days after concrete casting. The results of the analysis indicated that water-cement ratio was found to have a significant effect on UPV. The UPV was found to decrease with the increase of water cement ratio. Aggregate gradation was also found to have significant effect on UPV. In general, the larger the aggregate size used in preparing Portland cement concrete, the higher the measured velocity of ultrasonic waves. Also, UPV was found to be increased as concrete curing time increased. Concrete compressive strength was found to be significantly affected by water-cement ratio and coarse aggregate gradation. Lower water-cement ratio produced higher concrete strength. Also, the concrete compressive strength increased as maximum aggregate size decreased. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:257 / 263
页数:7
相关论文
共 14 条
[1]  
ALAKHRAS N, 1995, THESIS VIRGINIA POLY
[2]  
Bungey JH, 1989, TESTING CONCRETE STR
[3]  
CNS Electronic Ltd, 1986, PUNDIT MAN US PORT U
[4]  
FACAOARU I, 1969, P S NOND TEST CONCR
[5]  
GALAN A, 1990, COMBINED ULTRASONIC
[6]   THE PROPAGATION AND ATTENUATION OF MEDIUM-FREQUENCY ULTRASONIC-WAVES IN CONCRETE - A SIGNAL ANALYTICAL APPROACH [J].
GAYDECKI, PA ;
BURDEKIN, FM ;
DAMAJ, W ;
JOHN, DG ;
PAYNE, PA .
MEASUREMENT SCIENCE AND TECHNOLOGY, 1992, 3 (01) :126-134
[7]  
LIMAYE HS, 1990, P ISA 90, V45, P485
[8]  
Lin YC, 2003, ACI MATER J, V100, P21
[9]  
Malhotra V.M., 1991, CRC HDB NONDESTRUCTI
[10]  
Malhotra V. M., 1976, ACI MONOGRAPH, V9