Comparison Study of Axial Behavior of RPC-CFRP Short Columns

In this paper, the axial behaviors of reactive powder     concrete (RPC) short  columns confined with carbon fiber reinforced polymer (CFRP) were   investigated. All the specimens have square cross section of 100 mm × 100   mm and length of 400 mm with aspect ratio 4. The experimental work consists   of three groups. The first group consists of six specimens of RPC with 2% micro steel fiber, without ordinary reinforcing steel and confining by zero, one and two layer of CFRP respectively. The second group consists of six    specimens of RPC with 2% micro steel fiber and minimum ordinary reinforcing  steel and confining by zero, one and two layers of CFRP respectively. The third  group consists of four specimens of RPC without micro steel fiber and ordinary  reinforcing steel and confining by one and two layers of CFRP respectively.  Experimental data for strength, longitudinal and lateral displacement and  failure mode were obtained for each test. The toughness (area under the curve) for each test was obtained by using numerical integration. The RPC columns confined with CFRP showed stiffer behavior compared with RPC columns without CFRP. The ultimate load of the RPC columns with 2% micro steel  fiber + two layers of CFRP + minimum ordinary reinforcement were more than that of the RPC columns with 2% micro steel fiber + minimum ordinary   reinforcement and without CFRP by about 1.333. 

Compressive Strength of Bottle-Shaped Compression Fields of Fiber Reinforced Concrete Members

Applying load to a structural member may result in a bottle-shaped compression field especially when the width of the loading is less than the width of bearing concrete members. At the Building and Construction Department – the University of Technology-Iraq, series tests on fibre reinforced concrete specimens were carried out, subjected to compression forces at the top and bottom of the specimens to produce compression field. The effects of steel fibre content, concrete compressive strength, transverse tension reinforcement, the height of test specimen, and the ratio of the width of loading plate to specimen width were studied by testing a total of tenth normal strength concrete blocks with steel fibre and one normal strength concrete block without steel fibres. Based on experimental results; all the test specimens failed with the splitting of concrete directly under the loading plate. Increased the uniaxial compressive strength of concrete increases the maximum bearing capacity of compressive stresses. The load-transverse deformation initially behaves linearly and shows some nonlinearity before failure. Addition of steel fibre to normal strength concrete or presence of transverse reinforcement, delay the reaching of maximum compressive stress after the presence of the first crack

Bond Strength Behavior in Rubberized Concrete

Through an experimental program of eighteen specimens presented in this paper, the bond strength between reinforcing bar and rubberized concrete that produced from adding waste tire rubber instead of natural aggregate. The fine and coarse aggregate were replaced in 0%, 25%, and 50% with the small piece of waste tire. Natural aggregate replacement ratio, rebar size, embedded length of rebar, yield stress of rebar, cover of concrete and concrete compressive strength were the parameters studied in this investigation. Ultimate bond stress, bond stress-slip response and failure modes were presented. The experimental results reported that a reduction of 19% in bond strength was noticed in rubberized concrete compared with conventional concrete. The bond strength of rubberized concrete increased when the concrete cover, compressive strength of concrete and yield stress of rebar were increased. Meanwhile, increase embedded length of rebar and rebar size decreases the bond strength. The push-out and splitting failure were the failure modes observed in rubberized concrete

Prevalence and surgical treatment of swelling occurring in Syrian Awassi sheep

This study was conducted on 29740 Syrian Awassi Sheep in different ages and of both genders. The percentage of prevalence swellings was 6.63%, that were caseous lymphadenitis, abscesses, hernias, hygromas, granulomas, heamtomas, and cysts with percentage of 4.875, 1.277, 0.305, 0.147, 0.016, 0.006, and 0.003%, respectively. The percentage of swellings according to gender was 9.91% for females and 1.90% for males. The prevalence percentage of caseous lymphadenitis was 7.525 and 1.065%, abscesses 1.824 and 0.491%, hernia 0.393 and 0.180% in female and male, respectively. There were different types of hernias, where sheep to be affected i.e. abdominal hernia (0.221%), umblica (0.030%), congenital cord umbilical (0.047%) and scrotal hernia (0.006%). The percentage of hygroma in males (0.142%) was higher than females (0.155%); however, the granuloma in females (0.022%) was higher than males (0.008%), and heamatoma was equal in both sexes (0.005%). In addition, the cysts in females (0.005%) was higher than males (0%). The result revealed that infections were higher in females than males in any type of swellings. © 2021 Iranian Society of Ichthyology