Development of New Patching Materials for Bridge and Tunnel Structures

2011 ◽  
Vol 228-229 ◽  
pp. 1-4
Author(s):  
Hong Wei ◽  
Su Lei Zhang ◽  
Ding Li Zhang
Keyword(s):  
Mechanical Property ◽  
High Performance ◽  
Performance Test ◽  
Strength Test ◽  
Resistance Test ◽  
Construction Technology ◽  
Test Results ◽  
Operational Principle ◽  
Chloride Resistance ◽  
Working Performance

According to requirements of the mechanical property, durability quality, working performance for patching materials for bridge and tunnel, the new patching material named high-performance tensile composite mortar (HTCM) has been developed. The HTCM is a product of cement-based mortar modified by polymer. The strength test, shrinkage test, chloride resistance test, carbonization resistance test and working performance test for HTCM are introduced in this paper. According to the test results, the components, characteristics, performance and operational principle of HTCM are listed in this paper. At last, the technical characteristics and advantages for HTCM are also discussed in terms of construction feasibility based on construction technology of sprayed mortar. It has been found that the HTCM can be used as an effective patching material for bridge and tunnel.

The Applicability Study on the FRP-Concrete Composite Bridge Deck for Cable-Stayed Bridges

2012 ◽  
Vol 525-526 ◽  
pp. 593-596
Author(s):  
Sung Tae Kim ◽  
Sung Yong Park ◽  
Keun Hee Cho ◽  
Jeong Rae Cho ◽  
Byung Suk Kim
Keyword(s):  
Performance Test ◽  
Bridge Deck ◽  
Structural Performance ◽  
Construction Technology ◽  
Test Results ◽  
Cable Stayed Bridge ◽  
Composite Bridge ◽  
Support Conditions ◽  
Composite Bridge Deck ◽  
Cable Stayed Bridges

This study is related to the FRP-concrete composite bridge deck for cable-stayed bridges developed by the Korea Institute of Construction Technology since 2007. This deck disposes a FRP panel at the bottom and is orthotropic owing to its fabrication through pultrusion process. In the cable-stayed bridge applying precast deck, support conditions occur at the cross beam and edge girder. Therefore, need is to verify the performances in the longitudinal and transverse directions when applying the orthotropic deck to cable-stayed bridges. Accordingly, specimens enabling to verify the performance in each direction are fabricated and subject to structural performance test. Based on the test results, the serviceability and applicability of the FRP-concrete composite deck to cable-stayed bridges are evaluated.

STUDY ON REDUCTION OF UNIT WATER AMOUNT OF CONCRETE WITH WASTE GYPSUM

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Atsushi Shimabukuro ◽  
Keiji Kuwajima
Keyword(s):  
High Performance ◽  
Fresh Concrete ◽  
Strength Test ◽  
Reducing Agent ◽  
Hardened Concrete ◽  
Fine Aggregate ◽  
Test Results ◽  
Waste Gypsum ◽  
Compressive Strength Of Concrete ◽  
Water Amount

This study discovered that the combination of waste gypsum and fly ash was capable of being used as fine aggregate in concrete. However, results showed that the unit water amount of the concrete with waste gypsum had to be increased to assure the designated workability. In general, if the unit water amount of concrete increases, hardened concrete will have various issues. Therefore, in this study, we try to reduce the unit water amount of this concrete by the high-performance AE (Air Entraining) water reducing agent containing viscosity improver. In order to investigate the effect of the above AE water reducing agent for the reduction of the unit water amount of the concrete with waste gypsum, the workability of above concrete with this agent from slump test and air containing test was examined. Also, compression, tension, and bending, of the concrete with waste gypsum from each strength test was measured. On the basis of the test results, it showed that we are able to assure the workability of fresh concrete with waste gypsum by the above agent used in this study, even if the unit water amount is reduced. Also, it was confirmed that the compressive strength of concrete with waste gypsum is equivalent to the strength of concrete without waste gypsum.

PENGARUH MODEL PEMBELAJARAN KELILING KELOMPOK (ROUND CLUB) TERHADAP KETERAMPILAN MENULIS LAPORAN PERJALANAN SISWA KELAS V SDN 01 NAGARI BUKIK SIKUMPA

2020 ◽  
Author(s):  
Wirda Linda
Keyword(s):  
Standard Deviation ◽  
Performance Test ◽  
Writing Skills ◽  
Learning Model ◽  
Homogeneity Test ◽  
Test Results ◽  
Class V ◽  
Average Value ◽  
Normality Test ◽  
Lecture Method

This research is motivated by the low desire of students in writing travel reports. The lack of students' knowledge of the report concept, the lack of students' knowledge of the 5W + 1H report points of good and correct language, the lack of students' knowledge of the spatial, time and topic pattern and not yet reached KKM 75. The method used by the teacher has not been interesting, lecture method. The purpose of this study is to describe the skills of writing travel reports by using Round Club learning model which is viewed from the aspect of understanding the report concept, the use of 5W +1H report points, the spatial, time, and topic pattern.The population of this study is the students of class V Lessons Year 2017/2018 which amounted to 2 classes with the number 80. The sample of research as much as two classes taken by the sample of propotional.Class V.1 as experimental class and class V.2 as control class. The research instrument used is performance test. Provide an assessment by specifying the subject of the 5W + 1H report, as well as the spatial, time and topic pattern. Data were analyzed by 't' test by first testing normality, homogeneity, and hypothesis testing.The results showed that the average control class 68 with more than enough qualifications with standard deviation 16.96. 83 experimental class with good qualification and standard deviation of 15.42 and there is a significant influence on the result of writing skill of class V SDN 01 Nagari Bukik SikumpaSubdistrict, Lima Puluh Kota. This is evidenced by the average value of writing skills in the experiment class higher than the average value in the control class. Normality test results indicate that the two sample classes of  Lo  values in the control class -0.2141 are smaller than the normal 0.190 Lt distributed. Homogeneity test results that the variation of this study is homogeneous at a real level of 0.05, because Ftable 2.16 > Fhitung 1.21 and the results of data analysis then obtained = 2.78 > 1.70 t table, so H0 rejected and H1 accepted. It can be concluded that there is Influence. Using  Learning  Model of Student Group Writing  Skills Travel Report of students of class V SDN 01 Nagari Bukik Sikumpa Subdistrict, Kabupaten Lima Puluh Kota.KeyWords: model pembelajaran round club, menulis laporan perjalanan.

scholarly journals Ex vivo evaluation of a multilayered sealant patch for watertight dural closure: cranial and spinal models

2021 ◽  
Vol 32 (8) ◽  
Author(s):  
A. Kinaci ◽  
S. van Thoor ◽  
S. Redegeld ◽  
M. Tooren ◽  
T. P. C. van Doormaal
Keyword(s):  
Ex Vivo ◽  
Resistance Test ◽  
Burst Pressure ◽  
Cerebrospinal Fluid Leakage ◽  
Computer Assisted ◽  
Dural Defect ◽  
Test Results ◽  
Physiological Conditions ◽  
Dural Attachment ◽  
The Mean

AbstractCerebrospinal fluid leakage is a frequent complication after cranial and spinal surgery. To prevent this complication and seal the dura watertight, we developed Liqoseal, a dural sealant patch comprising a watertight polyesterurethane layer and an adhesive layer consisting of poly(DL-lactide-co-ε-caprolactone) copolymer and multiarmed N-hydroxylsuccinimide functionalized polyethylene glycol. We compared acute burst pressure and resistance to physiological conditions for 72 h of Liqoseal, Adherus, Duraseal, Tachosil, and Tisseel using computer-assisted models and fresh porcine dura. The mean acute burst pressure of Liqoseal in the cranial model (145 ± 39 mmHg) was higher than that of Adherus (87 ± 47 mmHg), Duraseal (51 ± 42 mmHg) and Tachosil (71 ± 16 mmHg). Under physiological conditions, cranial model resistance test results showed that 2 of 3 Liqoseal sealants maintained dural attachment during 72 hours as opposed to 3 of 3 for Adherus and Duraseal and 0 of 3 for Tachosil. The mean burst pressure of Liqoseal in the spinal model (233 ± 81 mmHg) was higher than that of Tachosil (123 ± 63 mmHg) and Tisseel (23 ± 16 mmHg). Under physiological conditions, spinal model resistance test results showed that 2 of 3 Liqoseal sealants maintained dural attachment for 72 hours as opposed to 3 of 3 for Adherus and 0 of 3 for Duraseal and Tachosil. This novel study showed that Liqoseal is capable of achieving a strong watertight seal over a dural defect in ex vivo models.

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players

2021 ◽  
pp. 1-8
Author(s):  
Junta Iguchi ◽  
Minoru Matsunami ◽  
Tatsuya Hojo ◽  
Yoshihiko Fujisawa ◽  
Kenji Kuzuhara ◽  
...  
Keyword(s):  
Performance Test ◽  
Vertical Jump ◽  
American Football ◽  
Football Players ◽  
Jump Height ◽  
Test Results ◽  
Repetition Maximum ◽  
Vertical Jump Height ◽  
Division 1 ◽  
And Performance

BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.

scholarly journals Development of High-Performance Face Gear Set (Machining and Performance Test)

2011 ◽  
Vol 77 (775) ◽  
pp. 573-581
Author(s):  
Isamu TSUJI ◽  
Hiroshi GUNBARA ◽  
Kazumasa KAWASAKI ◽  
Yoshikazu ABE ◽  
Kazutaka SUZUKI ◽  
...  
Keyword(s):  
High Performance ◽  
Performance Test ◽  
Face Gear ◽  
And Performance
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