Bond Quality of Laminated Wood Made from Surian (Toona sinensis Roem) and Sengon (Paraserianthes falcataria (L.) Nielsen)

2017 ◽  
Vol 18 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Eka Mulya Alamsyah ◽  
Ihak Sumardi ◽  
Sutrisno . ◽  
Atmawi Darwis ◽  
Yoyo Suhaya
Keyword(s):  
Bond Quality ◽  
Paraserianthes Falcataria ◽  
Toona Sinensis

Experimental investigation of 0.6 in. diameter strand lifting loops

PCI Journal ◽  
2021 ◽  
Vol 66 (2) ◽  
pp. 71-87
Author(s):  
Sandip Chhetri ◽  
Rachel A. Chicchi ◽  
Andrew E. N. Osborn
Keyword(s):  
Failure Modes ◽  
Concrete Strength ◽  
Bond Stress ◽  
Pullout Capacity ◽  
Bond Quality ◽  
Concrete Blocks ◽  
Mohs Hardness ◽  
Side Face ◽  
Pullout Failure

Very little experimental data have been published relating to the pullout capacity of prestressing strand lifting loops. To address this gap in knowledge, 13 pullout tests were conducted on strand lifting loops with 0.6 in. (15.24 mm) diameter, 270 ksi (1860 MPa) strand. Straight and bent orientations were tested for single loops at different embedment depths. Loops were embedded in 12 in. (304.8 mm) wide and 44 in. (1117.6 mm) deep concrete blocks and subjected to monotonic, static loading until failure. Marginal bond quality of the strand (18.2 kip [81 kN]), Mohs hardness (3.6), and concrete strength (3000 psi [20.7 MPa]) resulted in an average bond stress value of 400 psi (2758 kPa) at failure. Most tests exhibited pullout failure modes and adequate ductility. Three loops tested at 32 in. (812.8 mm) embedment with 6 in. (152.4 mm), 90-degree bends experienced brittle side-face blowout failures. These failures were due to inclination of the lifting, which led to a reduced edge distance. A safe uniform bond stress of 199 psi (1372 kPa) is recommended for 0.6 in. diameter strand.

Effect of double-layer application on bond quality of adhesive systems

2018 ◽  
Vol 77 ◽  
pp. 501-509 ◽  
Author(s):  
Satoshi Fujiwara ◽  
Toshiki Takamizawa ◽  
Wayne W. Barkmeier ◽  
Akimasa Tsujimoto ◽  
Arisa Imai ◽  
...  
Keyword(s):  
Double Layer ◽  
Adhesive Systems ◽  
Bond Quality

scholarly journals Effect of Package Film on the Quality of Postharvest Chinese Toon Tender Shoots Storage

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Yongqing Zhu ◽  
Jia Gao
Keyword(s):  
Product Quality ◽  
Transmission Rate ◽  
Modified Atmosphere Packaging ◽  
Storage Conditions ◽  
Oxygen Transmission Rate ◽  
Toona Sinensis ◽  
Young Leaves ◽  
Storage Products ◽  
Polyethylene Bags

The young leaves and shoots of the Toona sinensis (A. Juss.) Roem. tree, called Chinese toon, are commonly eaten as a vegetable in China. This study was conducted to develop a modified atmosphere packaging (MAP) system for Chinese toon tender shoots and to evaluate the effect of film oxygen transmission rate (OTR) on package atmospheres and consequent product quality changes during storage. Fresh precooled Chinese toon tender shoots (25±0.5 g each) were packaged in sealed 10 cm × 15 cm polyethylene bags prepared with films of OTRs of 8.0, 11.6, 16.6, 21.4, or 29.5 pmol s−1 m−2 Pa−1 and stored at 4±0.5°C for 25 days. Evaluations included package atmospheres, tissue electrolyte leakage, color, and sensory attributes (overall visual quality, off-odor, texture, and marketability). Results indicated that the OTR of the package film significantly (P<0.05) affected package headspace gas composition, a⁎, hue angles, product quality, and shelf-life, under the tested package configurations and storage conditions. Packages with film OTR of 21.4 pmol s−1 m−2 Pa−1 attained stable O2 (8.4–10.0 kPa) and CO2 (2.2–3.0 kPa) levels by day 10, which were maintained through the end of storage; products stored in these packages maintained freshness with high overall quality scores.

How to Evaluate the Effect of Mud Cake on Cement Bond Quality of Second Interface?

2007 ◽  
Author(s):  
Ma Yong ◽  
Cui Mao Rong ◽  
Guo Yang ◽  
Shi Qing ◽  
Li Li
Keyword(s):  
Bond Quality ◽  
Mud Cake ◽  
Cement Bond Quality

Multi-Resolution Analysis of the Acousto-Ultrasonic Testing Signal for Composite Material Detection

2011 ◽  
Vol 65 ◽  
pp. 108-112
Author(s):  
Bin Jing ◽  
Chunan Ai ◽  
Yu Liu
Keyword(s):  
Adaptive Filtering ◽  
Characteristic Frequency ◽  
Composite Shell ◽  
Bond Quality ◽  
Multi Resolution Analysis ◽  
Material Detection ◽  
Resolution Analysis ◽  
Testing Signal ◽  
Stress Wave Factor

The AU technique is employed in this paper to test the specimen which is made up of composite shell and adiabatic layer; the noise in the tested signal is reduced by adaptive filtering; Multi-resolution analysis of the signal is achieved by wavelet transform. By comparing the ratio of the energy of signal in different frequency zones to the total energy, the characteristic frequency zone of the signal is gained. The characteristic frequency zone of the signal from specimen is evaluated by energy integral Stress Wave Factor (SWF). Flaws are found effectively, and the size of flaw can be evaluated qualitatively. The validity of AU test for bond quality of the structure is approved in the experiments.

scholarly journals Application of stress based NDT methods for concrete repair bond quality control

2015 ◽  
Vol 63 (1) ◽  
pp. 77-85 ◽  
Author(s):  
A. Garbacz
Keyword(s):  
Stress Waves ◽  
Test Method ◽  
Repair System ◽  
Repair Material ◽  
Bond Quality ◽  
Substrate Roughness ◽  
Concrete Repair ◽  
Factors Affecting ◽  
Field Assessment

Abstract Adhesion in repair systems is one of the most important factors affecting their durability. Elaboration of a reliable nondestructive test method to perform an adhesion mapping is one of the most important tasks. A majority of NDT methods applicable for the assessment of concrete structures are based on the propagation of various types of stress waves. In this paper, the influence of the repair material type (polymer-cement or polymer) and quality of the concrete substrate (roughness, microcracking, not cleaned surface) upon propagation of stress waves in a repair system was studied in view of developing a reliable NDT procedure for the field assessment of bond quality in concrete repairs.

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