620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Refine
Document Type
- Article (peer reviewed) (12) (remove)
Has Fulltext
- no (12)
Is part of the Bibliography
- no (12)
Keywords
- Timber engineering (4)
- Laminated veneer (3)
- FVK (2)
- Temporary soil nailing (2)
- Bismut (1)
- Bismuth (1)
- Cement alkaline attack (1)
- Digitalisierung (1)
- Engineering (1)
- High‐alkaline environment (1)
- Industrie 4.0 (1)
- Mathematical optimization (1)
- Microelectronics (1)
- OLED (1)
- Organische Halbleiter (1)
- Ressourcenefficienz (1)
- Stoffstromanalyse (1)
- Water saturation (1)
- Wertstromanalyse (1)
- Wood and wood products (1)
- cement‐coated beech Laminated Veneer Lumber (1)
- characterization (1)
- degradation (1)
- digitaler Zwilling (1)
- emissions (1)
- fiber composites (1)
- manufacturing process (1)
- p-Dopants (1)
- p-Dotanden (1)
- pattern analysis (1)
- recycling (1)
- renewable materials (1)
- resource efficiency (1)
- sustainability (1)
Circular hollow sections of beech-laminated veneer lumber (LVL) for the use as temporary geotechnical soil nailing systems are currently being developed. Due to their permanent subsoil cement embedment, investigations of the bond line quality of the timber sections are essential. This paper presents the bonding properties of flat and curved beech LVL after cyclic conditioning in a water–cement grout solution aimed at inducing short- and long-term alkaline attack of the timber. In total, 409 and 69 samples were tested in tensile shear tests after short-term and long-term conditioning, respectively.
Three different adhesive systems, a one-component polyurethane adhesive, a melamine–urea–formaldehyde adhesive and a melamine–urea–formaldehyde adhesive modified by means of (polyvinyl)-acetate adhesive were investigated and compared. Short-term conditioning by submersion in boiling cement suspension was found to be a reliable method for testing the bonding performance rather than long-term conditioning. In the case of tensile shear tests of samples subjected to long-term treatment, wood material strength was the decisive criterion. Generally, tensile shear test samples of all investigated adhesives achieved reliable bonding for a pressing force up to 1.0 MPa. No relationship was recognised between the determined bonding failure and the wood properties tensile shear strength, wood failure percentage, fracture pattern and bulk density of veneers adjacent to the bond line.
For the determination of the bond line integrity of curved veneer poles, it was necessary to test bonding quality in a combined test using curved and flat samples and to compare tensile shear strength with data determined on reference samples in the same veneer population without bond line.
A DDR2 SDRAM test setup implemented on the Griffin III ATE test system from HILEVEL Technologies is used to analyse the row hammer bug. Row hammer pattern experiments are compared to standard retention tests.
The analysis confirms that the row hammer effect is caused by a charge excitation process depending on the number of stress activation cycles. The stress has to occur in the local neighborhood of the cells under test.
Shallow impurity levels support the responsible charge carrier transport process in the used DDR2 SDRAM technology