Experimental investigation on new absorption peaks of water vapor at high temperatures using terahertz spectroscopy

Abstract The results of an experimental investigation of the effect of water vapor/hydrogen environments on the mechanical properties of niobium, B-66 niobium alloy, tantalum, and Ta-10W alloy are presented. Tensile tests were conducted on specimens of these materials in water vapor/hydrogen environments with water vapor/hydrogen mixture ratios of 1 and 3. The water vapor/hydrogen environment caused strength reductions on tantalum and Ta—WW and ductility reductions on all four materials. The degree and causes of embrittlement were a complex function of temperature.

Download Full-text

Experimental Investigation of Adhesive Bonding for Post‐installed Rebars into Concrete at High Temperatures

IABSE Congress, New York, New York 2019: The Evolving Metropolis ◽

10.2749/newyork.2019.1169 ◽

2019 ◽

Author(s):

Thanyawat Pothisiri ◽

Pitcha Jongvivatsakul ◽

Vanichapoom Nantavong

Keyword(s):

Experimental Investigation ◽

High Temperatures ◽

Mechanical Behaviour ◽

Epoxy Resins ◽

Adhesive Bonding ◽

Elevated Temperatures ◽

Adhesive Bond ◽

Steel Rebar ◽

Pull Out ◽

Embedment Length

<p>The use of post‐installed rebars into existing reinforced concrete structures bonded with epoxy resins was constantly increasing due to the advantage of equivalent or even higher bearing capacities at service temperature, compared with conventional cast‐in‐place rebars. Previous studies have examined the effects of different parameters on the mechanical properties of bonded post‐installed rebars at normal temperature. These studies showed that, for rebar diameter equal to 10 mm, the load bearing capacity increases linearly with the embedment length up to 75 mm. However, upon exposure to high temperatures, the glass transition of epoxy resins may occur and affect the mechanical behaviour of the adhesive bond. Studying the mechanical behaviour of an adhesive anchor at high temperatures is therefore necessary. An experimental investigation is conducted herein to examine the characteristics of the adhesive bonding stress between steel rebar and concrete interface at elevated temperatures using a series of pull‐out tests with varying rebar diameters and embedment lengths.</p>

Download Full-text

Experimental investigation on heat transfer characteristics of soft clay at high temperatures

Japanese Geotechnical Society Special Publication ◽

10.3208/jgssp.cpn-16 ◽

2015 ◽

Vol 1 (2) ◽

pp. 40-44 ◽

Cited By ~ 1

Author(s):

Hehua Zhu ◽

Zhengfa Chen ◽

Yupeng Wang ◽

Zhiguo Yan

Keyword(s):

Heat Transfer ◽

Experimental Investigation ◽

High Temperatures ◽

Soft Clay ◽

Heat Transfer Characteristics ◽

Transfer Characteristics

Download Full-text

Terahertz Spectroscopy for Real-Time Monitoring of Water Vapor and CO Levels in the Producer Gas From an Industrial Biomass Gasifier

IEEE Transactions on Terahertz Science and Technology ◽

10.1109/tthz.2014.2357344 ◽

2014 ◽

Vol 4 (6) ◽

pp. 722-733 ◽

Cited By ~ 6

Author(s):

Hosein Bidgoli ◽

Sergey Cherednichenko ◽

Jens Nordmark ◽

Henrik Thunman ◽

Martin Seemann

Keyword(s):

Water Vapor ◽

Real Time ◽

Terahertz Spectroscopy ◽

Producer Gas ◽

Real Time Monitoring

Download Full-text

Origin of the Hydrogen Absorbed by Incoherent TiC Particles in Iron

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.233 ◽

2005 ◽

Vol 475-479 ◽

pp. 233-236 ◽

Cited By ~ 1

Author(s):

Kaneaki Tsuzaki ◽

Fu Gao Wei

Keyword(s):

Heat Treatment ◽

Water Vapor ◽

High Temperatures ◽

Thermal Desorption ◽

Hydrogen Absorption ◽

Room Temperature ◽

Trap Hydrogen ◽

Thermal Desorption Spectrometry ◽

Long Time

Hydrogen absorption of incoherent TiC particles that were once reported to be strong hydrogen traps in iron at room temperature was investigated by means of thermal desorption spectrometry (TDS). The results indicated that incoherent TiC particles in iron do not trap hydrogen at all at room temperature even they are cathodically charged for a long time. Only at high temperatures and in atmosphere containing hydrogen source, incoherent TiC particles can trap hydrogen. The origin of hydrogen trapped by incoherent TiC particles was justified to be water vapor in the atmosphere during heat treatment.

Download Full-text