scholarly journals Development of the algorithm for modelling autoclave curing conditions and calculation of temperature fields into elements of sandwich structures

2020 ◽  
Vol 971 ◽  
pp. 022061
Author(s):  
B B Morozov ◽  
F A Nasonov ◽  
S V Bukharov
Keyword(s):  
Sandwich Structures ◽  
Temperature Fields ◽  
Curing Conditions ◽  
Autoclave Curing

scholarly journals USE OF FINE GROUND DUNE SAND AS A SUPPLEMENTARY CEMENTING MATERIAL

2014 ◽  
Vol 20 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Abdulrahman Alhozaimy ◽  
Omer Abdalla Alawad ◽  
Mohd Saleh Jaafar ◽  
Abdulaziz Al-Negheimish ◽  
Jamaloddin Noorzaei
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Calcium Hydroxide ◽  
Pozzolanic Reaction ◽  
Dune Sand ◽  
Cement Production ◽  
Curing Conditions ◽  
High Consumption ◽  
Autoclave Curing ◽  
Cementing Material

The process of Portland cement production is associated with high consumption of energy and resources. Therefore, there is a need to replace the Portland cement with environmental friendly materials. This study was conducted to determine the feasibility of using ground dune sand as cement replacement materials under different curing conditions. Portland cement was replaced by ground dune sand at five levels of replacement (0–40% by weight). The compressive strength of mortar under standard and autoclave curing conditions and the influence of different autoclave temperatures and durations were investigated. The microstructure of selected mixtures was analyzed by XRD and SEM. Results showed that the compressive strength under the standard curing decreased as the level of replacement increased. However, under autoclave curing compressive strength increased as the content of ground dune sand increased. XRD and SEM revealed the absence of calcium hydroxide and the formation of secondary calcium silicate hydrate. The improvement of compressive strength and the absence of calcium hydroxide under autoclave curing indicated that the pozzolanic reaction between silica of dune sand and calcium hydroxide occurred.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

Performance Of Geopolymer Concrete Under Various Curing Conditions

2012 ◽  
Vol 2 (3) ◽  
pp. 178-180 ◽  
Author(s):  
Shankar H Sanni ◽  
◽  
Dr. R. B. Khadiranaikar Dr. R. B. Khadiranaikar
Keyword(s):  
Geopolymer Concrete ◽  
Curing Conditions

Laser transmission welding with part adapted temperature fields

2012 ◽  
Author(s):  
Martin Devrient ◽  
Verena Wippo ◽  
Peter Jaeschke ◽  
Uwe Stute ◽  
Thomas Frick ◽  
...  
Keyword(s):  
Temperature Fields ◽  
Laser Transmission Welding
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