Effect of LDH Nano-Flakes on the Mechanical and Transport Properties of Lightweight Concrete

2018 ◽  
pp. 3-16 ◽  
Author(s):  
Z. Y. Qu ◽  
Q. L. Yu ◽  
H. J. H. Brouwers
Keyword(s):  
Transport Properties ◽  
Lightweight Concrete

scholarly journals Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3078 ◽  
Author(s):  
Mohamed Abd Elrahman ◽  
Sang-Yeop Chung ◽  
Pawel Sikora ◽  
Teresa Rucinska ◽  
Dietmar Stephan
Keyword(s):  
Transport Properties ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Solid Content ◽  
Lightweight Aggregate Concrete ◽  
Strength Development ◽  
Dry Density ◽  
Pore Characteristics ◽  
Positive Effects ◽  
Air Void

This study presents the results of an experimental investigation of the effects of nanosilica (NS) on the strength development, transport properties, thermal conductivity, air-void, and pore characteristics of lightweight aggregate concrete (LWAC), with an oven-dry density <1000 kg/m3. Four types of concrete mixtures, containing 0 wt.%, 1 wt.%, 2 wt.%, and 4 wt.% of NS were prepared. The development of flexural and compressive strengths was determined for up to 90 days of curing. In addition, transport properties and microstructural properties were determined, with the use of RapidAir, mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM) techniques. The experimental results showed that NS has remarkable effects on the mechanical and transport properties of LWACs, even in small dosages. A significant improvement in strength and a reduction of transport properties, in specimens with an increased NS content, was observed. However, the positive effects of NS were more pronounced when a higher amount was incorporated into the mixtures (>1 wt.%). NS contributed to compaction of the LWAC matrix and a modification of the air-void system, by increasing the amount of solid content and refining the fine pore structure, which translated to a noticeable improvement in mechanical and transport properties. On the other hand, NS decreased the consistency, while increasing the viscosity of the fresh mixture. An increment of superplasticizer (SP), along with a decrement of stabilizer (ST) dosages, are thus required.

Spectroscopic Diagnostics of Tokamaks

1988 ◽  
Vol 102 ◽  
pp. 165-174
Author(s):  
C. de Michelis
Keyword(s):  
Transport Properties ◽  
Power Losses ◽  
Spectroscopic Diagnostics ◽  
Important Concern

AbstractImpurities being an important concern in tokamaks, spectroscopy plays a key role in their understanding. Techniques for the evaluation of concentrations, power losses and transport properties are surveyed, and a few developments are outlined.

Structure and Orientation of As Precipitates in LT-MBE Grown GaAs

1991 ◽  
Vol 49 ◽  
pp. 900-901 ◽  
Author(s):  
Alain Claverie ◽  
Zuzanna Liliental-Weber
Keyword(s):  
Transport Properties ◽  
Layer Thickness ◽  
Growth Temperature ◽  
Low Temperatures ◽  
Lattice Parameter ◽  
Crystalline Quality ◽  
Insulating Properties ◽  
Lt Gaas

GaAs layers grown by MBE at low temperatures (in the 200°C range, LT-GaAs) have been reported to have very interesting electronic and transport properties. Previous studies have shown that, before annealing, the crystalline quality of the layers is related to the growth temperature. Lowering the temperature or increasing the layer thickness generally results in some columnar polycrystalline growth. For the best “temperature-thickness” combinations, the layers may be very As rich (up to 1.25%) resulting in an up to 0.15% increase of the lattice parameter, consistent with the excess As. Only after annealing are the technologically important semi-insulating properties of these layers observed. When annealed in As atmosphere at about 600°C a decrease of the lattice parameter to the substrate value is observed. TEM studies show formation of precipitates which are supposed to be As related since the average As concentration remains almost unchanged upon annealing.

Modification of structural and transport properties in epitaxial YBa2CU3Ox films by pulsed laser irradiation

1993 ◽  
Vol 3 (12) ◽  
pp. 2173-2188
Author(s):  
N. G. Chechenin ◽  
A. V. Chernysh ◽  
V. V. Korneev ◽  
E. V. Monakhov ◽  
B. V. Seleznev
Keyword(s):  
Transport Properties ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Pulsed Laser Irradiation

Transport properties of Ni81.5B18.5 - YP y amorphous alloys

1989 ◽  
Vol 50 (21) ◽  
pp. 3233-3242 ◽  
Author(s):  
M. Očko ◽  
E. Babić
Keyword(s):  
Transport Properties ◽  
Amorphous Alloys

Transport properties of evaporated versus sputtered amorphous germanium films

1980 ◽  
Vol 41 (10) ◽  
pp. 1173-1181 ◽  
Author(s):  
M.-L. Theye ◽  
A. Gheorghiu ◽  
T. Rappeneau ◽  
A. Lewis
Keyword(s):  
Transport Properties ◽  
Amorphous Germanium ◽  
Germanium Films

On the transport properties of a dense fully-ionized hydrogen plasma. I. The semi-classical approach

1988 ◽  
Vol 49 (7) ◽  
pp. 1147-1159 ◽  
Author(s):  
V. Zehnlé ◽  
B. Bernu ◽  
J. Wallenborn
Keyword(s):  
Transport Properties ◽  
Hydrogen Plasma ◽  
Classical Approach
Sign in / Sign up

Export Citation Format

Share Document