Dielectric permeability and dielectric losses of NaA zeolite containing less than 5% of the maximum adsorbed amount of water

1970 ◽  
Vol 19 (5) ◽  
pp. 926-928
Author(s):  
V. M. Kopylova ◽  
V. M. Fedorov ◽  
M. M. Dubinin ◽  
I. V. Zhilenkov
Keyword(s):  
Dielectric Permeability ◽  
Dielectric Losses ◽  
Naa Zeolite ◽  
Adsorbed Amount

The Influence of the Ash Addition from Thermal Power Plant on the Mechanical, Thermal and Dielectric Characteristics of Mortars

2018 ◽  
Vol 69 (8) ◽  
pp. 2040-2044
Author(s):  
Georgeta Velciu ◽  
Virgil Marinescu ◽  
Adriana Moanta ◽  
Ladislau Radermacher ◽  
Adriana Mariana Bors
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Power Plant ◽  
Cement Mortar ◽  
Thermal Power ◽  
Total Content ◽  
Ash Content ◽  
Dielectric Losses ◽  
Dielectric Characteristics ◽  
Cement Mortars

The influence of fly ash adittion (90 % fraction [ 100 mm) on the cement mortar characteristics was studied. The XRD, XRF, SEM and FTIR determinations indicated that fly ash used has a hollow microstructure of microsphere and cenosphere whose total content in SiO2, Al2O3 and Fe2O3 is 88.63 % and that of CaO and MgO of 8.55 %. The mechanical, thermal and dielectric determinations made on mortar samples with content of fly ash in the 0-40 % range have highlighted fact that the mechanical strength of cement mortars is maximal at 20 %, the increase in fly ash content leads to a decrease in relative density and thermal conductivity as well as and to increased dielectric losses tgd.

The Flowability and Adsorption of Low Sulfate Cement with Superplasticizers

2013 ◽  
Vol 477-478 ◽  
pp. 904-907
Author(s):  
Ming Zhe An ◽  
Song Han
Keyword(s):  
Charge Density ◽  
Cement Paste ◽  
Water Demand ◽  
Cement Slurry ◽  
Sulfate Content ◽  
Standard Dosage ◽  
Slump Test ◽  
Adsorbed Amount ◽  
Lower Charge

The compatibility of low sulfate cement with naphthalene (NS) and polycarboxylate (PCE) type superplasticizers was discussed. The flowability of slurry and the adsorption of superplasticizers (SP) were investigated by mini slump test and TOC. The results show that severe compatibility degeneration is caused by low sulfate content in cement slurry. The water demand of slurry, the standard dosage and adsorbed amount of SPs were dramatically raised. In the cement slurry with low sulfate content, polycarboxylate type superplasticizers presents better performance than naphthalene type. The PCE with lower charge density presents better robustness. It is recommended in the preparation of concrete to avoid the incompatibility problems caused by lack of sulfate in cement paste.

Sign in / Sign up

Export Citation Format

Share Document