ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract In the process of developing an alkali-resistant glass composition to be used as reinforcing fibres with cement, a glass in the system SiO2-PbO- Al2O3-R2O (R = an alkali metal) was adopted after some trials. The glass composition which possesses low melting point (1350° C), fair alkaline resistance (particularly in the long term) and appears to have satisfactory fibrilizing qualities, has the composition: SiO2 = 34%, PbO = 59%, Al2O3 = 3%, K2O= 3.5% and Na2O = 0.5% (wt%). The alkaline durability of the glass fibres (coated and uncoated) was studied at pH 9, 10, 11 and 12. There was no significant difference in the amount of extraction of the constituents in the leaching solution at pH 9 and 10. At pH 11 and 12 the amount of extraction value of the constituents initially increased up to seven days and thereafter no significant increase could be detected. The thermodynamic stability of the different oxides under present investigation (SiO2, Al2O3, PbO) in aqueous solutions at different pH values has been discussed with standard thermochemical data and it has been shown that alkaline durability of the glass fibres can be satisfactorily correlated with thermodynamic predictions. There is a lower value in the extraction of the constituents in the case of coated fibres, than those of uncoated fibres. An epoxy resin with a cycloaliphatic diamine improves alkaline durability.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00551465
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