CaO-Al2O3-SiO2-MgO系合成水滓の活性
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Various mixtures of CaO-Al2O3-SiO2-MgO system were melted by oxy-acetylene flame and quenched into water. However, the mixtures that took the smaller Zachariasen's values “n” less than 0.33 could not be perfectly glassified. Those prepared glasses were finely ground with activator at the same time, and the respective compressive strengths were measured by the wet mortar method. The hydraulic activity of gehlenite glass became gradually larger with increasing the amount of Ca(OH)2 added, till the weight % of gehlenite and Ca(OH)2 was about equal, while wollastonite and akermanite glasses were poor in those activity. Various glasses having the composition of CS-C2S-C2AS system were examined also.And it was proposed that the equation would be able to show the good relation between the suitable quantity of Ca(OH)2 and the maximum compressive strength at the age of 7 or 28 days in any glasses. In the glass, consisting of a % of C2AS, b % of C2S, and of suitable weight % of Ca(OH)2, the maximum strength was given according to the next formula, i.e. 49a+b+11 (100-a-b). The activity coefficients of glass, derived from the strength at the ages of 28 days and 7 days, were given as follows respectively, 100a+96b+19 (100-a-b) and 77a+18b+7 (100-a-b), where the strength of C2AS after 28 days curing, 287Kg/cm2, was expressed as the standard of activity 100.The activity of the devitrified products of these glasses decreased to about 1/5 -1/10 of the case of glass state. The mixtures of C2AS glass and portland cement gave some complex results. Especially the mixture containing much more C2AS than the amount of portland cement could not harden although after long period, however the glasses of wollastonite and akermanite never brought such property. It may be thought that the higher the Al2O3 content in glass, the more the amount of activator is required, in order to display the full hydraulic activity.