Encyclopædia Britannica, Τόμος 5Walter Yust Encyclopædia Britannica, 1960 |
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Σελίδα 108
... cement was , of course , quite differ- ent from modern portland cement , but nevertheless the colour and properties of concrete made from this cement were somewhat similar to Portland stone . By this time ( 1820-30 ) works were ...
... cement was , of course , quite differ- ent from modern portland cement , but nevertheless the colour and properties of concrete made from this cement were somewhat similar to Portland stone . By this time ( 1820-30 ) works were ...
Σελίδα 111
... cement from the grinding mills is conveyed to storage bins or silos by belt conveyors , screw conveyors , bucket elevators , or in recent installations by a screw conveyor - compressed air device known as a cement pump , which delivers ...
... cement from the grinding mills is conveyed to storage bins or silos by belt conveyors , screw conveyors , bucket elevators , or in recent installations by a screw conveyor - compressed air device known as a cement pump , which delivers ...
Σελίδα 113
... cement has been developed and is extensively used by the United States government . The compound composition of modified ce- ment is characterized by low tricalcium aluminate ( 3CaO.Al2O3 ) and high tetracalcium alumino ferrite ( 4CaO ...
... cement has been developed and is extensively used by the United States government . The compound composition of modified ce- ment is characterized by low tricalcium aluminate ( 3CaO.Al2O3 ) and high tetracalcium alumino ferrite ( 4CaO ...
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