【单选题】The reaction of Portland cement with water is ( ).
【单选题】( )is produced by mixing a small amount of an air-en-training agent with ordinary Portland cement.
C.
Air-en-training cement
【单选题】____________ I arrived in South Africa , I was struck by the very great difference in the atmosphere of the country.
【单选题】Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with .
【简答题】The mass percent of tricalcium silicate ( ) is 50% in Portland cement, which acts as the binding agent in concrete. Calculate the mass percent of calcium in this Portland cement.