Would you please tell me more about connection between concetration of C3A to the moisture in the cement.

Thank you. 

C3A is moisture sensitive mineral.In presence of moisture the C3A of clinker and sulphate of the gypsum from ettringite(3CaO.Al2O3.3CaSO4.32H2O).Ettringite develop in the shape of needle like crystals and causes limping of cement.

You may also check alkali sulphate(K2SO4) in clinker.In presence of moisture and calcium sulphate(Gypsum/hemihydrate) .K2SO4 reacts to form syngenite(K2SO4.CaSO4.H2O).Syngenite also develop in the shape of needle like crystals and cause lumping of cement just like ettringite.Syngenite generally formed in plant which have high K2O in limestone.