Clinkered materials containing high concentrations of
{(C,K,N,M).sub.4(A,F,Mn,P,T,S).sub.3(cl,{overscore (S)})} (crystal X),
and {(C.sub.2S).sub.3(C{overscore (S)}).sub.3 Ca(f,cl) .sub.2} or
{(C.sub.2S).sub.3(C{overscore (S)}).sub.3Ca(f,cl).sub.2} (crystal Y),
and/or {C.sub.5S.sub.2{overscore (S)}) (crystal Z) directly from the
kiln, rapidly hardening ultra-high early strength cement including these
clinkered materials, methods for forming and using said compositions and
the cements so produced are claimed. The methods include the steps of
forming a mixture of raw material containing CaO, MgO, Al.sub.2O.sub.3,
Fe.sub.2O.sub.3, TiO.sub.2, Mn.sub.2O.sub.3, SiO.sub.2, SO.sub.3,
Na.sub.2O, K.sub.2O, P.sub.2O.sub.5 and F, respectively designated C, M,
A, F, T, Mn, S, {overscore (S)}, N, K, P and f, and heating said mixture
to an elevated temperature between 900.degree. C. and 1,200.degree. C.;
before determining average amount of crystals X, Y, and Z. Final mixtures
comprising these clinkers and hydraulic or portland type cement are made
to produce cement compositions having crystal X concentrations of
approximately 5% to 35% by weight, crystal Y concentrations of
approximately 5% to 40% by weight, and/or crystal Z concentrations of
approximately 5% to 40% by weight, with the remainder being hydraulic or
portland type cement. The cements so produced are rapid hardening and
exhibit high strengths ranging from 2,000 psi to 7,000 psi in one hour,
6,000 to 8,000 psi in one day and 9,000 to 12,000 psi in 28 days. They
are sulfate and sea-water attack resistant and have low heats of
hydration, minimal shrinkage, and high water impermeability. The methods
claimed also results in significant reduction in gaseous emissions
including SOx, NOx and COx.