Patent ID: 8562734

Claim:
A low-calcium-cementitious material having a calcium oxide content less than or equal to 10 wt %, wherein the low-calcium-cementitious material is capable of being processed at room temperature to form a low calcium cement, wherein the crystalline phase of the low-calcium-cementitious material harden at room temperature is characterized to be mullite, the low-calcium-cementitious material comprising: a low calcium fly ash having a calcium oxide less than or equal to 10 wt %, wherein the weight percent of the low-calcium-content fly ash based on the total weight of the low-calcium-cementitious material is between 30 wt % and 95 wt %; a sodium hydroxide, wherein the weight percent of the sodium hydroxide based on the total weight of the low-calcium-cementitious material is between 0.1 wt % and 55 wt %; and a magnesium carbonate, wherein the weight percent of the magnesium carbonate based on the total weight of the low-calcium-cementitious material is between 0.1 wt % and 30 wt %.