Concrete mix containing coal ash and organic plant ash

A composition comprising cement and ash, wherein (i) the ash consists essentially of (a) coal ash and (b) organic plant ash comprising less than 55 wt. % silica, and (ii) the weight ratio of ash:cement is less than about 1 (weight parts ash divided by weight parts cement).

A method of preparing a concrete mix comprising mixing cement and ash that consists essentially of coal ash and (i) woody tissue ash or (ii) organic plant ash containing less than 55 wt. % silica, wherein the weight ratio of ash:cement is less than about 1 (weight parts ash divided by weight parts cement).

A method of preparing a concrete mix comprising mixing cement, coal ash, and (i) woody tissue ash or (ii) organic plant ash containing less than 55 wt. % silica, sequentially or simultaneously and in any order, wherein (a) the concrete mix is substantially free of ashes from any other source, and (b) the weight ratio of ash:cement is less than about 1 (weight parts ash divided by weight parts cement).

A composition comprising:

• a. cement;
• and
• b. ash, wherein (i) the ash consists essentially of ash from coal and woody tissue sources, and (ii) the weight ratio of coal ash to woody tissue ash is from about 1000 to about 10 (weight parts coal ash divided by weight parts woody tissue ash).

A composition comprising cement and ash, wherein (i) the ash consists essentially of coal ash and organic plant ash comprising less than 55 wt. % silica, and (ii) the weight ratio of coal ash to organic plant ash is from about 1000 to about 10 (weight parts coal ash divided by weight parts organic plant ash).