Electrically conductive concrete and controlled low-strength materials

A composition that sets to produce a concrete, the composition comprising:

• from about 1% to about 30% by weight of portland cement;
• from about 1% to about 20% by weight of fly ash having a carbon content as measured by loss on ignition of greater than 12%;
• from about 40% to about 90% by weight of an aggregate selected from the group consisting of sand, crushed stone, taconite pellets, and mixtures thereof;
• and
• water in a sufficient amount such that the composition sets to a concrete having a compressive strength of at least 13.8 MPa,
• wherein the weight ratio of fly ash to portland cement in the composition is about 0.5:1 to about 0.8:1, and
• wherein all weight percentages are percent by weight of the total composition.

A composition that sets to produce a concrete, the composition comprising:

• from about 1% to about 30% by weight of portland cement;
• from about 1% to about 20% by weight of fly ash having a carbon content as measured by loss on ignition of greater than 12%;
• from about 1% to about 10% by weight of steel fibers;
• from about 40% to about 90% by weight of an aggregate selected from the group consisting of sand, crushed stone, taconite pellets, and mixtures thereof;
• and
• water in a sufficient amount such that the composition sets to a concrete having a compressive strength of at least 13.8 MPa,
• wherein all weight percentages are percent by weight of the total composition.