Electrically conductive concrete and controlled low-strength materials

A composition capable of setting 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;
• and
• water in a sufficient amount such that the composition sets to a concrete having a compressive strength of at least 13.8 MPa (2000 psi.),
• wherein all weight percentages are percent by weight of the total composition.

A method for lowering the electrical resistivity of a material formed from a self-compacting, cementitious flowable fill composition, the material having a compressive strength of 8.3 MPa (1200 psi.) or less, the method comprising:

• preparing a mixture including portland cement and water;
• including fly ash having a carbon content as measured by loss on ignition of greater than 12% in the mixture to form the self-compacting, cementitious flowable fill composition;
• and
• allowing the composition to set to produce the material having a compressive strength of 8.3 MPa (1200 psi.) or less.

A method for lowering the electrical resistivity of a concrete, the concrete having a compressive strength of at least 13.8 MPa (2000 psi.), the method comprising:

• preparing a mixture including portland cement, aggregate, and water;
• including fly ash having a carbon content as measured by loss on ignition of greater than 12% in the mixture;
• and
• allowing the mixture to set to produce a concrete having a compressive strength of at least 13.8 MPa (2000 psi.).