초록 ▼

Compositions are provided for increasing the electrical conductivity of concrete or controlled low-strength materials (flowable fill). One composition sets to produce a concrete and includes from 1% to 30% by weight of portland cement; from 1% to 30% by weight of fly ash having a carbon content as m

Compositions are provided for increasing the electrical conductivity of concrete or controlled low-strength materials (flowable fill). One composition sets to produce a concrete and includes from 1% to 30% by weight of portland cement; from 1% to 30% by weight of fly ash having a carbon content as measured by loss on ignition of greater than 12%; from 40% to 90% by weight of an aggregate; from 0.1% to 20% by weight of carbon fibers; and water in a sufficient amount such that the composition sets to a concrete. Another composition is a self-compacting, cementitious flowable fill composition that includes from 1% to 30% by weight of portland cement; from 5% to 85% by weight of fly ash; from 0.1% to 20% by weight of carbon fibers; and water in a sufficient amount such that the composition sets to a material having a compressive strength of 8.3 MPa or less.

대표청구항 ▼

1. 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 30% 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 wei

1. 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 30% 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;from about 0.1% to about 20% by weight of carbon fibers; andwater 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. 2. The composition of claim 1 wherein:the composition sets to a concrete having an electrical resistivity of not more than about 30,000 ohm-centimeters. 3. The composition of claim 1 wherein:the composition sets to a concrete having an electrical resistivity of not more than about 10,000 ohm-centimeters. 4. The composition of claim 1 wherein:the composition sets to a concrete having an electrical resistivity of not more than about 1,000 ohm-centimeters. 5. The composition of claim 1 comprising:from about 1% to about 20% by weight of portland cement;from about 1% to about 20% by weight of fly ash having an average carbon content as measured by loss on ignition of greater than 12%;from about 40% to about 90% by weight of aggregate;from about 0.1% to about 10% by weight of carbon fibers; andfrom about 5% to about 50% by weight of water. 6. The composition of claim 1 comprising:from about 1% to about 10% by weight of portland cement;from about 1% to about 10% by weight of fly ash having an average carbon content as measured by loss on ignition of greater than 12%;from about 60% to about 80% by weight of aggregate;from about 0.1% to about 5% by weight of carbon fibers; andfrom about 5% to about 35% by weight of water. 7. The composition of claim 1 comprising:from about 1% to about 10% by weight of portland cement;from about 1% to about 10% by weight of fly ash having an average carbon content as measured by loss on ignition of greater than 12%;from about 30% to about 40% by weight of a fine aggregate having a particle size of 9.5 millimeters or less;from about 30% to about 40% by weight of a coarse aggregate having a particle size greater than 9.5 millimeters;from about 0.1% to about 5% by weight of carbon fibers; andfrom about 5% to about 20% by weight of water. 8. The composition of claim 7 further comprising:from about 1% to about 10% by weight of a water reducing admixture. 9. A self-compacting, cementitious flowable fill composition comprising:from about 1% to about 30% by weight of portland cement;from about 5% to about 85% by weight of fly ash;from about 0.1% to about 20% by weight of carbon fibers; andwater in a sufficient amount such that the composition sets to a material having a compressive strength of 8.3 MPa or less,wherein all weight percentages are percent by weight of the total composition. 10. The composition of claim 9 wherein the fly ash has a carbon content as measured by loss on ignition of greater than 12%. 11. The composition of claim 9 wherein:the composition sets to a material having a compressive strength of 2.1 MPa or less. 12. The composition of claim 9 wherein the composition comprises:from about 1% to about 30% by weight of portland cement;from about 5% to about 85% by weight of fly ash having a carbon content as measured by loss on ignition of greater than 12%;from about 0.1% to about 20% by weight of carbon fibers; andwater in a sufficient amount such that the composition sets to a material having a compressive strength of 8.3 MPa or less,wherein all weight percentages are percent by weight of the total composition. 13. The composition of claim 12 wherein:the composition further includes from about 40% to about 90% by weight of an aggregate. 14. The composition of claim 13 wherein:the aggregate is selected from concrete sand, crushed limestone, and mixtures thereof. 15. The composition of claim 9 wherein:the composition sets to a material having an electrical resistivity of not more than about 6000 ohm-centimeters. 16. The composition of claim 9 wherein:the composition sets to a material having an electrical resistivity of not more than about 1000 ohm-centimeters. 17. The composition of claim 9 wherein:the composition sets to a material having an electrical resistivity of not more than about 100 ohm-centimeters. 18. The composition of claim 9 wherein the composition comprises:from about 1% to about 20% by weight of portland cement;from about 5% to about 45% by weight of fly ash having an average carbon content as measured by loss on ignition of greater than 12%;from about 0.1% to about 10% by weight of carbon fibers; andfrom about 25% to about 95% by weight of water,wherein all weight percentages are percent by weight of the total composition. 19. The composition of claim 9 wherein the composition comprises:from about 1% to about 10% by weight of portland cement;from about 20% to about 30% by weight of fly ash having an average carbon content as measured by loss on ignition of greater than 12%;from about 0.1% to about 5% by weight of carbon fibers; andfrom about 40% to about 90% by weight of water,wherein all weight percentages are percent by weight of the total composition. 20. The composition of claim 9 wherein the composition comprises:from about 1% to about 10% by weight of portland cement;from about 20% to about 30% by weight of fly ash having an average carbon content as measured by loss on ignition of greater than 12%;from about 0.1% to about 5% by weight of carbon fibers; andfrom about 55% to about 75% by weight of water,wherein all weight percentages are percent by weight of the total composition.