Utilization of heavy oil ash to produce self-consolidated concrete

Patent metadata

Field	Value
Publication number	US-9266776-B2
Application number	US-201514837956-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Nov 10, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A heavy oil ash self-compacting concrete can include aggregate, heavy oil ash fines, water, and cement. The heavy oil ash can include more than 90% carbon, by weight. In an embodiment, the heavy oil ash self-compacting concrete can flow under its own weight and yet maintain a stable mixture consistency.

First claim

What is claimed is:

1. A method of disposing heavy oil ash comprising the steps of:
mixing Portland cement and water to form a cement mixture;
adding to the cement mixture heavy oil ash fines, wherein the heavy oil ash fines comprise at least 90% carbon and at least 80% of the heavy oil ash fines being finer than 45 microns (#325 sieve), wherein the heavy oil ash fines do not have cementitious or pozzolanic properties and do not react with lime; and
adding pozzolanic aggregate create a heavy oil ash self-compacting concrete that is capable of flowing under its own weight.

2. The method of claim 1 , wherein the cement releases calcium hydroxide after reacting with the water, and further comprising an absence of a reaction between the calcium hydroxide and the heavy oil ash.

3. The method of claim 1 , further comprising the step of curing, after the heavy oil ash self-compacting concrete is mixed, to produce a hardened self-compacting concrete, wherein the heavy oil ash prevents an ingress of water into the hardened self-compacting concrete.

4. The method of claim 1 , further comprising the step of pouring the heavy oil ash self-compacting concrete into a cone and then removing the cone, wherein the self-compacting concrete flows into a circle having a diameter of 650 nm to 800 mm.

5. The method of claim 1 , wherein the heavy oil ash is equal to 1% to 10% by weight of the self-compacting concrete.

6. The method of claim 1 , wherein the heavy oil ash is equal to 5% by weight of the self-compacting concrete.

7. The method of claim 6 , wherein the self-compacting concrete comprising 5% by weight heavy oil ash reduces the corrosion current density of steel in the self-compacting concrete.

8. The method of claim 7 , wherein the corrosion current density value of steel in the heavy oil ash self-compacting concrete is between −170 mV and −230 mV.

9. The method of claim 6 , wherein the cement mixture comprising 5% by weight heavy oil ash reduces the corrosion current density of steel in the heavy oil ash self-compacting concrete.

10. The method of claim 1 , wherein the heavy oil ash self-compacting concrete is characterized by a water absorption percentage of between 4.50% and 4.60%.

11. The method of claim 1 , wherein the heavy oil ash self-compacting concrete is substantially free of fly ash or silica fume.

12. The method of claim 1 , wherein the heavy oil ash does not react with calcium hydroxide or lime.

13. The method of claim 1 , wherein the heavy oil ash comprises less than 10% by weight of sulfur, magnesium and vanadium.

14. The method of claim 1 , further comprising adding a second aggregate to the cement mixture following the addition of the first aggregate.

Assignees

• Saudi Arabian Oil Co
• Univ King Fahd Pet & Minerals

Inventors

• Al-Mehthel Mohammed
• Maslehuddin Mohammed
• Al-Dossari Fahad R
• Ali Mohammed Rizwan
• Barry Mohammed Salihu

Classifications

• C04B7/26 Primary

  from raw materials containing flue dust {, i.e. fly ash (C04B7/243 takes precedence)} · CPC title

• C04B18/087 Primary

  from liquid fuels, e.g. oil · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B2111/00103

  Self-compacting mixtures · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title