Concrete composition

• US 4,026,716 A
• Filed: 06/28/1976
• Issued: 05/31/1977
• Est. Priority Date: 03/17/1975
• Status: Expired due to Term

• Current Assignee: Martin Marietta Magnesia Specialties, LLC
• Original Assignee: Woodville LIME & Chemical Company
• Inventors: Judd, George G., Urschel, George C. III
• Primary Examiner(s): Garvin, Patrick P.
• Assistant Examiner(s): Sheehan, John P.
• Application Number:
  US05/700,508
• Time in Patent Office: 337 Days
• Field of Search: 106/89, 106/97
• US Class Current: 106/738
• CPC Class Codes: C04B 14/26 Carbonates
• CPC Class Codes: C04B 18/16 from building or ceramic industry
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A high compressive strength concrete is disclosed. The concrete is formed by mixing with water a general-use cement, dolomitic limestone as a low-silica manufactured fine aggregate, and from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, and curing the mixture.

Claims

1. A cementitious structural composition consisting essentially of Portland cement, dolomitic limestone as a low-silica manufactured fine aggregate, water and from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, said precipitate having a particle size essentially less than 5 microns.

2. A composition as claimed in claim 1 additionally containing a coarse limestone aggregate.

3. A composition as claimed in claim 1 wherein the precipitate contains from about 34.4 to 38.1 percent by weight calcium, calculated as CaO and from about 25.4 to 36.1 percent by weight magnesium, calculated as MgO.

4. A composition as claimed in claim 2 wherein the precipitate has a calcium content calculated as CaO of about 35 percent by weight and a magnesium content calculated as MgO of about 26 percent by weight.

6. A composition as claimed in claim 1 wherein the manufactured fine aggregate contains 30 percent by weight calcium, calculated as CaO and about 22 percent by weight magnesium, calculated as MgO.

5. A cementitious structural composition consisting of from 11 to 14 percent by weight Portland cement, from about 33.8 to 38.1 percent by weight of dolomitic limestone as a low-silica manufactured fine aggregate, about 46 percent by weight coarse limestone aggregate, from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, said precipitate having a particle sizing of essentially less than 5 microns and sufficient water to form a workable mixture.