METHOD FOR PRODUCING AGGREGATES FROM CEMENT COMPOSITIONS

• US 20140296370A1
• Filed: 12/16/2011
• Published: 10/02/2014
• Est. Priority Date: 12/21/2010
• Status: Active Grant

• Current Assignee: Mapei SPA (Emme Esse Vi Srl)
• Original Assignee: Mapei SPA (Emme Esse Vi Srl)
• Inventors: Ferrari, Giorgio, Surico, Francesco, Squinzi, Marco, Brocchi, Alberto, Banfi, Emanuele, Maltese, Cristiano
• Granted Patent: US 9,216,925 B2
• Time in Patent Office: Days
• US Class Current: 523/122
• CPC Class Codes: C04B 12/04 Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate cements alkali metal silicates per se, their preparation C01B33/32; ammonium silicates per se, their preparation C01C1/00
• CPC Class Codes: C04B 18/02 Agglomerated materials , e.g. artificial aggregates
• CPC Class Codes: C04B 18/021 agglomerated by a mineral binder, e.g. cement
• CPC Class Codes: C04B 18/16 from building or ceramic industry
• CPC Class Codes: C04B 2103/0051 Water-absorbing polymers, hydrophilic polymers
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A method for producing aggregates from fresh cement compositions, included concrete and residual concrete is disclosed, comprising the addition of a) flash setting accelerators and b) super-absorbent polymers to fresh unset cement compositions and blending this mixture until granular materials are formed.

Claims

1. Method for producing aggregates from fresh cement compositions, included concrete and residual concrete, said method comprising

adding a) flash setting accelerators and b) super-absorbent polymers to fresh unset cement compositions and

blending this mixture until granular materials are formed.

2. Method according to claim 1 wherein flash setting accelerators are selected from sodium silicate or substances forming calcium aluminate hydrates.

3. Method according to claim 2, wherein the substances forming calcium aluminate hydrates are independently selected from calcium aluminate, aluminum sulphate, sodium aluminate, alumina cement or mixtures thereof.

4. Method according to claim 1, wherein the flash setting accelerator is in the range from 0.3 to 50 kg/m³ of concrete.

5. Method according to claim 1, wherein the super-absorbent polymer is in the range from 0.05 to 10 kg/m³ of concrete.

6. Method according to claim 1, wherein the flash setting accelerators and the super-absorbent polymers are added separately or blended as a single product.

7. Method according to claim 1, further comprising supplementary ingredients added, separately or in combination, including cement and concrete accelerating agents, activating agents for the formation of aluminate hydrates, retarding agents, waterproofing and water repellant agents, efflorescence inhibitors, slags, natural pozzolanas, silica fume, fly ashes, silica sand, calcium carbonate, pigments and coloring agents, clays, porous hollow glass, herbicides, pesticides, fertilizers, plastic and rubber materials.

8. Method according to claim 1 where the granular material is further treated in a rotating plate.

9. Granular materials produced by the method of claim 1.

10. Method for making road-bed materials, aggregate for concrete, street and garden furniture, substitute for natural stones and lightweight aggregates with the granular material of claim 9.