Process for manufacturing infrastructures based on vitrified blast-furnace slag and additive used

• US 6,793,851 B1
• Filed: 03/27/2000
• Issued: 09/21/2004
• Est. Priority Date: 04/09/1998
• Status: Expired due to Fees

• Current Assignee: Mecaroute SA
• Original Assignee: Mecaroute SA
• Inventors: Bompay, Jean-Yves, Prunevieille, Jean-Michel
• Primary Examiner(s): Colaianni, Michael
• Assistant Examiner(s): Poe, Michael I.
• Application Number:
  US09/534,987
• Time in Patent Office: 1,639 Days
• Field of Search: 264/31, 404/75, 106/715, 106/735, 106/776, 106/782, 106/791
• US Class Current: 264/31
• CPC Class Codes: C04B 18/141 Slags
• CPC Class Codes: C04B 20/0076 characterised by the grain distribution
• CPC Class Codes: C04B 2111/0075 for road construction
• CPC Class Codes: C04B 2111/60 Flooring materials
• CPC Class Codes: C04B 22/062 of the alkali or alkaline-earth metals
• CPC Class Codes: C04B 22/064 of the alkaline-earth metals
• CPC Class Codes: C04B 22/10 containing carbon in the anion
• CPC Class Codes: C04B 22/143 Calcium-sulfate
• CPC Class Codes: C04B 28/08 Slag cements
• CPC Class Codes: E01C 3/003 characterised by material or composition used, e.g. waste or recycled material E01C3/006, E01C3/04 and E01C3/06 take precedence
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A process for constructing infrastructures, in which aggregates, vitrified blast-furnace slag, a pulverulent activator and water are mixed together, the mix is spread out over the ground, compacted and left to harden, and in which a particulate slag and a ready-prepared additive containing, on the one hand, the activator and, on the other hand, dry ground vitrified slag having a particle size of less than 500 μm are added to the aggregate is provided. Further provided is the additive for the construction of infrastructures according to the said process, which additive includes, on the one hand, a pulverulent activator and, on the other hand, dry ground vitrified slag having a particle size of less than 500 μm.

Claims

1. Process for constructing infrastructures, in which aggregates, vitrified blast-furnace particulate slag, a pulverulent activator and water are mixer together to form a mix, and the mix is spread out over the ground, compacted and left to harden, characterized in that the particulate slag and a ready-prepared additive are added to the aggregates prior to mixing with the water, wherein:

the particulate slag comprises an as-granulated or as-pelletized particulate slag that is not preground and that contains no more than approximately 1% by weight slag fines,

the ready-prepared additive comprises, on the one hand, the activator and, on the other hand, dry ground vitrified slag having a particle size of less than 500 μ

m, and

the mix comprises approximately 0.5 to 2% by weight of slag fines.

2. Process according to claim 1, characterized in that the activator has an average particle size of between 0 and 500 μ

m for at least 95% of its weight and a moisture content of less than 0.5% by weight.

3. Process according claim 1, characterized in that more than 95% by weight of the additive consists of a mixture having the following formulation by weight:

4. Process according claim 1, characterized in that an amount of additive of between 1 and 3% by weight with respect to the total of the mix (aggregates/slag/additive/water) is added to the said mix.

5. Process according to claim 1, characterized in that the dry ground slag has a water content of less than 0.5% by weight.

6. Process according to claim 5, wherein the activator consists, for more than 95% by weight, of lime, calcium sulphate or a mixture of lime and calcium sulphate.

7. Process according to claim 1, characterized in that the activator consists, for more than 95% by weight, of lime, calcium sulphate or a mixture of lime and calcium sulphate.

8. Process according to claim 7, characterized in that the activator contain sodium or potassium hydroxide.

9. Process according to claim 8, wherein the activator as an average particle size of between 0 and 500 μ

m for at least 95% of its weight and a moisture content of less than 0.5% by weight.