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Title:
LEIGHTENED CEMENT-BASED EXTRUDABLE COMPOSITE MATERIAL AND PROCESS FOR THE MANUFACTURING OF LEIGHTENED CEMENT-BASED ELEMENTS
Document Type and Number:
WIPO Patent Application WO/2017/029688
Kind Code:
A4
Abstract:
The present invention concerns a cement-based extrudable composite material obtained by trapping gas bubbles in a cement hybrid matrix in turn obtained by mixing cement and/or lime and water, together with a gel obtained from starch gelatinized with water and addition of acetic acid and calcium oxide and/or calcium hydroxide and/or hydrated lime; said gas being inert with respect to the components of said cement hybrid matrix.

Inventors:
GUGLIANDOLO Ernesto (Via Consolare Pompea 48, - MESSINA, 98121, IT)
Application Number:
IT2016/000197
Publication Date:
February 23, 2017
Filing Date:
August 19, 2016
Export Citation:
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Assignee:
GUGLIANDOLO Ernesto (Via Consolare Pompea 48, - MESSINA, 98121, IT)
International Classes:
B28B3/20; B28C5/12; C04B24/38; C04B28/02; C08L3/04
Attorney, Agent or Firm:
IANNONE, Carlo Luigi (Barzanò & Zanardo Roma S.p.A, Via Piemonte, 26 - ROMA, 00187, IT)
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Claims:
AMENDED CLAIMS

received by the International Bureau on 20 APR 2017 (20.04.2017)

1) Cement-based extrudable composite material obtained by trapping gas bubbles in a cement hybrid matrix in turn obtained by mixing cement and/or lime and water, together with a gel obtained from starch gelatinized with water and additionally comprising acetic acid and calcium oxide and/or calcium hydroxide; said gas being inert with respect to the components of said cement hybrid matrix.

2) Composite material according to claim 1, characterised in that the amount of cement and/or lime within said cement hybrid matrix, expressed as a function of the amount of gel, ranges from 1 to 5 times by weight, but preferably from 2 to 4 times by weight and more preferably is equal to 2,5 times the weight of the gel.

3) Composite material according to claim 1 or 2, characterised in that the amount of cement mixing water within said cement hybrid matrix is comprised between 0,2 and 0,5 times the weight of the cement.

4) Composite material according to any of the preceding claims, characterised in that the amount of acetic acid within the gel, expressed as a function of the amount of cement and/or lime within said cement hybrid matrix, is comprised between 0,010 and 0,25 times but preferably between 0,1 and 0,2 times the weight of the dry cement.

5) Composite material according to any of the preceding claims, characterised in that the amount of said calcium oxide or calcium hydroxide within the gel, expressed in relation to the amount of acetic acid, Is comprised between 0,5 and 3 times the weight of the acetic acid and preferably between 2 and 2, 5 times the weight of the acetic acid.

6) Composite material according to any of the preceding claims, characterised in that it additionally comprises sorbitol or glycerol.

7) Composite material according to any of the preceding claims, characterised in that said starch is selected amongst rice starch, com starch, wheat starch, potato starch, wheat starch.

8) Process for the manufacturing of the composite material defined according to claims 1-7, characterised in that it comprises the following steps: - preparing a first mixture comprising starch, acetic acid, water and calcium oxide or calcium hydroxide;

- heating the first mixture up to the starch phase transition temperature, preferably up to 9Q°C, maintaining constant the temperature until the completion of the phase transition,

- preparing a second mixture, comprising cement and/or lime and water,

- preparing a foam of bubbles of an inert gas with respect to the remaining components of said composite material, preferably air, in an aqueous solution, by Insufflation of gas in the presence of a surfactant,

- lowering the temperature of said first mixture down to 35-45'C, preferably down to 40°C and mixing said first mixture together with said second mixture,

- progressively dispensing said foam in the mixture obtained.

9) Leightened cement-based element obtainable by extrusion of the composite material defined according to claims 1-7.

10) Leightened cement-based element according to claim 9, characterised in that said extrusion occurs with values of pressure thrust between 0,5 and 6 bar.

11) Leightened cement-based element according to claim 9 or 10, characterised In that, in case said leightened cement-based element is obtained from a composite material comprising a plasticlzer, said leightened cement-based element is coated with a plastlcised coating layer.

12) Leightened cement-based element according to any of claims 9-11 , characterised in that it consists of two or more superimposed and coupled extruded elements.




 
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