Lafarge

Paris, France
Paris, France

Lafarge is a French industrial company specialising in four major products: cement, construction aggregates, concrete and gypsum wallboard. In 2010 the company was the world's second-largest cement manufacturer by mass shipped behind Holcim. Wikipedia.

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Patent
Lafarge | Date: 2017-04-12

The invention concerns a method for producing a mineral foam comprising the following steps: (i) independently preparing a cement slurry and an aqueous foam, the cement slurry being prepared by mixing water E and cement C, the cement C comprising a soluble equivalent quantity x of Na2O, x being expressed by weight for 100 parts cement, said slurry having a ratio x / (E/C) less than or equal to 1,75, E/C being expressed by weight, and the particles of cement C having a size distribution such that the particle size distribution ratio dmax(h/2)/dmin(h/2) is between 5 and 25; (ii) bringing the cement slurry into contact with the aqueous foam in order to obtain a foamed cement slurry; and (iii) shaping the foamed cement slurry obtained in step (ii) and allowing setting to take place.


The invention relates to concrete with a smooth surface, coated completely or partially with a polymer film obtained by means of radiation-induced polymerisation, said film in turn being coated completely or partially with a thin photovoltaic film.


The present invention relates to a hydraulic binder containing, in wt%: - 20% to 82% Portland cement, the particles of which have a D50 from 2 m to 11 m; - 15% to 56% of a non-pozzolanic mineral additive A1, the particles of which have a D50 from 1 m to 150 m, said additive being selected from limestone additives such as calcium carbonate, silica additives such as quartz, silica/limestone mineral additives, calcined shales, zeolites, burnt plant ash, and the mixtures thereof; and - 4% to 30% of a pozzolanic mineral additive A2, the particles of which have a D50 between 1 and 150 m. The sum of said percentages is between 90% and 100%.


Patent
Lafarge | Date: 2017-04-26

The invention relates to a novel non-self-levelling, ultra-high performance hydraulic composition that can be used to produce concrete parts in a single step, regardless of the shape or cross-section of the part and without requiring an assembly step.


Patent
Lafarge | Date: 2017-06-07

A process for the production of a mineral foam comprising the following steps:(i) separately preparing a slurry of cement and an aqueous foam, wherein the cement slurry comprises water (W) and Portland cement (C);(ii) contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement;(iii) adding a magnesium salt source in step (i) or before, during or after step (ii);(iv) casting the slurry of foamed cement and leave it to set.


Patent
Lafarge | Date: 2017-06-07

A process for the production of a mineral foam comprising the following steps:(i) separately preparing a slurry of cement and an aqueous foam, wherein the cement slurry comprises water (W) and Portland cement (C) as well as CSH crystallization seeds;(ii) contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement;(iii) casting the slurry of foamed cement and leave it to set.


Patent
Lafarge | Date: 2017-06-07

A process for the production of a mineral foam comprising the following steps:(i) separately preparing a slurry of cement and an aqueous foam, wherein the cement slurry comprises water (W) and Portland cement (C);(ii) contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement;(iii) adding an aluminium salt source before, during or after step (ii);(iv) casting the slurry of foamed cement and leave it to set.


Patent
Lafarge | Date: 2017-06-14

The present invention relates to a method for treatment of a pozzolanic material, comprising a step of bringing the pozzolanic material into contact with an inorganic compound able to release a cation in solution, the mixture of the pozzolanic material and the inorganic compound comprising 1 to 15% water by mass, and the bringing of the pozzolanic material into contact with the mineral compound being performed over a period of at least 1 hour before the use of the treated pozzolanic material.


Patent
Lafarge | Date: 2017-02-01

The invention relates to a hydraulic binder comprising a belite sulfoaluminate clinker and silica having a BET specific surface area in nitrogen of at least 50 m/g, the quantity of silica being lower than or equal to 5%, said percentage being expressed as a mass percentage in relation to the mass of the binder.


The invention relates to a method for producing an insulating composite block comprising a mineral foam, said method comprising the following steps: a. providing a block comprising at least one cell having walls which are either sufficiently humid or consist of a water-repellent material, and b. filling said cell with a mineral foam that does not substantially comprise any calcium aluminate. The invention also relates to an insulating composite block comprising a block, said block comprising at least one cell having walls optionally comprising a water-repellent material, said cell being filled with a mineral foam that does not substantially comprise any calcium aluminate.

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