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Ultra-high performance concretes having a low cement content

A cement and hydraulic technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as carbon dioxide emissions, and achieve the effect of reducing CO2 emissions

Active Publication Date: 2017-03-01
HOLCIM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But the preparation of cement (especially the preparation of clinker) is responsible for a lot of CO2 emissions

Method used

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  • Ultra-high performance concretes having a low cement content
  • Ultra-high performance concretes having a low cement content
  • Ultra-high performance concretes having a low cement content

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Embodiment

[0127] The invention is described by the following non-limiting examples A, B, C, D, E, F, G, H:

[0128]

[0129]

[0130] The cement was prepared by grinding and isolating Portland cement CEM I, 52.5 NPMES from Lafarge Le Teil Cement Works. This grinding is carried out by using an air jet mill associated with a very efficient separator. The ground cement obtained had a D10 of 1.7 μm, a D50 of 5.3 μm and a D90 of 10.6 μm. Blaine specific surface area is 6,950cm 2 / g and the BET specific surface area is 1.65m 2 / g.

[0131] Le Millisil C6 is a siliceous filler (quartz) from Sibelco. It corresponds to the A1 additive. It has a D10 of 2.9 μm, a D50 of 28.9 μm and a D90 of 95.6 μm.

[0132] Silica fume MST 02 from SEPR is characterized by 12m 2 / g of BET specific surface area.

[0133] Micro A anhydrite is micronized anhydrous calcium sulfate supplied by Maxit. It has a D10 of 1.6 μm, a D50 of 12.3 μm and a D90 of 17.0 μm.

[0134] BE01 sand is siliceous sand supp...

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Abstract

The present invention relates to a hydraulic binder comprising, as percentage by mass: from 17 to 55% of a Portland cement, the particles of which have a D50 of from 2 mum to 11 mum; at least 5% of silica fume; from 36 to 70% of a mineral addition A1, the particles of which have a D50 of from 15 to 150 mum; the sum of these percentages being from 80 to 100%; the sum of the percentages of cement and of silica fume being greater than 28%; the mineral addition A1 being selected from slags, pozzolanic additions or siliceous additions such as quartz, silico-calcareous mineral additions, calcareous additions such as calcium carbonate or mixtures thereof.

Description

technical field [0001] The present invention relates to hydraulic binders and mixtures comprising the same, which enable obtaining ultra-high performance concrete with a low cement content. Background technique [0002] Technological progress in the field of concrete in recent years has led to the development of a hydraulic binder which allows to obtain ultra-high performance (in particular in terms of compressive strength) concrete. These binders usually rely on additional materials other than cement and aggregates, such as fibers, organic admixtures or so-called ultrafine particles. [0003] However, conventional ultra-high performance concrete has a relatively high cement content, typically 700kg cement / m 3 Concrete to 1,000kg cement / m 3 concrete. [0004] But the production of cement (especially the production of clinker) is responsible for large CO2 emissions. In fact, the preparation of clinker requires: [0005] a) preheating and decarburizing the meal obtained b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/52C04B14/06C04B14/28C04B14/30C04B18/14C04B20/00C04B28/04
CPCC04B7/527C04B14/06C04B14/062C04B14/28C04B14/30C04B18/146C04B20/008C04B28/04C04B2201/52Y02W30/91C04B7/52C04B28/14C04B2103/50
Inventor F·图桑G·莫利纳R·巴尔巴鲁洛
Owner HOLCIM
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