Ultra high performance fibre concrete - Revision history

Editor at 20:22, 23 March 2021

2021-03-23T20:22:50Z

← Older revision		Revision as of 20:22, 23 March 2021
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	* Concrete.		* Concrete.
	* Concrete superplasticisers.		* Concrete superplasticisers.
		+	* Earthquake resistant building materials.
	* Efflorescence.		* Efflorescence.
	* Grout.		* Grout.

Designing Buildings at 07:38, 2 March 2021

2021-03-02T07:38:54Z

← Older revision		Revision as of 07:38, 2 March 2021
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	* Plasticiser.		* Plasticiser.

−	[[Category:Publications_/_reports]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Publications_/_reports]]

Designing Buildings: moved Ultra High Performance Fiber Concretes to Ultra high performance fibre concrete

2020-02-04T12:16:48Z

moved Ultra High Performance Fiber Concretes to Ultra high performance fibre concrete

← Older revision

Revision as of 12:16, 4 February 2020

Designing Buildings at 12:16, 4 February 2020

2020-02-04T12:16:18Z

← Older revision		Revision as of 12:16, 4 February 2020
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	Metal fibres are used for structural applications requiring significant mechanical strength.		Metal fibres are used for structural applications requiring significant mechanical strength.
		+
		+	= Related articles on Designing Buildings Wiki =
		+
		+	* Admixtures in concrete.
		+	* Binding agent.
		+	* Blockwork.
		+	* Brick
		+	* Bullseye window.
		+	* Cement.
		+	* Cement mortar.
		+	* Concrete.
		+	* Concrete superplasticisers.
		+	* Efflorescence.
		+	* Grout.
		+	* Hot-mixed mortars: the new lime revival.
		+	* Lime mortar.
		+	* Mortar analysis for specifiers.
		+	* Plasticiser.

	[[Category:Publications_/_reports]]		[[Category:Publications_/_reports]]

Designing Buildings at 12:15, 4 February 2020

2020-02-04T12:15:06Z

Designing Buildings at 12:11, 4 February 2020

2020-02-04T12:11:38Z

← Older revision		Revision as of 12:11, 4 February 2020
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−	Ultra High Performance Fiber Concretes (UHPC) are cementitious matrix materials, reinforced with ~~fibers~~ and offering compressive strengths of between 150 and 250 MPa.	+	Ultra High Performance Fiber Concretes (UHPC) are cementitious matrix materials, reinforced with fibres and offering compressive strengths of between 150 and 250 MPa.

−	Advances in the field of admixtures, formulation methods and the use of ultrafine have led to a ~~spectacular evolution~~ of concretes.	+	Advances in the field of admixtures, formulation methods and the use of ultrafine have led to a revolution of concretes. The range has expanded: from standard concretes with compressive strengths of 30 mpa to high performance concretes (bhp: more than 50 mpa) and very high performance (bthp: more than 80 mpa). A technological breakthrough occurred in the early 1990s with the development of concrete whose resistance exceeds 150 mpa.

−	The range has expanded: from standard concretes with compressive strengths of 30 mpa to high performance concretes (bhp: more than 50 mpa) and very high performance (bthp: more than 80 mpa). A technological breakthrough occurred in the early 1990s with the development of concrete whose resistance exceeds 150 mpa.	+	Their formulation uses superplasticising adjuvants and specific granular compositions as well as fibres (metal or organic fibres). For structural bfup the presence of fibres and tensile performance lead to pseudo-ductile behaviour to overcome all or part of passive frames.
−		+
−	Their formulation uses ~~superplasticizing~~ adjuvants and specific granular compositions as well as ~~fibers~~ (metal or organic ~~fibers~~). For structural bfup the presence of ~~fibers~~ and tensile performance lead to pseudo-ductile ~~behavior~~ to overcome all or part of passive frames.	+

	These concretes revolutionize the techniques and methods of construction and allow the design of new structures.		These concretes revolutionize the techniques and methods of construction and allow the design of new structures.
Line 11:		Line 9:
	These concretes offer exceptional performances:		These concretes offer exceptional performances:

−	A very ~~great~~ workability,~~<br />~~	+	* A very good workability,
−	~~A very important compactness<br />~~	+	* Compactness
−	Low permeability~~<br />~~	+	* Low permeability
−	Characteristic compressive strengths at ~~very high~~ 28 days (for structural bfups) between 150 and 250 mpa,~~<br />~~	+	* Characteristic compressive strengths at 28 days (for structural bfups) between 150 and 250 mpa,
−	~~Mechanical~~ resistance~~, at a young age, very high,<br />~~	+	* Early high mechanical resistance.
−	Exceptional durability (which allows them to be used in very aggressive environments)~~,<br />~~	+	* Exceptional durability (which allows them to be used in very aggressive environments).
−	Ductility (deformability under load without brittle fracture) ~~important,<br />~~	+	* Ductility (deformability under load without brittle fracture).
−	High tenacity (resistance to micro-cracking)~~,<br />~~	+	* High tenacity (resistance to micro-cracking).
−	Very low desiccation shrinkage and creep~~,<br />~~	+	* Very low desiccation shrinkage and creep.
−	~~A very important surface~~ hardness~~,<br />~~	+	* Surface hardness.
−	High resistance to abrasion and shock~~,<br />~~	+	* High resistance to abrasion and shock.
−	~~Aspects of~~ particularly aesthetic facing and very fine facing textures~~,<br />~~	+	* A particularly aesthetic facing and very fine facing textures.
−	~~They make it possible to optimize the maintenance and maintenance costs of the structures and new constructive perspectives~~.	+

−	~~First~~ companies that ~~had~~ used UHPFC ~~are~~ in France, and ~~are [https://www.edf.fr/~~ EDF], ~~[https://www.eiffage.com/~~ Eiffage], ~~[https://structalis.fr~~ Structalis], and ~~[https://www.bouygues.com/en/~~ Bouygues].	+	The first companies that used UHPFC were in France, and were EDF, Eiffage, Structalis, and Bouygues.

−	The evolution of UHPCs compared to high performance concretes (BHP) is ~~characterized~~ by:~~<br />~~	+	The evolution of UHPCs compared to high performance concretes (BHP) is characteris ed by:
−	~~Their great resistance in compression but also in traction,<br />~~	+
−	~~Their specific composition and their high dosage in cement (700 to 1000 kg / m3) and in adjuvants,<br />~~	+
−	~~Their specific granular skeleton (4 to 5 grain scales) and the optimization of their granular stacking,<br />~~	+
−	~~The use of aggregates of small dimensions and being the subject of a particular selection,<br />~~	+
−	~~A much lower water content,<br />~~	+
−	~~The presence of fibers (at a high rate).<br />~~	+
−	~~The UHPC may in particular be associated with prestressing by pre-tensioning or post-tensioning, more rarely with passive reinforcement.~~	+

−	The various formulations of the UHPFs make it possible to give them additional properties adapted to the specific requirements of the projects.	+	* Their great resistance in compression but also in traction,
		+	* Their specific composition and their high dosage in cement (700 to 1000 kg / m3) and in adjuvants,
		+	* Their specific granular skeleton (4 to 5 grain scales) and the optimization of their granular stacking,
		+	* The use of aggregates of small dimensions and being the subject of a particular selection,
		+	* A much lower water content,
		+	* The presence of fibers (at a high rate).
		+	* The UHPC may in particular be associated with prestressing by pre-tensioning or post-tensioning, more rarely with passive reinforcement.
		+	* The various formulations of the UHPFs make it possible to give them additional properties adapted to the specific requirements of the projects.

	<br />		<br />

Jean at 07:10, 3 September 2019

2019-09-03T07:10:30Z

← Older revision		Revision as of 07:10, 3 September 2019
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	Aspects of particularly aesthetic facing and very fine facing textures,<br />		Aspects of particularly aesthetic facing and very fine facing textures,<br />
	They make it possible to optimize the maintenance and maintenance costs of the structures and new constructive perspectives.		They make it possible to optimize the maintenance and maintenance costs of the structures and new constructive perspectives.
		+
		+	First companies that had used UHPFC are in France, and are [https://www.edf.fr/ EDF], [https://www.eiffage.com/ Eiffage], [https://structalis.fr Structalis], and [https://www.bouygues.com/en/ Bouygues].

	The evolution of UHPCs compared to high performance concretes (BHP) is characterized by:<br />		The evolution of UHPCs compared to high performance concretes (BHP) is characterized by:<br />

Jean: Created page with "Ultra High Performance Fiber Concretes (UHPC) are cementitious matrix materials, reinforced with fibers and offering compressive strengths of between 150 and 250 MPa. Advances i..."

2019-09-03T07:06:58Z

Created page with "Ultra High Performance Fiber Concretes (UHPC) are cementitious matrix materials, reinforced with fibers and offering compressive strengths of between 150 and 250 MPa. Advances i..."

New page

Ultra High Performance Fiber Concretes (UHPC) are cementitious matrix materials, reinforced with fibers and offering compressive strengths of between 150 and 250 MPa.

Advances in the field of admixtures, formulation methods and the use of ultrafine have led to a spectacular evolution of concretes.

The range has expanded: from standard concretes with compressive strengths of 30 mpa to high performance concretes (bhp: more than 50 mpa) and very high performance (bthp: more than 80 mpa). A technological breakthrough occurred in the early 1990s with the development of concrete whose resistance exceeds 150 mpa.

Their formulation uses superplasticizing adjuvants and specific granular compositions as well as fibers (metal or organic fibers). For structural bfup the presence of fibers and tensile performance lead to pseudo-ductile behavior to overcome all or part of passive frames.

These concretes revolutionize the techniques and methods of construction and allow the design of new structures.

These concretes offer exceptional performances:

A very great workability, 
A very important compactness 
Low permeability 
Characteristic compressive strengths at very high 28 days (for structural bfups) between 150 and 250 mpa, 
Mechanical resistance, at a young age, very high, 
Exceptional durability (which allows them to be used in very aggressive environments), 
Ductility (deformability under load without brittle fracture) important, 
High tenacity (resistance to micro-cracking), 
Very low desiccation shrinkage and creep, 
A very important surface hardness, 
High resistance to abrasion and shock, 
Aspects of particularly aesthetic facing and very fine facing textures, 
They make it possible to optimize the maintenance and maintenance costs of the structures and new constructive perspectives.

The evolution of UHPCs compared to high performance concretes (BHP) is characterized by: 
Their great resistance in compression but also in traction, 
Their specific composition and their high dosage in cement (700 to 1000 kg / m3) and in adjuvants, 
Their specific granular skeleton (4 to 5 grain scales) and the optimization of their granular stacking, 
The use of aggregates of small dimensions and being the subject of a particular selection, 
A much lower water content, 
The presence of fibers (at a high rate). 
The UHPC may in particular be associated with prestressing by pre-tensioning or post-tensioning, more rarely with passive reinforcement.

The various formulations of the UHPFs make it possible to give them additional properties adapted to the specific requirements of the projects.

 
Principles of formulation of UHPCs 
Obtaining high resistances and low permeabilities to aggressive agents requires a very significant reduction in porosity and more specifically in the network of connected pores, by acting on two parameters.

Extremely low water content, thanks to the optimized use of superplasticizers which deflocculate the cement grains (e / c ratio of 0.15 to 0.25)

Maximum compactness, obtained using components corresponding to several granular classes (typically four to five which include cement, ultrafine, fillers and sand). The size and quantity of larger grains are considerably reduced (maximum diameter ranging from 1 to 7 mm, aggregates being specially selected). The optimization of the granular stack makes it possible to reduce the volume of the voids.

The bfup thus have a very low capillary porosity. Ultrafine used in UHPCs are generally silica fumes that fill the intergranular spaces, optimizing the compactness of the material, and react thanks to their pozzolanic power with the lime resulting from the hydration of the cement. They improve the rheology of fresh concrete, actively participate in the resistance of the whole and close the network of pores to the diffusion of ions and gases. Other ultrafine can also be used such as calcareous or siliceous microfillers and natural or artificial pozzolans.

The use of adjuvants, such as water-reducing plasticizers and superplasticizers, makes it possible to formulate bfups with a very low equivalent eeff / binder ratio.

Fibers, a key component of UHPCs, give the material its ductility. These fibers have a length adapted to the size of the larger grain and a weak section. They generally have a diameter of 0.1 to 0.3 mm and a length of 10 to 20 mm.

The metal fibers are used for structural applications requiring significant mechanical strength.

[[Category:Publications_/_reports]]

← Older revision		Revision as of 12:15, 4 February 2020
Line 26:		Line 26:
	The evolution of UHPCs compared to high performance concretes (BHP) is characteris ed by:		The evolution of UHPCs compared to high performance concretes (BHP) is characteris ed by:

−	* Their great resistance in compression ~~but also~~ in traction,	+	* Their great resistance in compression and in traction.
−	* Their specific composition and their high dosage in cement (700 to 1000 kg / m3) and in adjuvants,	+	* Their specific composition and their high dosage in cement (700 to 1000 kg / m3) and in adjuvants.
−	* Their specific granular skeleton (4 to 5 grain scales) and the ~~optimization~~ of their granular stacking,	+	* Their specific granular skeleton (4 to 5 grain scales) and the optimisation of their granular stacking.
−	* The use of aggregates of small dimensions ~~and being the subject of a particular selection,~~	+	* The use of aggregates of small dimensions.
−	* A much lower water content,	+	* A much lower water content.
−	* The presence of ~~fibers~~ (at a high rate).	+	* The presence of fibres (at a high rate).
−	* The UHPC may ~~in particular~~ be associated with prestressing by pre-tensioning or post-tensioning, more rarely with passive reinforcement.	+	* The UHPC may be associated with prestressing by pre-tensioning or post-tensioning, more rarely with passive reinforcement.
	* The various formulations of the UHPFs make it possible to give them additional properties adapted to the specific requirements of the projects.		* The various formulations of the UHPFs make it possible to give them additional properties adapted to the specific requirements of the projects.

−	~~<br />~~
−	~~Principles of formulation of UHPCs<br />~~
	Obtaining high resistances and low permeabilities to aggressive agents requires a very significant reduction in porosity and more specifically in the network of connected pores, by acting on two parameters.		Obtaining high resistances and low permeabilities to aggressive agents requires a very significant reduction in porosity and more specifically in the network of connected pores, by acting on two parameters.

−	Extremely low water content, thanks to the ~~optimized~~ use of ~~superplasticizers~~ which deflocculate the cement grains (e / c ratio of 0.15 to 0.25)	+	Extremely low water content, thanks to the optimised use of superplasticisers which deflocculate the cement grains (e / c ratio of 0.15 to 0.25).

−	Maximum compactness, obtained using components corresponding to several granular classes (typically four to five which include cement, ultrafine, fillers and sand). The size and quantity of larger grains are considerably reduced (maximum diameter ranging from 1 to 7 mm, aggregates being specially selected). The ~~optimization~~ of the granular stack makes it possible to reduce the volume of the voids.	+	Maximum compactness, obtained using components corresponding to several granular classes (typically four to five which include cement, ultrafine, fillers and sand). The size and quantity of larger grains are considerably reduced (maximum diameter ranging from 1 to 7 mm, aggregates being specially selected). The optimisation of the granular stack makes it possible to reduce the volume of the voids.

−	The bfup thus have a very low capillary porosity. Ultrafine used in UHPCs are generally silica fumes that fill the intergranular spaces, ~~optimizing~~ the compactness of the material, and react thanks to their pozzolanic power with the lime resulting from the hydration of the cement. They improve the rheology of fresh concrete, actively participate in the resistance of the whole and close the network of pores to the diffusion of ions and gases. Other ultrafine can also be used such as calcareous or siliceous microfillers and natural or artificial pozzolans.	+	The bfup thus have a very low capillary porosity. Ultrafine used in UHPCs are generally silica fumes that fill the intergranular spaces, optimising the compactness of the material, and react thanks to their pozzolanic power with the lime resulting from the hydration of the cement. They improve the rheology of fresh concrete, actively participate in the resistance of the whole and close the network of pores to the diffusion of ions and gases. Other ultrafine can also be used such as calcareous or siliceous microfillers and natural or artificial pozzolans.

−	The use of adjuvants, such as water-reducing ~~plasticizers~~ and ~~superplasticizers~~, makes it possible to formulate bfups with a very low equivalent eeff / binder ratio.	+	The use of adjuvants, such as water-reducing plasticisers and superplasticisers, makes it possible to formulate bfups with a very low equivalent eeff / binder ratio.

−	~~Fibers~~, a key component of UHPCs, give the material its ductility. These ~~fibers~~ have a length adapted to the size of the larger grain and a weak section. They generally have a diameter of 0.1 to 0.3 mm and a length of 10 to 20 mm.	+	Fibres, a key component of UHPCs, give the material its ductility. These fibres have a length adapted to the size of the larger grain and a weak section. They generally have a diameter of 0.1 to 0.3 mm and a length of 10 to 20 mm.

−	~~The metal fibers~~ are used for structural applications requiring significant mechanical strength.	+	Metal fibres are used for structural applications requiring significant mechanical strength.

	[[Category:Publications_/_reports]]		[[Category:Publications_/_reports]]