Blinding - Revision history

Designing Buildings at 07:57, 20 December 2022

2022-12-20T07:57:13Z

← Older revision		Revision as of 07:57, 20 December 2022
Line 1:		Line 1:
−	~~In construction, 'blinding' typically refers to a base layer of weak concrete or sand that~~ is ~~laid above a layer of hardcore to provide a clean, level and dry working surface.~~	+	= What is blinding in construction? =

−	A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.	+	In construction, 'blinding' typically refers to a base layer of weak concrete or sand that is laid above a layer of hardcore to provide a clean, level and dry working surface. A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.
−		+
−	If a damp-proof membrane (DPM) is to be placed above it, the blinding will help prevent it from becoming damaged by the hardcore. If a damp-proof membrane is not being laid directly above the blinding, the blinding instead provides a sturdy surface on which reinforcement for a concrete floor or raft foundation can be positioned, it prevents the concrete from seeping down into the hardcore, and it reduces the amount of moisture penetrating up into the concrete.	+

	The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.		The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.

−	NB [https://www.ciria.org/ItemDetail?iProductCode=C786F&Category=FREEPUBS Culvert, screen and outfall manual, (CIRIA C786)] published by CIRIA in 2019, ~~defines~~ blinding as: ‘A temporary accumulation of impermeable debris on the lower part of a screen that creates a ‘weir’ effect, reducing the flow area and increasing upstream water levels. Preferred term is variable blockage.’ Where a screen is: ‘An arrangement of bars, grids or poles placed in a watercourse.’	+	= What is blinding for? =
		+
		+	If a damp-proof membrane (DPM) is to be placed above it, the blinding will help prevent it from becoming damaged by the hardcore.
		+
		+	If a damp-proof membrane is not being laid directly above the blinding layer, it provides a sturdy surface on which a pavement, concrete floor, footing, raft foundation or reinforcement can be positioned, and it prevents the concrete from seeping down into the hardcore. It also reduces the amount of moisture penetrating up into the concrete.
		+
		+	A blinding layer can also provide a more useable working surface on construction sites, it creates a cleaner and more even site and provides a suitable ground for the storage of materials.
		+
		+	= Alternative definitions of blinding =
		+
		+	NB [https://www.ciria.org/ItemDetail?iProductCode=C786F&Category=FREEPUBS Culvert, screen and outfall manual, (CIRIA C786)] published by CIRIA in 2019, gives an alternative definition of blinding as: ‘A temporary accumulation of impermeable debris on the lower part of a screen that creates a ‘weir’ effect, reducing the flow area and increasing upstream water levels. Preferred term is variable blockage.’ Where a screen is: ‘An arrangement of bars, grids or poles placed in a watercourse.’

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Aggregates.		* Aggregates.
	* Beam and block.		* Beam and block.
		+	* Concrete.
	* Damp proof course.		* Damp proof course.
	* Damp proof membrane DPM.		* Damp proof membrane DPM.

Designing Buildings at 07:34, 10 September 2020

2020-09-10T07:34:53Z

← Older revision		Revision as of 07:34, 10 September 2020
Line 23:		Line 23:
	* Vapour barrier.		* Vapour barrier.

−	[[Category:~~Construction_techniques~~]] [[Category:~~Products_/_components~~]] [[Category:DCN_Product_Knowledge]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Construction_techniques]] [[Category:Products_/_components]]

Designing Buildings at 12:46, 19 June 2020

2020-06-19T12:46:42Z

← Older revision		Revision as of 12:46, 19 June 2020
Line 1:		Line 1:
−	In construction, blinding is a base layer of weak concrete or sand that is laid above a layer of hardcore to provide a clean, level and dry working surface.	+	In construction, 'blinding' typically refers to a base layer of weak concrete or sand that is laid above a layer of hardcore to provide a clean, level and dry working surface.

	A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.		A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.
Line 6:		Line 6:

	The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.		The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.
		+
		+	NB [https://www.ciria.org/ItemDetail?iProductCode=C786F&Category=FREEPUBS Culvert, screen and outfall manual, (CIRIA C786)] published by CIRIA in 2019, defines blinding as: ‘A temporary accumulation of impermeable debris on the lower part of a screen that creates a ‘weir’ effect, reducing the flow area and increasing upstream water levels. Preferred term is variable blockage.’ Where a screen is: ‘An arrangement of bars, grids or poles placed in a watercourse.’

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =
Line 21:		Line 23:
	* Vapour barrier.		* Vapour barrier.

−	[[Category:Construction_techniques]] [[Category:Products_/_components]]	+	[[Category:Construction_techniques]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Editor at 16:53, 4 February 2019

2019-02-04T16:53:40Z

← Older revision		Revision as of 16:53, 4 February 2019
Line 10:		Line 10:

	* Aggregates.		* Aggregates.
		+	* Beam and block.
	* Damp proof course.		* Damp proof course.
	* Damp proof membrane DPM.		* Damp proof membrane DPM.

Editor at 16:48, 8 October 2018

2018-10-08T16:48:12Z

← Older revision		Revision as of 16:48, 8 October 2018
Line 7:		Line 7:
	The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.		The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Aggregates.		* Aggregates.
Line 18:		Line 16:
	* Hardcore.		* Hardcore.
	* Raft foundation.		* Raft foundation.
		+	* Sand.
	* Types of floor.		* Types of floor.
	* Vapour barrier.		* Vapour barrier.

	[[Category:Construction_techniques]] [[Category:Products_/_components]]		[[Category:Construction_techniques]] [[Category:Products_/_components]]

Designing Buildings at 12:23, 25 January 2018

2018-01-25T12:23:12Z

← Older revision		Revision as of 12:23, 25 January 2018
Line 3:		Line 3:
	A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.		A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.

−	If a damp-proof membrane (DPM) is to be placed above it, the blinding will help prevent it from becoming damaged by the hardcore. If a damp-proof membrane is not being laid directly above the blinding, the blinding instead provides a sturdy surface on which reinforcement for ~~the~~ concrete foundation can be positioned, it prevents the concrete from seeping into the hardcore, and it reduces the amount of moisture penetrating up into the concrete.	+	If a damp-proof membrane (DPM) is to be placed above it, the blinding will help prevent it from becoming damaged by the hardcore. If a damp-proof membrane is not being laid directly above the blinding, the blinding instead provides a sturdy surface on which reinforcement for a concrete floor or raft foundation can be positioned, it prevents the concrete from seeping down into the hardcore, and it reduces the amount of moisture penetrating up into the concrete.

	The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.		The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.

Designing Buildings at 12:17, 25 January 2018

2018-01-25T12:17:22Z

← Older revision		Revision as of 12:17, 25 January 2018
Line 1:		Line 1:
−	In construction, blinding is a base layer of weak concrete ~~and/~~or sand that is ~~cast~~ to provide a clean and dry working surface~~. As a level surface, it can be used for either an underlying mass fill or a concrete slab foundation~~.	+	In construction, blinding is a base layer of weak concrete or sand that is laid above a layer of hardcore to provide a clean, level and dry working surface.

−	A thin layer, usually around 50 mm (2 inches) thick, is poured ~~either~~ over the hardcore ~~or the foundation itself~~, sealing in the underlying material~~. It can even~~ off the surface of the hardcore if a damp-proof membrane (DPM) is to be placed under the concrete bed, and prevent the DPM from being damaged. The blinding layer provides a sturdy surface on which reinforcement for the concrete foundation can be positioned.	+	A thin layer, usually around 50 mm (2 inches) thick, of blinding is poured over the hardcore, sealing in the underlying material and levelling off the surface.

−	As the concrete used for blinding is ~~weaker~~ compared with structural concrete, it can withstand lower ~~pressures and is used for lighter duty construction~~. ~~Steel~~ mats can be used to reinforce either the entire blinding layer or the specific areas of ~~highest static loads~~.	+	If a damp-proof membrane (DPM) is to be placed above it, the blinding will help prevent it from becoming damaged by the hardcore. If a damp-proof membrane is not being laid directly above the blinding, the blinding instead provides a sturdy surface on which reinforcement for the concrete foundation can be positioned, it prevents the concrete from seeping into the hardcore, and it reduces the amount of moisture penetrating up into the concrete.
		+
		+	The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.

	= Find out more =		= Find out more =

Editor: Created page with "In construction, blinding is a base layer of weak concrete and/or sand that is cast to provide a clean and dry working surface. As a level surface, it can be used for either an u..."

2018-01-24T18:00:00Z

Created page with "In construction, blinding is a base layer of weak concrete and/or sand that is cast to provide a clean and dry working surface. As a level surface, it can be used for either an u..."

New page

In construction, blinding is a base layer of weak concrete and/or sand that is cast to provide a clean and dry working surface. As a level surface, it can be used for either an underlying mass fill or a concrete slab foundation.

A thin layer, usually around 50 mm (2 inches) thick, is poured either over the hardcore or the foundation itself, sealing in the underlying material. It can even off the surface of the hardcore if a damp-proof membrane (DPM) is to be placed under the concrete bed, and prevent the DPM from being damaged. The blinding layer provides a sturdy surface on which reinforcement for the concrete foundation can be positioned.

As the concrete used for blinding is weaker compared with structural concrete, it can withstand lower pressures and is used for lighter duty construction. Steel mats can be used to reinforce either the entire blinding layer or the specific areas of highest static loads.

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* Aggregates.
* Damp proof course.
* Damp proof membrane DPM.
* Floor insulation.
* Floor loading.
* Hardcore.
* Raft foundation.
* Types of floor.
* Vapour barrier.

[[Category:Construction_techniques]] [[Category:Products_/_components]]