High alumina cement - Revision history

Editor: Reverted edits by 212.219.46.130 (talk) to last revision by 106.223.217.194

2021-11-25T11:00:34Z

Reverted edits by 212.219.46.130 (talk) to last revision by 106.223.217.194

← Older revision		Revision as of 11:00, 25 November 2021
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−	~~beep beep~~ High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite (Special clay having extremely high alumina content).	+	High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite (Special clay having extremely high alumina content).

	HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.		HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.

212.219.46.130 at 10:59, 25 November 2021

2021-11-25T10:59:28Z

← Older revision		Revision as of 10:59, 25 November 2021
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−	High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite (Special clay having extremely high alumina content).	+	beep beep High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite (Special clay having extremely high alumina content).

	HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.		HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.

106.223.217.194 at 15:25, 29 December 2020

2020-12-29T15:25:46Z

← Older revision		Revision as of 15:25, 29 December 2020
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−	High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite.	+	High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite (Special clay having extremely high alumina content).

	HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.		HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.

106.223.217.194 at 15:22, 29 December 2020

2020-12-29T15:22:42Z

← Older revision		Revision as of 15:22, 29 December 2020
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	High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite.		High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite.

−	HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely ~~was~~ used in structural concrete such as pre-cast beams.	+	HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely used in structural concrete such as pre-cast beams.

	However, HAC was prone to a crystalline re-arrangement (or ‘conversion’), which could result in reduced strength and also vulnerability to chemical attack when exposed to water for long periods (perhaps as a result of poor detailing or poor manufacturing). This resulted in five high-profile structural failures of roof beams (where the presence of water is more likely) during the 1970s.		However, HAC was prone to a crystalline re-arrangement (or ‘conversion’), which could result in reduced strength and also vulnerability to chemical attack when exposed to water for long periods (perhaps as a result of poor detailing or poor manufacturing). This resulted in five high-profile structural failures of roof beams (where the presence of water is more likely) during the 1970s.

Designing Buildings at 09:58, 9 September 2020

2020-09-09T09:58:53Z

← Older revision		Revision as of 09:58, 9 September 2020
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	* [http://www.brebookshop.com/details.jsp?id=140304 Building Regulations Advisory Committee (BRAC) rules].		* [http://www.brebookshop.com/details.jsp?id=140304 Building Regulations Advisory Committee (BRAC) rules].

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

Designing Buildings at 14:01, 8 May 2019

2019-05-08T14:01:34Z

← Older revision		Revision as of 14:01, 8 May 2019
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	* Screed.		* Screed.
	* Sustainable materials.		* Sustainable materials.
		+	* Types of cement.

	= External references =		= External references =
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	* [http://www.brebookshop.com/details.jsp?id=140304 Building Regulations Advisory Committee (BRAC) rules].		* [http://www.brebookshop.com/details.jsp?id=140304 Building Regulations Advisory Committee (BRAC) rules].

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

88.108.204.181 at 18:28, 11 March 2019

2019-03-11T18:28:26Z

← Older revision		Revision as of 18:28, 11 March 2019
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	* Sustainable materials.		* Sustainable materials.

−	=== External references~~. ==~~=	+	= External references =

	* [http://www.brebookshop.com/details.jsp?id=140304 Building Regulations Advisory Committee (BRAC) rules].		* [http://www.brebookshop.com/details.jsp?id=140304 Building Regulations Advisory Committee (BRAC) rules].

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

Editor at 13:20, 25 September 2018

2018-09-25T13:20:23Z

← Older revision		Revision as of 13:20, 25 September 2018
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−	High Alumina Cement (HAC, sometimes known as calcium aluminate cement (CAC) or aluminous cement) is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite.	+	High Alumina Cement (HAC), sometimes known as calcium aluminate cement (CAC) or aluminous cement, is composed of calcium aluminates, unlike Portland cement which is composed of calcium silicates. It is manufactured from limestone or chalk and bauxite.

−	~~High Alumina Cement~~ was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the ~~1950’s~~, ~~60’s~~ and ~~70’s~~, as it developed strength rapidly and so was relatively fast to manufacture. It was widely was used in structural concrete such as pre-cast beams.	+	HAC was first developed by Lafarge, the cement producer, and became available in the UK in 1925. It was used in particular for marine applications where it was considered to be resistant to chemical attack. It became popular in the 1950s, 60s and 70s, as it developed strength rapidly and so was relatively fast to manufacture. It was widely was used in structural concrete such as pre-cast beams.

−	However, ~~High Alumina Cement~~ was prone to a crystalline re-arrangement (or ‘conversion’), which could result in reduced strength and also vulnerability to chemical attack when exposed to water for long periods (perhaps as a result of poor detailing or poor manufacturing). This resulted in ~~a 5~~ high-profile structural failures of roof beams (where the presence of water is more likely) during the ~~1970’s~~.	+	However, HAC was prone to a crystalline re-arrangement (or ‘conversion’), which could result in reduced strength and also vulnerability to chemical attack when exposed to water for long periods (perhaps as a result of poor detailing or poor manufacturing). This resulted in five high-profile structural failures of roof beams (where the presence of water is more likely) during the 1970s.

	In 1975, MP for Sutton and Cheam, Neil Macfarlane, said “Those words—or the abbreviation "HAC"—are rapidly and relentlessly becoming a combination of misery, apprehension, worry and fear for thousands of people in the United Kingdom.”		In 1975, MP for Sutton and Cheam, Neil Macfarlane, said “Those words—or the abbreviation "HAC"—are rapidly and relentlessly becoming a combination of misery, apprehension, worry and fear for thousands of people in the United Kingdom.”

−	~~High Alumina Cement~~ is no longer used in structural concrete in the UK, although it is still prevalent in buildings constructed in the ~~50’s~~ and ~~60’s~~, and continues to be used for non-structural uses under the name Calcium Aluminate Cement (CAC).	+	HAC is no longer used in structural concrete in the UK, although it is still prevalent in buildings constructed in the 50s and 60s, and continues to be used for non-structural uses under the name Calcium Aluminate Cement (CAC).

	In 1975, The Department of the Environment (DOE) Building Regulations Advisory Committee (BRAC) published guidance for design-check procedures for High Alumina Cement. Commonly known as the [http://www.brebookshop.com/details.jsp?id=140304 BRAC rules], this guidance remains the best advice available and continues to be used to assess the structural performance of buildings containing pre-cast HAC concrete beams.		In 1975, The Department of the Environment (DOE) Building Regulations Advisory Committee (BRAC) published guidance for design-check procedures for High Alumina Cement. Commonly known as the [http://www.brebookshop.com/details.jsp?id=140304 BRAC rules], this guidance remains the best advice available and continues to be used to assess the structural performance of buildings containing pre-cast HAC concrete beams.
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	It should be noted that many buildings that contain HAC components are entirely problem free, and the problems that have occurred have been traced back to manufacturing faults. However, If the presence of HAC is suspected, testing should be carried out, and if it is confirmed, HAC components should be assessed for strength and long-term durability. This is likely to require expert advice.		It should be noted that many buildings that contain HAC components are entirely problem free, and the problems that have occurred have been traced back to manufacturing faults. However, If the presence of HAC is suspected, testing should be carried out, and if it is confirmed, HAC components should be assessed for strength and long-term durability. This is likely to require expert advice.

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

	* Aggregate.		* Aggregate.

Editor at 16:25, 20 September 2017

2017-09-20T16:25:55Z

← Older revision		Revision as of 16:25, 20 September 2017
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	* Ferro-cement.		* Ferro-cement.
	* Hempcrete.		* Hempcrete.
		+	* How scientists solved the riddle of cement’s structure.
	* Lime mortar.		* Lime mortar.
	* Portland cement.		* Portland cement.

Editor at 18:10, 30 May 2017

2017-05-30T18:10:13Z

← Older revision		Revision as of 18:10, 30 May 2017
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	* Deleterious materials.		* Deleterious materials.
	* Demolition.		* Demolition.
		+	* Ferro-cement.
	* Hempcrete.		* Hempcrete.
	* Lime mortar.		* Lime mortar.