Chert - Revision history

Designing Buildings at 08:19, 27 December 2020

2020-12-27T08:19:01Z

← Older revision		Revision as of 08:19, 27 December 2020
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	* Patio stone.		* Patio stone.

−	[[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 08:27, 9 July 2018

2018-07-09T08:27:28Z

← Older revision		Revision as of 08:27, 9 July 2018
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−	Chert is a type of fine-grained and silica-rich sedimentary rock. It ~~can~~ often ~~contain~~ microfossils and/or macrofossils, and can be found in a great variety of ~~different~~ colours. It is often confused with flint which is a particular type of chert.	+	Chert is a type of fine-grained and silica-rich sedimentary rock. It often contains microfossils and/or macrofossils, and can be found in a great variety of colours. It is often confused with flint which is a particular type of chert.

−	Chert occurs in geology as nodules, concretionary masses and layered deposits, and is characterised by its hardness and conchoidal fractures that create sharp edges. It was these properties that meant chert was used in early human civilisations for ~~the purposes of~~ creating tools and weapons.	+	Chert occurs in geology as nodules, concretionary masses and layered deposits, and is characterised by its hardness and conchoidal fractures that create sharp edges. It was these properties that meant chert was used in early human civilisations for creating tools and weapons.

−	Chert is often used as an aggregate and as a material for road surfacing. It is particularly suited ~~for~~ road surfacing ~~since~~ rainwater firms and compacts it ~~instead of becoming overly~~ muddy like other fill materials.	+	Chert is often used as an aggregate and as a material for road surfacing. It is particularly suited to road surfacing as rainwater firms and compacts it rather than making it 'muddy' like some other fill materials.

−	However, when used as an aggregate in concrete ~~it can lead to problems~~, such as the development of surface pop-outs ~~when concrete experiences~~ freezing and thawing. This is due to the high porosity of weathered chert. In addition, some kinds of chert, when they come into contact with high-alkali cement~~, can undergo an alkali-silica reaction (ASR)~~ which can lead to ~~the concrete~~ cracking ~~and expanding~~.	+	However, there can be problems when is used as an aggregate in concrete, such as the development of surface pop-outs as a result of freezing and thawing. This is due to the high porosity of weathered chert. In addition, some kinds of chert can undergo an alkali-silica reaction (ASR) when they come into contact with high-alkali cement which can lead to cracking or expansion.

	= Find out more =		= Find out more =
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	* Patio stone.		* Patio stone.

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

Editor at 15:21, 4 July 2018

2018-07-04T15:21:04Z

← Older revision		Revision as of 15:21, 4 July 2018
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	* Aggregates.		* Aggregates.
	* Alkali-silica reaction (ASR).		* Alkali-silica reaction (ASR).
		+	* Bulk filling materials.
		+	* Clay.
	* Concrete.		* Concrete.
	* Construction materials.		* Construction materials.

Editor: Created page with "Chert is a type of fine-grained and silica-rich sedimentary rock. It can often contain microfossils and/or macrofossils, and can be found in a great variety of different colours...."

2018-07-04T15:18:05Z

Created page with "Chert is a type of fine-grained and silica-rich sedimentary rock. It can often contain microfossils and/or macrofossils, and can be found in a great variety of different colours...."

New page

Chert is a type of fine-grained and silica-rich sedimentary rock. It can often contain microfossils and/or macrofossils, and can be found in a great variety of different colours. It is often confused with flint which is a particular type of chert.

Chert occurs in geology as nodules, concretionary masses and layered deposits, and is characterised by its hardness and conchoidal fractures that create sharp edges. It was these properties that meant chert was used in early human civilisations for the purposes of creating tools and weapons.

Chert is often used as an aggregate and as a material for road surfacing. It is particularly suited for road surfacing since rainwater firms and compacts it instead of becoming overly muddy like other fill materials.

However, when used as an aggregate in concrete it can lead to problems, such as the development of surface pop-outs when concrete experiences freezing and thawing. This is due to the high porosity of weathered chert. In addition, some kinds of chert, when they come into contact with high-alkali cement, can undergo an alkali-silica reaction (ASR) which can lead to the concrete cracking and expanding.

= Find out more =

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

* Aggregates.
* Alkali-silica reaction (ASR).
* Concrete.
* Construction materials.
* Defects in stonework.
* Gravel.
* Gravel v hardcore v aggregates.
* Masonry.
* Natural stone.
* Patio stone.

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