Silicon - Revision history

Designing Buildings at 14:56, 29 November 2022

2022-11-29T14:56:19Z

← Older revision		Revision as of 14:56, 29 November 2022
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	* Silica is another name for silicon dioxide (SiO2).		* Silica is another name for silicon dioxide (SiO2).

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

		+	* Caulk v silicone sealant.
	* Concrete superplasticizer.		* Concrete superplasticizer.
	* Fabric structures.		* Fabric structures.

Designing Buildings at 08:02, 29 December 2020

2020-12-29T08:02:31Z

← Older revision		Revision as of 08:02, 29 December 2020
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	* [http://www.hse.gov.uk/pubns/cis36.pdf Construction dust.]		* [http://www.hse.gov.uk/pubns/cis36.pdf Construction dust.]

−	[[Category:Theory]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Theory]]

Designing Buildings at 13:02, 3 November 2020

2020-11-03T13:02:17Z

← Older revision		Revision as of 13:02, 3 November 2020
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	* Polycarbonate plastic.		* Polycarbonate plastic.
	* Polymers.		* Polymers.
		+	* Putty.
	* Rubber.		* Rubber.
	* Silica.		* Silica.

Designing Buildings at 08:46, 24 September 2020

2020-09-24T08:46:54Z

← Older revision		Revision as of 08:46, 24 September 2020
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	* Kitchen worktop manufacture, and		* Kitchen worktop manufacture, and
	* Grit and abrasive blasting, particularly on sandstone.		* Grit and abrasive blasting, particularly on sandstone.
		+
		+	For more information see: Silica.

	= Silicon, silicone and silica =		= Silicon, silicone and silica =
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	* Polymers.		* Polymers.
	* Rubber.		* Rubber.
		+	* Silica.
	* Spalling.		* Spalling.
	* The development of structural membranes.		* The development of structural membranes.

Designing Buildings at 15:50, 11 October 2019

2019-10-11T15:50:38Z

← Older revision		Revision as of 15:50, 11 October 2019
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	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =

−	* Alkali-activated binder.
−	* Alkali-aggregate reaction (AAR).
−	* Carbon fibre.
−	* Cement.
−	* Chert.
−	* Cladding.
	* Concrete superplasticizer.		* Concrete superplasticizer.
−	* Concrete.
−	* Curtain wall systems.
	* Fabric structures.		* Fabric structures.
−	* Formwork.
−	* Geodesic dome.
−	* Glass reinforced concrete.
	* Glass.		* Glass.
	* Laitance.		* Laitance.
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	* Plastic.		* Plastic.
	* Polycarbonate plastic.		* Polycarbonate plastic.
−	* ~~Portland cement~~.	+	* Polymers.
		+	* Rubber.
	* Spalling.		* Spalling.
	* The development of structural membranes.		* The development of structural membranes.

Designing Buildings at 15:39, 11 October 2019

2019-10-11T15:39:45Z

← Older revision		Revision as of 15:39, 11 October 2019
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	* Glass.		* Glass.
	* Laitance.		* Laitance.
−	* Modular buildings.
−	* Offsite materials.
	* Plastic cladding.		* Plastic cladding.
	* Plastic.		* Plastic.

Designing Buildings at 08:55, 13 June 2019

2019-06-13T08:55:32Z

← Older revision		Revision as of 08:55, 13 June 2019
Line 45:		Line 45:
	* Kitchen worktop manufacture, and		* Kitchen worktop manufacture, and
	* Grit and abrasive blasting, particularly on sandstone.		* Grit and abrasive blasting, particularly on sandstone.
		+
		+	= Silicon, silicone and silica =

	Differentiating between silicon, silicone and silica		Differentiating between silicon, silicone and silica
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	* Alkali-activated binder.		* Alkali-activated binder.
	* Alkali-aggregate reaction (AAR).		* Alkali-aggregate reaction (AAR).
−	* Alkali-silica reaction
	* Carbon fibre.		* Carbon fibre.
	* Cement.		* Cement.

Designing Buildings at 08:54, 13 June 2019

2019-06-13T08:54:42Z

← Older revision		Revision as of 08:54, 13 June 2019
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	= Introduction =		= Introduction =

−	Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, ~~expressed~~ mainly as silica in sand. Silicates are the chief constituents of many rocks, clays and soils and make up more than 90% of the Earth’s crust.	+	Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, found mainly as silica in sand. Silicates are the chief constituents of many rocks, clays and soils and make up more than 90% of the Earth’s crust.

	Hard and brittle, silicon has a crystalline structure and a metallic blue-grey lustre. Because it is classed as ‘metalloid’, it displays properties of both metals and non-metals.		Hard and brittle, silicon has a crystalline structure and a metallic blue-grey lustre. Because it is classed as ‘metalloid’, it displays properties of both metals and non-metals.
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	Silicon has an affinity for oxygen and so is rarely found in its pure elemental form but as silicon dioxide (SiO2 or silica). Silica occurs in 12 different crystal modifications which include alpha quartz, a main constituent of granite and sandstone, rock crystal, rose quartz, smoky quartz, morion, amethyst and citrine. Also, as agate, onyx, jasper and flint.		Silicon has an affinity for oxygen and so is rarely found in its pure elemental form but as silicon dioxide (SiO2 or silica). Silica occurs in 12 different crystal modifications which include alpha quartz, a main constituent of granite and sandstone, rock crystal, rose quartz, smoky quartz, morion, amethyst and citrine. Also, as agate, onyx, jasper and flint.

−	Commercially, silicon is used mostly without processing in semiconductors, and is essential to integrated circuits. Its high conductivity also sees its use in solar power cells. But its main use is in steel refining, aluminium casting and chemicals. ~~However, silicon~~ of up to 99% purity can be made using an electric arc furnace by reducing quartzite or sand with high-purity coke	+	Commercially, silicon is used mostly without processing in semiconductors, and is essential to integrated circuits. Its high conductivity also sees its use in solar power cells. But its main use is in steel refining, aluminium casting and chemicals. Silicon of up to 99% purity can be made using an electric arc furnace by reducing quartzite or sand with high-purity coke

	= Uses in construction =		= Uses in construction =

−	~~Most~~ construction materials contain silica e.g asphalt, brick, cement, concrete, plasterboard, grout, mortar, tile and stone. It is also used as a filler in some plastics and is added to white ceramic ware such as porcelain and to some types of glass~~, especially traditional and special glass~~	+	Many construction materials contain silica e.g asphalt, brick, cement, concrete, plasterboard, grout, mortar, tile and stone. It is also used as a filler in some plastics and is added to white ceramic ware such as porcelain and to some types of glass.

−	Silicates are used in the production of Portland cement for concrete, mortar and stucco, and also form the basis for the widely used synthetic polymers called silicones. Silicates are also constituents of optical fibres, fibreglass and glass wool for thermal insulation.	+	Silicates are used in the production of Portland cement for concrete, mortar and stucco, and also form the basis for the widely-used synthetic polymers called silicones. Silicates are also constituents of optical fibres, fibreglass and glass wool for thermal insulation.

	Silicon resins are used in the construction industry as additions to coatings to which they impart resistance to heat, oils, salts, acids, and alkalis. Because they also provide water repellence, they are used in water repellent treatments for brickwork and masonry.		Silicon resins are used in the construction industry as additions to coatings to which they impart resistance to heat, oils, salts, acids, and alkalis. Because they also provide water repellence, they are used in water repellent treatments for brickwork and masonry.
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	=== Silicone rubber ===		=== Silicone rubber ===

−	~~Silicon~~ rubber is a synthetic rubber. Compared to natural rubber, it has better resistance to high and low temperatures.	+	Silicone rubber is a synthetic rubber. Compared to natural rubber, it has better resistance to high and low temperatures.

	=== Silicon carbide ===		=== Silicon carbide ===
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	Exposure to silica dust can pose a major health hazard and lead to silicosis of the lung or ‘pneumonoultramicroscopicsilicovolcanoconiosis’. It is a long-term disease usually caused by inhaling large amounts of crystalline silica dust, typically over many years.		Exposure to silica dust can pose a major health hazard and lead to silicosis of the lung or ‘pneumonoultramicroscopicsilicovolcanoconiosis’. It is a long-term disease usually caused by inhaling large amounts of crystalline silica dust, typically over many years.

−	The Health & Safety Executive’s ‘Control of Exposure to Silica Dust’ advises that when cutting, sanding or carving materials containing silica, a fine dust (Respirable ~~crystalline silica~~ (RCS)) is created that may get into the lungs. ~~Unfortunately,~~ RCS is too fine to see under normal lighting conditions.	+	The Health & Safety Executive’s ‘Control of Exposure to Silica Dust’ advises that when cutting, sanding or carving materials containing silica, a fine dust (Respirable Crystalline Silica (RCS)) is created that may get into the lungs. RCS is too fine to see under normal lighting conditions.

	Typical activities that may generate RCS include:		Typical activities that may generate RCS include:

Editor at 15:27, 6 June 2019

2019-06-06T15:27:43Z

← Older revision		Revision as of 15:27, 6 June 2019
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		+	= Introduction =
		+
	Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, expressed mainly as silica in sand. Silicates are the chief constituents of many rocks, clays and soils and make up more than 90% of the Earth’s crust.		Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, expressed mainly as silica in sand. Silicates are the chief constituents of many rocks, clays and soils and make up more than 90% of the Earth’s crust.

Editor: Created page with "Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, expressed mainly as sil..."

2019-06-06T15:27:17Z

Created page with "Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, expressed mainly as sil..."

New page

Silicon (chemical symbol Si) is a naturally occurring, non-metallic element and, after oxygen, is the second most abundant element in the earth’s crust, expressed mainly as silica in sand. Silicates are the chief constituents of many rocks, clays and soils and make up more than 90% of the Earth’s crust.

Hard and brittle, silicon has a crystalline structure and a metallic blue-grey lustre. Because it is classed as ‘metalloid’, it displays properties of both metals and non-metals.

Silicon has an affinity for oxygen and so is rarely found in its pure elemental form but as silicon dioxide (SiO2 or silica). Silica occurs in 12 different crystal modifications which include alpha quartz, a main constituent of granite and sandstone, rock crystal, rose quartz, smoky quartz, morion, amethyst and citrine. Also, as agate, onyx, jasper and flint.

Commercially, silicon is used mostly without processing in semiconductors, and is essential to integrated circuits. Its high conductivity also sees its use in solar power cells. But its main use is in steel refining, aluminium casting and chemicals. However, silicon of up to 99% purity can be made using an electric arc furnace by reducing quartzite or sand with high-purity coke

= Uses in construction =

Most construction materials contain silica e.g asphalt, brick, cement, concrete, plasterboard, grout, mortar, tile and stone. It is also used as a filler in some plastics and is added to white ceramic ware such as porcelain and to some types of glass, especially traditional and special glass

Silicates are used in the production of Portland cement for concrete, mortar and stucco, and also form the basis for the widely used synthetic polymers called silicones. Silicates are also constituents of optical fibres, fibreglass and glass wool for thermal insulation.

Silicon resins are used in the construction industry as additions to coatings to which they impart resistance to heat, oils, salts, acids, and alkalis. Because they also provide water repellence, they are used in water repellent treatments for brickwork and masonry.

Silicon is also added to polishes, mechanical seals, high temperature greases and waxes, caulking compounds, breast implants, contact lenses, explosives and fireworks. Also, to hi-tech abrasives, hi-strength ceramics and in super alloys.

=== Silicone rubber ===

Silicon rubber is a synthetic rubber. Compared to natural rubber, it has better resistance to high and low temperatures.

=== Silicon carbide ===

This is used as an abrasive to smooth a variety of materials. It is formed when carbon and sand (or silica) are heated together in a furnace. It may be marketed under the trade name of ‘carborundum’.

= Silicosis =

Exposure to silica dust can pose a major health hazard and lead to silicosis of the lung or ‘pneumonoultramicroscopicsilicovolcanoconiosis’. It is a long-term disease usually caused by inhaling large amounts of crystalline silica dust, typically over many years.

The Health & Safety Executive’s ‘Control of Exposure to Silica Dust’ advises that when cutting, sanding or carving materials containing silica, a fine dust (Respirable crystalline silica (RCS)) is created that may get into the lungs. Unfortunately, RCS is too fine to see under normal lighting conditions.

Typical activities that may generate RCS include:

* Construction and demolition processes – concrete, stone, brick, mortar;
* Quarrying;
* Slate mining and slate processing;
* Potteries, ceramics, ceramic glaze manufacture, brick and tile manufacture;
* Foundries;
* Refractory production and cutting;
* Concrete product manufacture;
* Monumental and architectural masonry manufacture, stone fireplace and
* Kitchen worktop manufacture, and
* Grit and abrasive blasting, particularly on sandstone.

Differentiating between silicon, silicone and silica

* Silicon is a naturally occurring element
* Silicone is a man-made polymer that is derived from silicon, a class of silicon-based chemical compounds used in paints, adhesives, lubricants and breast implants, among other applications
* Silica is another name for silicon dioxide (SiO2).

= Related articles on Designing Buildings Wiki =

* Alkali-activated binder.
* Alkali-aggregate reaction (AAR).
* Alkali-silica reaction
* Carbon fibre.
* Cement.
* Chert.
* Cladding.
* Concrete superplasticizer.
* Concrete.
* Curtain wall systems.
* Fabric structures.
* Formwork.
* Geodesic dome.
* Glass reinforced concrete.
* Glass.
* Laitance.
* Modular buildings.
* Offsite materials.
* Plastic cladding.
* Plastic.
* Polycarbonate plastic.
* Portland cement.
* Spalling.
* The development of structural membranes.

= External links =

* [http://www.hse.gov.uk/pubns/indg463.pdf Control of exposure to silica dust - a guide for employees.]
* [http://www.hse.gov.uk/pubns/cis36.pdf Construction dust.]

[[Category:Theory]]