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Adobe

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Adobe is a versatile building material made from loam and organic materials. The term comes from the Spanish word for mudbrick.

Milyanfan-adobe-bricks-8038
Milyanfan-adobe-bricks-8038

In many parts of the United States, such as the Southwest, adobe refers to specific architectural styles like Pueblo Revival. It is a fundamental material used globally for thousands of years. Adobe architecture has been dated to more than 5,100 years ago. This material is valued because it is simple to manufacture and very economical.

Santa Fe adobe
Santa Fe adobe

Creating an adobe brick is a precise process of mixing and drying. Builders create a composite material by mixing earth with water and organic matter. They often add straw or dung to the mixture. These organic materials act as binders to hold the brick together. They also help the brick dry evenly to prevent cracking from uneven shrinkage. The ideal soil contains about 15% clay, 10–30% silt, and 55–75% fine sand.

Cueva de las Jarillas
Cueva de las Jarillas

To make the bricks, the mud mixture is pressed into an open timber frame. Once the mixture is molded, the wooden frame is removed after the initial setting. The bricks are left to air dry for several hours. After this, they are turned on their edge to finish drying. To prevent cracking, it is often best to let them dry slowly in the shade. Some modern adobe is stabilized by adding up to 10% Portland cement or emulsified asphalt by weight.

Milyanfan-adobe-bricks-8038
Milyanfan-adobe-bricks-8038

The history of the word adobe is remarkably long. It has existed for around 4,000 years with very little change in meaning. The word can be traced back to the Middle Egyptian word ḏbt, which meant mudbrick. This word evolved into Coptic and was later adopted into Arabic. Eventually, it entered Old Spanish, likely through Mozarabic. English speakers borrowed the term from Spanish in the early 18th century.

Qasroddasht
Qasroddasht

Adobe structures possess unique thermodynamic properties that make them ideal for desert climates. These thick walls have a high thermal mass, which means they act as a heat reservoir. During a hot day, the walls absorb heat from the sun and the air through radiation and convection. This process keeps the interior of the building cool. After the sun sets, the walls slowly transfer that stored heat to the inside. This time-lag effect helps moderate temperature fluctuations between day and night.

Djenne great mud mosque
Djenne great mud mosque

While durable in dry climates, adobe has specific structural limitations. Adobe walls are load-bearing, meaning they must carry their own weight into the foundation. Because of this, adobe buildings usually do not rise above two stories. They are also susceptible to damage from earthquakes. Significant damage occurred during the 1976 Guatemala earthquake, the 2003 Bam earthquake, and the 2010 Chile earthquake. To meet building codes, blocks must have a specific compressive strength and a tensile modulus of rupture strength.

Niger, Agadez (50), house repairs, old town
Niger, Agadez (50), house repairs, old town

There are different ways to use earthen materials for construction. One method is making individual bricks to be assembled with adobe mud as a bond. Another method involves pouring or puddling soft adobe in layers. This technique is often called cob. In the Americas, indigenous peoples used these poured methods for thousands of years. It was only after the Spanish arrived that the use of wooden forms to make individual bricks became common.

Fort Saint-Sébastien - Visite des fouilles juin 2012 68
Fort Saint-Sébastien - Visite des fouilles juin 2012 68
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🖼️ Images & Media (10)
File:Adobe wall (detail) 1.jpg
Adobe wall (detail) 1.jpg
File:AdobeSurfaceCoatingRenewalOnWall.jpg
AdobeSurfaceCoatingRenewalOnWall.jpg
File:Qasroddasht.JPG
Qasroddasht.JPG
File:San Pedro de Atacama church.jpg
San Pedro de Atacama church.jpg
File:Santa Fe adobe.jpg
Santa Fe adobe.jpg
File:Djenne great mud mosque.jpg
Djenne great mud mosque.jpg
File:Niger, Agadez (50), house repairs, old town.jpg
Niger, Agadez (50), house repairs, old town.jpg
File:Cueva de las Jarillas.jpg
Cueva de las Jarillas.jpg
File:Milyanfan-adobe-bricks-8038.jpg
Milyanfan-adobe-bricks-8038.jpg
File:Fort Saint-Sébastien - Visite des fouilles juin 2012 68.jpg
Fort Saint-Sébastien - Visite des...
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