Rice straw: Straw gives Cob its tensile strength-the ability to move and bend without breaking and to withstand ground movement and shear forces (Michael, 2000). Remembering all of this shorthand can be tricky, especially when this is added to the challenge of reading all the symbols and deciphering the conventions that might be used by a particular draftsperson or designer. Production of Cob: The production of cob involved three stages. Get the top COB abbreviation related to Engineering. For part 1, 36 specimens were prepared, 12 of which were axially unconfined compression tested immediately after preparation to determine their initial wet strengths, the other 24 were allowed to air dry in the laboratory 12 of which were unconfined compression tested (and loaded in excess of that of failure to help clarify the failure mode). Building with cob is a labour-intensive process, which may begin with shovelling or stamping together the cob mixture in foundation courses. While the term English term "cob" was first recorded in Cornwall in 1602, mud and straw construction has been used worldwide in a variety of forms under a variety of names.… cob definition: 1. the hard cylinder-shaped part of the maize plant on which the yellow or white grain grows: 2. a…. I do not know what breathable render they used to seal the roof. Guidance from the Government for the construction sector. The tests were carried out in conformation with the procedures on ASTM and British Standard specification. Sometimes just doing one of these things can be enough to help. Think of cob building as house sculpting. COC - Code of Conduct. The foundation must be wider than the wall, typically by around 300 mm, and sufficiently deep for the load requirements. content and an increase in straw content. Straw is an annually renewable crop, available wherever grain crops are grown. Creating a cob house often creates a very healthy home for air quality. The Cob Cottage Company is now offering hands-on cob construction workshops in most parts of North America. No forms are used, allowing the builder to create any shape desired. Cob, also known as cobb, is a building material that comprises subsoil, straw (or another fibrous organic material), water, and occasionally lime. Close. Cob, also known as cobb, is a building material that comprises subsoil, straw (or another fibrous organic material), water, and occasionally lime. Soil sample was obtained from a site in front of the Federal polytechnic Ado-Ekiti, in Nigeria. Straw and water are added and the cob is mixed by hand … Projecting domestic and commercial environmental trends. A look behind the Government's green industrial revolution. Due to the locality in which the study was conducted and the comparatively availability of rice in most areas, it was most reasonable to use rice straw for this testing programme. The main variables for the sets of specimen were the initial moisture content at which the specimens were prepared and the straw content. engineering, building. The tests on Cob were divided into three parts. A straw content of about 1.0 to 1.5% is probably optimal when all of the above factors are considered. Under normal conditions, the topsoil removed from the footprint of the building is enough to supply all construction needs. Cob construction has been around for over a thousand years and continues to be popular and practical. Pushing the boundaries of the creative process. The oldest cob house still standing is 10,000 years old. Cob is Mixed into a dough like consistency, and then placed onto the walls up to two foot thick and worked in to create a monolithic wall structure. COB. Cob is an ancient technique of building, which is a combination of sand and clay, mixed with straw and water. | Meaning, pronunciation, translations and examples This is partly due to no allowances for densities Below a moisture content of about Part 3 consists of 4 pairs of specimens with straw content 0, 0.6, 2 and 3%, respectively. Cob construction can save money, resources and time … For example, traditional English cob, which was used up until the 1800s when it began to be replaced by more modern construction methods, was a mixture of clay-based subsoil, sand, straw and water. This strength is probably sufficient In the present study, the aggregate fraction is that fraction of the matrix material with an effective diameter greater than 0.002 mm; the binder fraction has an effective diameter less than 0.002 mm. 2. COC - Certificate of Compliance. Building can consist entirely or partially of soil, depending on the location, climate, available skills, cost and use of the building. Cob - Unburned clay mixed with straw. engineering, building. Adoption comes during organisation's annual general meeting. Learn more. I initially (and still are) an excited follower of Rammed Earth for many of the same reasons you are interested in your cob construction and ran into the same issues here in the Midwest. Most of straw is derived from crops like rice, barley and wheat while much smaller amount are derived from oaths, maize, oilseed, rape and field beans (Jenkins et al., 1998). Enrich your vocabulary with the English Definition dictionary Cob walls are laid in courses, each one being left to completely dry before the next one is laid. So if your work time is, i.e. business, finance, engineering. In 1993, along with Ianto Evans and Linda Smiley, he started the Cob Cottage Company, a research and teaching group focused on reviving and improving traditional forms of earthen construction. Yes your cob style construction has issues or should we say the location and climate thereof does but this is the mother of invention or ingenuity. The rice straw used was obtained from a hilltop in a farm in Aare-Ekiti, Ekiti State in Nigeria where the threshing of the rice from the straw has taken place. easy guideline for suitability is the plasticity index (PI). Let’s have a look at some of the highlighting advantages of building a cob house. 'College Of Business' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource. The full length of it means “close of business” and it represents the time when you are supposed to go home from work. Since the material used for cob house construction is locally sourced, it is a dirt-cheap method of building a dwelling which will last for years. The plastic index and the plastic limit results for the soil are 23.8 and 40.5%, respectively. COB is an abbreviation used in business to emphasize the time in which something should be done. The mixes that contained the most straw and required the most water to provide a suitable mix tended to shrink the most. As the specimens were of similar initial dimensions, the actual water losses have been provided to provide a comparison. Cob-builders are not getting a consumer product instantly off the shelf. The study determined some of the engineering properties of cob for its suitability as building material. The binder fraction of the material used in this work consisted substantially of clay minerals. You can find out about our cookies and how to disable cookies in our Privacy Policy. Cob is highly resistant to weathering, because of its porous nature; it can withstand long periods of rain without weakening (Keefe et al., 2001). As can be seen from the Fig. As there is a slow food movement, so cob belongs to the slow build movement. However each of these could vary by +/-10% and still acceptable. The soil sample used was obtained from a site in front of the Federal polytechnic Ado-Ekiti, in Nigeria. Acronym for Close of Business. from 9:00 to 17:00 hours, that means COB is 17:00. In the construction of Cob, the straw of a grain producing plant is used. It also provides excellent thermal insulation, generally exceeding minimum U-values for domestic buildings. In areas where there is large temperature variation (arid zones or highlands) the walls and roof are probably thicker than in more uniform climates (humid zones), where the need for material of high thermal capacity is less (Houben and Hurbert, 1984; Trott, 1994). The Atterberg limit graph of the sample is shown in Fig. cob wall "A wall formed of unburnt clay mixed with chopped straw, gravel, and occasionally with layers of long straw, in which the straw acts as a bond"- Dictionary of Architecture and Construction, Cyril M. Harris, ed., McGraw- Hill, 1975, p. 111. CoCC - Committee on Climate Change. Usually referring to a 5:00PM deadline. Generally when the proportion of the Due to its vasality and widespread availability, earth has been used as building material on every continent from age to age. A typical soil of cob is likely to contain about 30% gravel, 35% sand and 35% strength (Agarwal, 1981; Saxton, 1995). The word cob comes from an Old English root meaning "a lump or rounded mass". In climates that benefit by some insulation, cob’s sister, strawbale construction, can be an excellent choice. The one area you’ll need to spend some attention on is moisture levels. Construction blueprints, also called construction plans or drawings, are full of abbreviations and acronyms to save space and neaten the overall appearance of the presentation. Close of Business. It is one of many methods for building with raw earth. One of the advantages of using cob is that the walls can be built up to any shape required, making it very flexible in terms of design. Find out what is the full meaning of COB on Abbreviations.com! COB. This is the moisture Here are 9 tips for getting building approval for your cob house construction. COB: Central Obrera Boliviana (Bolivian labor organization) CoB: Council of Bureaux (International Association of National Motor Insurers' Bureaux) COB: Community of Believers (various organizations) COB: City of Brownsville (Texas) COB: Contingency Operating Base: COB: Conan O'Brien (TV personality) COB: Chamber Orchestra of Boston (Massachusetts) COB The general trend is an increase in strength due to a reduction in moisture They were air dried for 28 days and frequent weight and size measurements were taken. WHAT IS THE MEANING OF COB AND EOD? Cob is labour intensive, but it is extremely satisfying. and the inclusion of weak specimens made too dry and lacking adequate bond. It can add-on, cut-out, or reshape anytime, even after the cob is dry. Traditionally, thick walls (approximately 60 cm) have provided good thermal mass, which retains heat in cold seasons and keeps the interior cool in hot seasons. Cob building has experienced something of a revival in recent years as a form of sustainable construction. between the coarse particles and the strength will then depend more on the moisture The binder fraction of the material used during the tests consisted substantially of clay minerals therefore binder fraction will be used to refer to these clay minerals. If vertical cracks develop, cob or clay tiles can be used to fix them before moisture penetration risks damaging the wall. Cob is a very old method of building with earth and straw or other fibers. Engineering COB abbreviation meaning defined here. In the UK we ensure our cob houses last for hundreds of years by incorporating a few basic design features that make them suitable for our climate. Clay soils require the addition of more sand than do silty soils, but the overall quantities of sand and straw needed for a modest cob building are surprisingly small. ; What does COB mean? At least 200 mm overhang is typical. The moisture content at which shrinkage ceased in relation to straw content, for the part 1 and 3 specimens are given in Fig. Because the mud mixture is porous, cob can withstand long periods of rain without weakening. Cob is fire-proof, resistant to seismic activity, and tends to be inexpensive, albeit time-consuming. BSRIA report compares green building ratings. Depending on the contents of the subsoil, sand or clay can be added to achieve the best possible mixture for building. The word cob comes from an old English root meaning a lump or rounded mass. If too much straw is added, the extra water needed also leads to increased volume changes during drying however the straw reduces the size of cracks. Traditional English Cob Home HISTORY OF COB CONSTRUCTION Cob construction is one of the oldest building techniques that even pre-dates the humble mud brick. The present study looks into some properties of Cob as a building material. The basic ingredients of cob are soil, sand and straw. https://scialert.net/abstract/?doi=jas.2006.1882.1885, Indentation due to concentrated force on cob. Earth construction takes many forms, including adobe, cob, rammed earth, straw-clay and wattle-and-daub. Earth constructions are found in all parts of the world, though to a lesser extent in areas of extreme rainfall, generally, Cob houses are suitable for the desert or for very cold climates. content range from liquid limit (LL) to the plastic limit (PL). Cob construction is attractive to many, due to its sculptural possibilities. content. Typically contemporary cob has beautiful curvilinear walls and many sculptural details. At Cob Cottage Company we have found that many visitors have similar questions about cob. The rice straw is usually the golden brown color and it is the part of the plant actually carrying the rice grain. What does COB stand for in Engineering? How Do You Make Cob?. Looking for the definition of COB? Cob Houses Are Healthy. Meaning, you don’t have to check off every one of these tips to get your approval. Cob as a building material is very easy to find, which makes it a practical option. COC - Certificate of Conformance/Conformity CoC - Chain of Custody. 10.7% similar to the shrinkage limit, all strength were greater than 600 KN If you continue to use this website without disabling cookies, we will assume you are happy to receive them. 2. Cob is strong, durable and cob houses should stand forever as long as their roof is maintained and the property is looked after properly. Cob is easy to learn and inexpensive to build. Cob definition: A cob is a round loaf of bread. Cob building - Designing Buildings Wiki - Share your construction industry knowledge. The higher the straw content, the higher the strain at failure due to loadings, this was observed during the testing of the specimens. Sieve analysis: The sieve analysis results is presented in Table 1, the results shows that the mixture contains good percentage of coarse aggregates, more than 50%, while percentage silt and clay is also more than 15%, this is still acceptable, however the plastic index will also be used to further determine its suitability. It is one of the oldest building materials on the planet (Steve, 1997). cob meaning: 1. a strong horse with short legs 2. a male swan 3. a small round loaf of bread. And sand may be used to windproof the exterior walls from wind damage (,. Examples at cob Cottage Company we have found that many visitors have similar questions cob. Learn and inexpensive to build is one of these tips can apply different. 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