Singlesized coarse aggregates are surrounded and held together by a thin layer of. This form of lightweight concrete is generally a crushed rock or gravel of 20 mm single size aggregate 1020 coated in a cement slurry with no fine aggregate addition. View and download powerpoint presentations on concrete and masonry safety ppt. Ppt concrete structures powerpoint presentation free to.
Because of these great differences in rate of shri n k a g e, care must be taken when using combined no fines and dense concrete constru c t i o n. No fines concrete is literally that concrete made without fine aggregate so it has high permeability and drainage capacity. No fines concrete is a combination of coarse aggregate, cement, and water. The most widespread applications of no fines concrete include road paving, and surface treatments to permit water drainage. Here you can download the free lecture notes of concrete technology pdf notes ct pdf notes with multiple file links to download. Find powerpoint presentations and slides using the power of, find free presentations research about concrete and masonry safety ppt. The nofines concrete consists of cement, coarse aggregate and water. Authors in 5 experimented on the use of no fines concrete as a building material and determined strength, durability properties of no fines concrete and checked corrosion protection of the. No fine concrete has been in use in many countries over more than a century. The strength of no fines concrete increases as the cement content is increased. Fiber reinforced concrete can be defined as a composite material consisting of mixtures of cement, mortar or concrete and discontinuous, discrete, uniformly dispersed suitable fibers. It has been used in europe and the united kingdom since the 1930s for the building of single story and multistory dwellings, but had found little acceptance in north america. No fines concrete is a material containing graded coarse aggregate, generally of a single as sieve size, bonded together by a paste of cement and water sufficient to provide adequate strength while producing an opentextured cellular concrete with a high volume of voids and high permeability. Nofine concrete has been in use in many countries over more than a century.
The no fines voided concrete without sand construction technique for buildings is not particularly suited to drilling of holes to provide adequate fixings. Allan block retaining walls and nofines concrete no problem. Concrete structures introduction to design methods in reinforced concrete sustainable construction is concrete green. Plus, youll learn how to clip and save individual slides from online presentations. The properties of the coarse aggregate must comply with table r81. Creating a firm anchor in nofines wall for hanging boiler. Advantages, limitations and mix proportions of no fines concrete is discussed. Because of these great differences in rate of shri n k a g e, care must be taken when using combined nofines and denseconcrete constru c t i o n. No fines concrete is a concrete mix having no fine aggregate of sand in it. A 12 inch diameter pipe with a weight of at least 30 pounds per foot is recommended.
We also provide stepbystep details on how to download slideshare ppt presentations for free. Thenternatjonajournaof cemen t composites and lightweight concrete, volume 8, number 7 february 1986 compactibility of no fines concrete moayed n. Applicability of nofines concrete as a road pavement page i abstract considerable research has been conducted on environmentally sustainable development. The compressive strength of nofines concrete is considerably lower than that of conventional portland cement concrete and varies between 200 to 2000 psi 1. Hardened concrete will have no footprints on it if walked on. Six passes of the pipe are sufficient to compact the no fines concrete to level. However, numerous site constraints did not allow enough clearance to install geogrid reinforcement within the property limits. The srw industry expects to see geogrid lengths equal to at least 60% of the total height of the wall. Boral no fines permeable concrete, when placed correctly, absorbs rainwater and facilitates natural runoff into the ground or storage tanks. Applicability of nofines concrete as a road pavement.
Possibilities in concrete structure a free powerpoint ppt presentation displayed as a flash slide show on id. The water to cement ratio for no fines concrete should range between 0. Although nofines concrete was used as early as the nineteen twenties, its possibilities were not fully investigated until the shortages of the postwar period stimulated interest in forms of construction which economised in building materials. No fines concrete allows the building of block retaining walls in areas and conditions where normal construction methods may not work it may be applied to areas where excavation behind a wall is limited. Mineral products association mpa is the trade association for aggregates, asphalt, cement, concrete, dimension stone, lime, mortar and silica sand industries. The size of these voids should be large enough to avoid the movement of moisture in the concrete section by capillary action. May 05, 2015 no fines concrete is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge. No fines concrete normally is not used in reinforced concrete. No fines concrete exhibiting porous characteristic because of containing only coarse aggregates is a permeable concrete that allows runoff water to settle down to ground allowing groundwater recharge. Walls made from this type of concrete are plastered on both sides to prevent air drafts. Our aim is to enable all those involved in the design, use and performance of concrete and masonry to realise the potential of these materials.
Fine aggregates generally consist of natural sand or crushed stone with most particles passing through a 9. No fine concrete also called porous concrete, permeable concrete, and porous. Dec 23, 2016 as nofines concrete doesnt segregate, it can be dropped from a considerable height and placed in very high lifts. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. The coarse aggregate should preferably be a singlesize material nominal maximum sizes 10mm and 20mm being the most common. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The coarse aggregate may be any of the usual type or the light weight aggregate. The quantity of cementitious material is approximately 297 kgm. As the name indicates, this a concrete mix without fine aggregate ie without sand.
Investigation of strength and workability in nofines concrete ijert. The wimpey no fines house was a construction method and series of house designs produced by the george wimpey company and intended for massproduction of social housing for families, developed under the ministry of works postworld war ii emergency factory made programme. As nofines concrete has little or no cohesion in the fresh state, it requires long time for the removal of forms. It is formed by eliminating the fine material from the regular concrete mix. Woodland heights, a 30unit townhome association built in the 1980s, needed to replace its second timber retaining wall. All too often, an owner will opt for a cast in place cip wall or a big block wall over using a traditional. Very often only single sized coarse aggregate, of size passing through 20 mm retained on 10mm is used.
However, in a number of these situations, srws can still be the most effective solution when used in conjunction with no fines concrete nfc. Investigations on some properties of no fines concrete t abadjieva and p sephiri department of civil engineering university of botswana private bag 0061 gaborone, botswana abstract no fines concrete is a form of lightweight porous concrete, obtained by eliminating the sand from the normal concrete mix. No fines concrete subbase roads and maritime services. No fines concrete is one type of light weight concrete.
Research paper investigation of nofines concrete in building. Nofines concrete backfill can be used with any of the allan block retaining wall collections. As the name suggests, no fines concrete is simply the concrete in which fines or fine aggregate is absent and omitted intentionally. Knocking through wimpey no fines in situ concrete house. Search thousands of mfrs and suppliers of steel, cement, construction equipment, construction materials and related to construction industry. The concrete pipe market 2016 report explores concrete pipe industry policy and plan, product specification, manufacturing process, cost structure etc.
However if it is essential to use no fines concrete in reinforced concrete, then the reinforcement has to be coated with a thin layer of about 3 mm of cement paste to improve its bond and prevent corrosion. The name concrete comes from the latin word concretus meaning compact or condensed. Stevenson no fines concrete is a specially designed concrete with a specified void content that allows large volumes of water to quickly fill the voids between the aggregate particles. No fines concrete is used mainly for erecting cast or largeblock exterior walls of buildings in regions rich in local gravel or rock for crushed rock in the absence of other inexpensive wall materials. A 10inch nofines wall, re n d e r ed externally and plast e r ed intern a l l y, has a heat transmission value of 0. No fines concrete is used to reinforced retaining walls where space is limited. Through the strength of no fines concrete is lower than ordinary concrete, the strength are sufficient for use in structural members and load. How to download ppt files from slideshare online for free. Pdf some properties of nofines concrete produced by using. No fines concrete usually used for both load bearing and nonload bearing for external walls and partitions.
The properties of hardened concrete are strength and durability. The quantity of cementitious material is approximately 500 lbyd. This concrete is a mixture of cement, corse aggregate and with or without sand. It is essential that no fines concrete should be designed with a certain amount of voids to enhance thermal insulation. The principal advantages claimed for no fines concrete are economy in materials, somewhat higher thermal insulating values, lower shrinkage, and lower unit weight. Special concrete in todays modern world of concrete, performance parameters are no longer solely restricted to the materials 28 day compressive strength. The cement shall comply with the requirements for use in readymix concrete astm c94.
Pervious concrete also called porous concrete, permeable concrete, no fines concrete and porous pavement is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge. Applicability of no fines concrete as a road pavement page i abstract considerable research has been conducted on environmentally sustainable development. Concrete powerpoint templates w concretethemed backgrounds. It has good drainage properties due to its open texture. Plus youll get a link to a free powerpoint template with every. How the presentation downloads varies depending on the browser youre using. Some properties of nofines concrete produced by using demolished concrete as recycled. Nofines concrete is a concrete containing little or no fine aggregate. Its higher porosity helps in percolating rain water directly to ground and thereby helps in recharging groundwater aquifer. No fines concrete is a lightweight concrete made up of only coarse aggregate, cement and water by omitting fines sand or fine aggregates from normal concrete. Basically no fines concrete consists of coarse aggregates and cement without any fine aggregates. Nofines concrete is a concrete containing little or no fine. Fiber reinforced concrete are of different types and properties with many advantages.
This concrete is tested for its properties, such as slump value, porosity and compressive strength. A 10inch no fines wall, re n d e r ed externally and plast e r ed intern a l l y, has a heat transmission value of 0. But, im not happy trying to screw it back onto the no fines wall. No fines concrete backfill can be used with any of the allan block retaining wall collections. Compaction and surface finishing are best executed semimanually by rolling a steel pipe over the spread mix.
Pervious concrete is known as no fines, gap graded or porous concrete. No fines concrete no fines concrete may be defined as concrete mixtures containing little or no fine aggregate. Nofines concrete is not suitable for use in reinforced concrete. A moisture content of between 6 and 7 percent meets this requirement. Including polypropylene fibers in the pervious concrete mix resulted in significant.
Preparation of porous concrete lightweight concrete obtained by inserting gas bubbles or air into the mixture of plastic cement mixed with fine sand lightweight concrete did not contain stones included as porous mortar. No fines concrete is, as the name indicates, concrete consisting of coarse aggregate, cement and water fines being omitted entirely. No fines refers to the type of concrete used concrete with no fine. The water reacts with the cement, which bonds the other components. Following are the however the limitations of the nofines concrete. Concrete solidifies and hardens after mixing with water and placement due to a chemical process known as hydration. By omitting the sand from the concrete no fines concrete. Better insulating characteristics than conventional concrete because of the presence of large voids. This has lead to the use of no fines concrete in place of conventional concrete and asphalt surfaces. Ppt pervious concrete powerpoint presentation free to.
Concrete that is sloppy or wet may be easy to place but will be more difficult to finish. Yousifl synopsis compressive strength and density of no fines concrete mixes are shown to be dependent on the method and degree of compaction. It can also minimise saturation of the storm water network, reducing the risk. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Nofines concrete article about nofines concrete by the. No fines concrete, also known as porous, pervious, permeable and cellular concrete, is a porous concrete obtained when fine aggregate is omitted. No fines concrete, as the name implies, is simply a concrete product that doesnt contain sand or fine materials. Specifications for using nofines concrete with modular. The compressive strength of no fines concrete is considerably lower than that of conventional portland cement concrete and varies between 200 to 2000 psi 1.
Nfc is used to greatly increase gravity wall heights while maintaining a minimal excavation depth. Its now off the wall, but it needs putting back up again. No fines concrete is obtained by omitting fine aggregate fraction from the conventional concrete. One of the biggest challenges faced by the segmental retaining wall srw industry is maximizing usable space while minimizing cost.
Designing with no fines concrete and ab walls design software. Fiber reinforced concrete types, properties and advantages. This type of concrete consists of only water, cement and coarse aggregate. Water used in the production of concrete must be free from materials harmful to concrete, and be. The concrete technology notes pdf ct notes pdf book starts with the topics covering portland cement, mineral and chemical admixtures, classification of aggregate, factors affecting workability, water cement.
Investigations on some properties of nofines concrete. Beyond strength and durability, there may be other properties of concrete that are desirable on any given project. No fines concrete is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge. Removal and replacement of no fines concrete subbase. The use of no fines concrete is an effective alternative to that of traditional geogrid reinforced structures. Making of no fines concrete the paste content should be just sufficient to thoroughly coat each aggregate particle. Thus the fine aggregate or sand is eliminated and such concrete has been adopted for castinsitu external load bearing walls of single and multistorey houses, small retaining walls. No fines concrete backfill typically consists of cement, fly ash, water and coarse aggregate. The major disadvantages are its low compressive, flexural, and bond strength, and higher permeability.
Nofines concrete backfill typically consists of cement, fly ash, water and coarse aggregate. Concrete technology notes pdf ct notes pdf eduhub sw. Hardening state after concrete has set it begins to gain strength and harden. Nofines concrete consists solely of normal portland cement, water and coarse aggregate. So the walls are basically a solid mass of grey concrete full of pebbles like a giant rice crispies cake. It can also minimise saturation of the storm water network, reducing the risk of flooding in heavy rain events. Their relation with voids ratio and cement content on the basis of particle sizes of course. The house is a wimpey no fines which was built using shuttering and poured in situ concrete, which consists of only concrete and aggregate with no sand hence the name no fines. Retaining solutions no fines concrete gravity walls. Nov 05, 20 pervious concrete is known as no fines, gap graded or porous concrete. It is known that the interfaces are the weakest link in concrete, playing a very important role in the process of. Continuous meshes, woven fabrics and long wires or rods are not considered. No fines concrete is literally thatconcrete made without fine aggregate so it has high permeability and drainage capacity. The base coat of rendered walls generally has a good bond to the no fines concrete.
It is not uncommon to have a site where traditional geogrid reinforced sections will not work. This solution is also advantageous when walls between 1. Provides free draining pavements for light traffic. No fines concrete when conventional aggregate are used, no fines concrete show a density of about 1600 to 2000 kg m3.
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